


                  Windows Standard Serial Communications

                           Library for C/C++

                                 (WSC4C)


                            REFERENCE MANUAL



                               Version 2.4

                               May 17, 1999




                     This software is provided as-is.
              There are no warranties, expressed or implied.




                         Copyright (C) 1996-1999
                           All rights reserved



                       MarshallSoft Computing, Inc.
                           Post Office Box 4543
                           Huntsville AL 35815

                           Voice : 256-881-4630
                             FAX : 256-880-0925
                           email : info@marshallsoft.com
                             web : www.marshallsoft.com


                               _______
                          ____|__     |                (R)
                       --+       |    +-------------------
                         |   ____|__  |  Association of
                         |  |       |_|  Shareware
                         |__|   o   |    Professionals
                       --+--+   |   +---------------------
                            |___|___|    MEMBER









     WSC4C Reference Manual                                    Page 1

                            C O N T E N T S



        Chapter                                     Page

        Table of Contents.............................2

        WSC Functions.................................4

           SioBaud....................................4
           SioBrkSig..................................4
           SioCTS.....................................5
           SioDCD.....................................5
           SioDone....................................6
           SioDSR.....................................6
           SioDTR.....................................7
           SioEvent...................................7
           SioFlow....................................8
           SioGetc....................................8
           SioGets....................................9
           SioInfo....................................9
           SioParms..................................10
           SioPutc...................................10
           SioPuts...................................11
           SioRead...................................11
           SioReset..................................12
           SioRI.....................................12
           SioRTS....................................13
           SioRxClear................................13
           SioRxQue..................................14
           SioStatus.................................14
           SioTimer..................................15
           SioTxClear................................15
           SioTxQue..................................16
           SioUnGetc.................................16
           SioWinError...............................17

        WSC Error Codes..............................17



















     WSC4C Reference Manual                                    Page 2

                            C O N T E N T S

                              (continued)



        Chapter                                     Page

        Modem I/O Functions..........................18

           mioBreak..................................18
           mioDriver.................................18
           mioQuiet..................................19
           mioResult.................................19
           mioSendTo.................................20
           mioWaitFor................................20

        XYDRIVER Functions...........................21

           xyAbort...................................21
           xyAcquire.................................21
           xyDebug...................................22
           xyDriver..................................22
           xyGetFileName.............................23
           xyGetMessage..............................23
           xyGetParameter............................24
           xyRelease.................................24
           xySetParameter............................25
           xyStartRx.................................25
           xyStartTx.................................26

        XYDRIVER Error Codes.........................26


























     WSC4C Reference Manual                                    Page 3

      +-------------+-----------------------------------------------------+
      |   SioBaud   |  Sets the baud rate.                                |
      +-------------+-----------------------------------------------------+


      SYNTAX int SioBaud(int Port, int BaudCode)
             // Port     : -1 or port selected.
             // BaudCode : Baud code or actual baud rate.

      REMARK The SioBaud function sets the baud rate without resetting
             the port. It is used to change the baud rate after calling
             SioReset. SioBaud may be called with either the actual baud
             rate value or one of the baud rate codes as follows:

               Code   Rate    Name             Code   Rate   Name
                 0     300    Baud300            5    9600   Baud9600
                 1     600    Baud600            6   19200   Baud19200
                 2    1200    Baud1200           7   38400   Baud38400
                 3    2400    Baud2400           8   57600   Baud57600
                 4    4800    Baud4800           9  115200   Baud115200

             For example, to set 28800, SioBaud(Port,28800);

             Call SioBaud with Port==-1 before calling SioReset to set the
             default baud rate for subsequent calls to SioReset.

      RETURN    IE_BADID : No such port.
             IE_BAUDRATE : Unsupported baud rate.

       OTHER See SioReset.



      +-------------+-----------------------------------------------------+
      |  SioBrkSig  |  Asserts, cancels, or detects BREAK signal.         |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioBrkSig(int Port, int Cmd)
             // Port : Port selected.
             // Cmd  : ASSERT, CANCEL, or DETECT.

      REMARK The SioBrkSig function controls the BREAK bit in the line
             status register. The legal commands are:

             ASSERT_BREAK : 'A' to assert BREAK
             CANCEL_BREAK : 'C' to cancel BREAK
             DETECT_BREAK : 'D' to detect BREAK

             ASSERT_BREAK, CANCEL_BREAK, and DETECT_BREAK are defined in
             WSC.H. See MODEM.C for an example of the use of SioBrkSig.

      RETURN  IE_NOPEN : Port not opened. Call SioReset first.
              IE_BADID : No such port.
             WSC_RANGE : Illegal command. Expected 'A', 'C', or 'D'.
                    >0 : BREAK signal detected (DETECT command only)



     WSC4C Reference Manual                                    Page 4

      +-------------+-----------------------------------------------------+
      |   SioCTS    |  Reads the Clear to Send (CTS) modem status bit.    |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioCTS(int Port)
             // Port : Port selected.

      REMARK The SioCTS function is used to detect if CTS (Clear To Send)
             is set (1) or clear (0). Some Windows Win16 COMM drivers
             cannot read the CTS bit correctly!

             The CTS line is used by some error correcting modems to
             implement hardware flow control.  CTS is dropped by the modem
             to signal the computer not to send data and is raised to
             signal the computer to continue.

             Refer to the RS232/485 Serial Communications Users Manual
             (ASYNC.TXT) for a discussion of flow control.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                    0 : CTS is clear.
                   >0 : CTS is set.

       OTHER See SioFlow and SioRead.










      +-------------+-----------------------------------------------------+
      |   SioDCD    | Reads the Data Carrier Detect (DCD) modem status bit|
      +-------------+-----------------------------------------------------+

      SYNTAX int SioDCD(int Port)
             // Port : Port selected.

      REMARK The SioDCD function is used to read the Data Carrier Detect
             (DCD) modem status bit. Also see SioStatus.

             SioDCD is normally used after connecting to check that the
             carrier has not been dropped.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                    0 : DCD is clear.
                   >0 : DCD is set.

       OTHER See SioRead.




     WSC4C Reference Manual                                    Page 5

      +-------------+-----------------------------------------------------+
      |   SioDone   |  Terminates further serial processing.              |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioDone(int Port)
             // Port : Port selected.

      REMARK The SioDone function terminates further serial processing,
             allowing other applications to use the port.  SioDone should
             always be the last function called before exiting an
             application.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.

       OTHER See SioReset.









      +-------------+-----------------------------------------------------+
      |    SioDSR   |  Reads the Data Set Ready (DSR) modem status bit.   |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioDSR(int Port)
             // Port : Port selected.

      REMARK The SioDSR function is used to detect if DSR (Data Set Ready)
             is set (1) or clear (0). Some Windows Win16 COMM drivers
             cannot read the DSR bit correctly!

             Modems normally set DSR as soon as they are powered up.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                    0 : DSR is set.
                   >0 : DSR is clear.

       OTHER See SioRead.














     WSC4C Reference Manual                                    Page 6

      +-------------+-----------------------------------------------------+
      |    SioDTR   |  Set, clear, or read Data Terminal Ready (DTR).     |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioDTR(int Port, int Cmd)
             // Port : Port selected.
             // Cmd  : DTR command (see below).

      REMARK The SioDTR function controls the Data Terminal Ready (DTR) bit
             in the modem control register.  DTR should always be set when
             communicating with a modem.  Commands (defined in WSC.H):

                  SET_LINE   : 'S'  to set DTR (ON)
                  CLEAR_LINE : 'C'  to clear DTR (OFF)
                  READ_LINE  : 'R'  to read DTR

      RETURN IE_NOPEN  : Port not opened. Call SioReset first.
             IE_BADID  : No such port.
             WSC_RANGE : Not one of 'S', 'C', or 'R'.
                     0 : DTR is clear (READ_LINE Command).
                    >0 : DTR is set (READ_LINE Command).

       OTHER See SioRead.



      +-----------+-------------------------------------------------------+
      | SioEvent  |  Efficiently waits for serial event.                  |
      +-----------+-------------------------------------------------------+

      SYNTAX int SioEvent(int Port, DWORD Mask)
             // Port : Port selected.
             // Mask : Event Mask (see below).

      REMARK The SioEvent function (WIN32 only) waits (blocks) until the
             condition specfied in 'Mask' is satisfied. Multiple
             conditions can be OR'ed together. The event masks are:

              EV_RXCHAR : A character was received.
               EV_BREAK : A break signal was received.
                 EV_CTS : The CTS line changed states.
                 EV_DSR : The DST line changed states.
                 EV_ERR : An error was detected.
                EV_RLSD : The DCD line has changed states.
                EV_RING : The RI line has been set.
             EV_TXEMPTY : The TX queue has become empty.

      RETURN SioEvent does not return until the specified event occurs.

       OTHER See SioRead.








     WSC4C Reference Manual                                    Page 7

      +------------+------------------------------------------------------+
      |   SioFlow  |  Sets hardware (RTS/CTS) flow control.               |
      +------------+------------------------------------------------------+

      SYNTAX int SioFlow(int Port, char Cmd)
             // Port : Port selected.
             // Cmd  : Class of flow control (see below).

      REMARK The SioFlow function is used to enable or disable hardware
             flow control.  Hardware flow control uses RTS and CTS to
             control data flow between the modem and the computer.  To
             enable flow control, call SioFlow with Cmd set to:

                    Cmd     Flow Control
                  'H'  Hardware (RTS/CTS) flow control.
                  'S'  Software (XON/XOFF) flow control.
                  'N'  No flow control [default].

             In order for hardware flow control to work correctly, your
             modem must also be configured to work with hardware flow
             control, and your computer to modem cable must have RTS and
             CTS wired straight through. If you enable hardware flow
             control, do not modify the RTS line (by calling SioRTS). Flow
             control is disabled after resetting a port.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
            WSC_RANGE : Cannot recognize Cmd.
                  >0  : Flow control enabled.
                  0   : Flow control disabled.


       OTHER See SioPutc


      +------------+------------------------------------------------------+
      |   SioGetc  |  Reads the next character from the serial line.      |
      +------------+------------------------------------------------------+

      SYNTAX int SioGetc(int Port)
             // Port : Port selected.

      REMARK The SioGetc function reads a byte from the selected serial
             port. WSC_NO_DATA (-100) is returned if no byte is available.


      RETURN    IE_NOPEN : Port not opened. Call SioReset first.
                IE_BADID : No such port.
             WSC_NO_DATA : If timed out (no data available).
                    >= 0 : Character read.

       OTHER See SioUnGetc and SioGets.






     WSC4C Reference Manual                                    Page 8

      +------------+------------------------------------------------------+
      |   SioGets  |  Reads the next byte buffer from the serial line.    |
      +------------+------------------------------------------------------+

      SYNTAX int SioGets(int Port, LPSTR String, unsigned Cnt)
             // Port   : Port selected.
             // String : Pointer to receive buffer.
             // Cnt    : Number of bytes to read.

      REMARK The SioGets function reads the smaller of the number of bytes
             wanted (Cnt) and the number of bytes in the receive buffer. A
             zero is return if no bytes are read.


      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                 >= 0 : Number of characters actually read.

       OTHER See SioUnGetc and SioPutc.  See Modem.C and RS485.C for
             a programming example.



      +-------------+-----------------------------------------------------+
      |   SioInfo   |  Returns WSC4C library information.                 |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioInfo(int Cmd)
             // Cmd : Command (See below)

      REMARK The SioInfo function returns an integer code corresponding to
             the Cmd as follows.

                  Command   SioInfo returns
                    'V'     Library version number [3 hex digits].
                    '?'     Seconds until shareware screen is redisplayed.

             See LINE.C for an example of getting the version number. The
             '?' command can be used in the shareware version to find the
             number of seconds left before the shareware screen is
             displayed again. This function only has meaning in the
             SHAREWARE version of WSC.


      RETURN See remarks above.
             -1 : Cannot recognize command 'Cmd'.












     WSC4C Reference Manual                                    Page 9

      +-------------+-----------------------------------------------------+
      |  SioParms   |  Sets parity, stop bits, and word length.           |
      +-------------+-----------------------------------------------------+


      SYNTAX int SioParms(int Port,     int Parity,
                            int StopBits, int DataBits)
             // Port     : -1 or port selected.
             // Parity   : Parity code.
             // StopBits : Stop bits code.
             // DataBits : Word length code.

      REMARK The SioParms function sets the parity, stop bits, and word
             length.  If the default parity (none), stop bits (1), or word
             length (8) is not acceptable, then they can be changed by
             calling SioParms.  SioParms can be called either before or
             after calling SioReset. Call SioParms with Port==-1 before
             calling SioReset to make the passed parameters the default.
             Use the constant values defined in WSC.H to minimize the
             chance of passing an incorrect parameter value.

               Parity : NoParity, OddParity, EvenParity, MarkParity,
                        SpaceParity.
             StopBits : OneStopBit, One5StopBits, TwoStopBits.
             DataBits : WordLength7, WordLength8.

      RETURN    IE_BADID : No such port.
             IE_BYTESIZE : Word length not supported.
               WSC_RANGE : Parameter out of range.

       OTHER See SioReset.


      +-------------+-----------------------------------------------------+
      |   SioPutc   |  Transmit a character over a serial line.           |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioPutc(int Port, char Ch)
             // Port : Port selected.
             // Ch   : Character to send.

      REMARK The SioPutc function copies the character to the transmit
             queue for subsequent transmission.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                    0 : No error.

       OTHER See SioGetc and SioFlow.









     WSC4C Reference Manual                                    Page 10

      +-------------+-----------------------------------------------------+
      |   SioPuts   |  Transmits a byte buffer over a serial line.        |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioPuts(int Port, LPSTR String, unsigned Cnt)
             // Port   : Port selected.
             // String : Pointer to string of bytes to transmit.
             // Cnt    : Number of bytes to transmit.


      REMARK The SioPuts function copies 'Cnt' bytes from 'String' to the
             transmit queue for subsequent transmission.


      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                 >= 0 : The number of bytes actually transmitted.

       OTHER See SioGetc and SioFlow. See Modem.C and RS485.C for a
             programming example of SioPuts.


      +-------------+-----------------------------------------------------+
      |   SioRead   |  Reads any UART register.                           |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioRead(int Port, int Reg)
             // Port : Port selected.
             // Reg : UART register (0 to 7).

      REMARK SioRead is NOT for Win32 applications running under Windows
             NT. The SioRead function reads any of the 7 I/O ports
             directly, by-passing the Windows API. Note that the line
             status and the modem status registers can be read by:

             #define SioLine(Port) SioRead(Port,5)
             #define SioModem(Port) SioRead(Port,6)

             Note that all modem and/or line status bits can also be read
             using SioDTR, SioRTS, SioDCD, SioRI, SioDSR, and SioCTS.
             Refer to the RS232/485 Serial Communications Users Manual
             (ASYNC.TXT) for a discussion of the UART registers.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                   >0 : Contents of selected UART register.

       OTHER Not for Win32 applications running under Win NT.
             Also see SioStatus.









     WSC4C Reference Manual                                    Page 11

      +-------------+-----------------------------------------------------+
      |  SioReset   |  Initialize a serial port for processing.           |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioReset(int Port, int RxQueSize, int TxQueSize)
             // Port      : Port selected (or -1: see below).
             // RxQueSize : Receive queue size.
             // TxQueSize : Transmit queue size.

      REMARK The SioReset function initializes (opens) the selected serial
             port. SioReset should be called before making any other calls
             to WSC4C except for setting default behavior (port=-1).
             SioReset uses the parity, stop bits, and word length value
             previously set if SioParms was called, otherwise the default
             values (19200, no parity, 8 data, 1 stop) are used.

             SioReset can be called with Port=-1 in order to specify the
             behavior of DTR and RTS at port initialization:

                SioReset(-1, DTR_Default, RTS_Default)

             DTR will be set at port initialization if DTR_Default is 1,
             else DTR will be cleared. Similarly for RTS_Default. See
             LINE.C for an example.

      RETURN    IE_BADID : No such port.
                 IE_OPEN : Already open.
               IE_MEMORY : Cannot allocate memory.
             IE_HARDWARE : Hardware error.

       OTHER See SioBaud, SioParms, and SioDone.




      +-------------+-----------------------------------------------------+
      |    SioRI    |  Reads the Ring Indicator (RI) modem status bit.    |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioRI(int Port)
             // Port : Port selected.

      REMARK The SioRI function is used to read the Ring Indicator (RI)
             modem status bit.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.
                    0 : RI is clear.
                   >0 : RI is set (RING has occurred).

       OTHER See SioRead.







     WSC4C Reference Manual                                    Page 12

      +-------------+-----------------------------------------------------+
      |    SioRTS   |  Sets, clears, or reads the Request to Send (RTS).  |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioRTS(int Port, char Cmd)
             // Port : Port selected.
             // Cmd  : RTS command (SET, CLEAR, or READ).

      REMARK The SioRTS function controls the Request to Send (RTS bit in
             the modem control register.

             The RTS line is used by some error correcting modems to
             implement hardware flow control.  RTS is dropped by the
             computer to signal the modem not to send data and is raised
             to signal the modem to continue. RTS should be set when
             communicating with a modem unless Flow Control is being used.

             Refer to the RS232/485 Serial Communications Users Manual
             (ASYNC.TXT) for a discussion of flow control.  Commands
             (defined in WSC.H) are:

                    SET_LINE  'S' : set RTS (ON)
                  CLEAR_LINE  'C' : clear RTS (OFF)
                   READ_LINE  'R' : read RTS

      RETURN  IE_NOPEN : Port not opened. Call SioReset first.
              IE_BADID : No such port.
             WSC_RANGE : Command is not one of 'S', 'C', or 'R'.
                     0 : RTS is clear ('R' command).
                    >0 : RTS is set  ('R' command).

       OTHER See SioFlow and SioDTR.




      +------------+------------------------------------------------------+
      | SioRxClear |  Clears the receive buffer.                          |
      +------------+------------------------------------------------------+

      SYNTAX int SioRxClear(int Port)
             // Port : Port selected.

      REMARK The SioRxClear function will delete any characters in the
             receive buffer for the specified port.  After execution, the
             receive buffer will be empty.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.

       OTHER See SioRxQue.







     WSC4C Reference Manual                                    Page 13

      +-------------+-----------------------------------------------------+
      |  SioRxQue   |  Returns the number of bytes in the receive queue.  |
      +-------------+-----------------------------------------------------+

      SYNTAX int SioRxQue(int Port)
             // Port : Port selected.

      REMARK The SioRxQue function will return the number of characters in
             the receive queue at the time of the call.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.

       OTHER See SioTxQue




      +------------+------------------------------------------------------+
      | SioStatus  |  Returns the serial port status.                     |
      +------------+------------------------------------------------------+

      SYNTAX int SioStatus(int Port, unsigned Mask)
             // Port : Port selected.
             // Mask : Error mask.

      REMARK The SioStatus function returns the serial port error status
             corresponding to the Mask argument.

                WSC_RXOVER  : The receive queue overflowed.
                WSC_OVERRUN : An incoming byte was overwritten.
                 WSC_PARITY : A parity error was detected (incoming byte)
                  WSC_FRAME : A framing error was detected (incoming byte)
                  WSC_BREAK : A break signal was detected.
                 WSC_TXFULL : The transmit queue is full.

             For example, to test for receive queue overflow:

                if(SioStatus(Port, WSC_RXOVER)) printf("RX Overflow");

             The numerical values of the mask constants are defined in
             WSC.H.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.

       OTHER See SioRead.











     WSC4C Reference Manual                                    Page 14

      +-----------+-------------------------------------------------------+
      | SioTimer  |  Returns the current time in millisecoinds.           |
      +-----------+-------------------------------------------------------+

      SYNTAX DWORD SioTimer(void)

      REMARK The SioTimer returns the system time in milliseconds. SioTimer
             calls the Windows API function GetCurrentTime, and is provided
             as a convenience since GetCurrentTime could be called
             directly. For example, to delay 10 milliseconds:

                  DWORD TimeMark;
                  TimeMark = SioTimer() + 10;
                  while(SioTimer() < TimeMark);

      RETURN The system time in milliseconds.




      +------------+------------------------------------------------------+
      | SioTxClear |  Clears the transmitter buffer.                      |
      +------------+------------------------------------------------------+

      SYNTAX int SioTxClear(int Port)
             // Port : Port selected.

      REMARK The SioTxClear function will delete any characters in the
             transmit buffer for the specified port.

             Once this function is called, any character in the transmit
             buffer (put there by SioPutc or SioPuts) will be lost and
             therefore not transmitted.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.

       OTHER See SioTxQue.




















     WSC4C Reference Manual                                    Page 15

      +------------+------------------------------------------------------+
      |  SioTxQue  |  Returns the number of bytes in the transmit queue.  |
      +------------+------------------------------------------------------+

      SYNTAX int SioTxQue(int Port)
             // Port : Port selected.

      REMARK The SioTxQue function will return the number of characters in
             the transmit queue at the time of the call.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.

       OTHER See SioRxQue.





      +------------+------------------------------------------------------+
      | SioUnGetc  |  "Ungets" the last character read with SioGetc().    |
      +------------+------------------------------------------------------+

      SYNTAX int SioUnGetc(int Port, char Ch)
             // Port : Port selected.
             // Ch   : Character to unget.

      REMARK The SioUnGetc function returns ("pushes") the character back
             into the serial input buffer.  The character pushed will be
             the next character returned by SioGetc.  Only one character
             can be pushed back. This function works just like the
             "ungetc" function in the C language.

      RETURN IE_NOPEN : Port not opened. Call SioReset first.
             IE_BADID : No such port.

       OTHER See SioReset.





















     WSC4C Reference Manual                                    Page 16

      +--------------+----------------------------------------------------+
      | SioWinError  |  Return last Win32 error code & message text.      |
      +--------------+----------------------------------------------------+

      SYNTAX int SioWinError(LPSTR Buffer, int Size)
             // Buffer : Pointer to messages buffer.
             //   Size : Size of buffer.

      REMARK The SioWinError is a Win32 ONLY function that returns the last
             Win32 error code. If Buffer is not NULL, it will also copy the
             corresponding text message into 'Buffer' of size 'Size'.  Call
             SioError to display the error.

      RETURN The Win32 numeric error code.


                            WSC Error Codes



      +---------------+---------------------------------------------+
      |  WSC_NO_DATA  |  No incoming serial data is available.      |
      |  WSC_RANGE    |  A parameter is out of range.               |
      |  WSC_ABORTED  |  The shareware version of WSC corrupted.    |
      |  WSC_WIN32ERR |  Win32 system error.                        |
      +---------------+---------------------------------------------+
      |  IE_BADID     |  No such port.                              |
      |  IE_OPEN      |  Port already opened.                       |
      |  IE_NOPEN     |  Port not opened. Call SioReset first.      |
      |  IE_MEMORY    |  Cannot allocate memory for queues.         |
      |  IE_DEFAULT   |  Error in default parameters.               |
      |  IE_HARDWARE  |  Hardware not present.                      |
      |  IE_BYTESIZE  |  Unsupported byte size.                     |
      |  IE_BAUDRATE  |  Unsupported baud rate.                     |
      +---------------+---------------------------------------------+


      The WSC_ABORTED error occurs in the shareware version only if there
      is a problem displaying the shareware screen.

      The WSC_WIN32ERR error code is returned only for Win32 system errors.
      Call SioWinError to retrieve the error message.

      See SioError.C to display the text of the error message.














     WSC4C Reference Manual                                    Page 17

      +-----------+-------------------------------------------------------+
      | mioBreak  |  Aborts the Modem I/O state driver.                   |
      +-----------+-------------------------------------------------------+

      SYNTAX int mioBreak(int Port)
             // Port : Port selected.

      REMARK Forces the MIO driver to the IDLE state, abandoning any work
             in progress (if any). Used to abort mioSendTo, mioQuiet, and
             mioWaitFor functions.

      RETURN MIO_IDLE.







      +------------+------------------------------------------------------+
      | mioDriver  |  Modem I/O state driver.                             |
      +------------+------------------------------------------------------+

      SYNTAX int mioDriver(int Port)
             // Port : Port selected.

      REMARK Executes the next state of any previously started MIO function
             such as mioSendTo, mioWaitFor, and mioQuiet. Returns MIO_IDLE
             (defined in MIO.H) if idle (not running), MIO_RUNNING if
             running, and anything else is a character from the modem that
             can be displayed if wanted.

      RETURN  MIO_IDLE : if the driver is ready for the next mioSendTo,
                           mioWaitFor, or mioQuiet.
             MIO_RUNNING : if the driver is not idle.
                  <else> : if the driver is not idle, and the returned
                           character was received from the modem.





















     WSC4C Reference Manual                                    Page 18

      +-----------+-------------------------------------------------------+
      | mioQuiet  |  Waits for Modem I/O state driver.                    |
      +-----------+-------------------------------------------------------+

      SYNTAX int mioQuiet(int Port, unsigned long Wait)
             // Port : Port selected.
             // Wait : Wait in milliseconds.

      REMARK The mioQuiet function waits for continuous quiet [no incoming
             serial data] of 'Wait' milliseconds before returning.  Any
             incoming character while mioQuiet is running is lost.

      RETURN TRUE.




      +------------+------------------------------------------------------+
      | mioResult  |  Returns result of last mioWaitFor.                  |
      +------------+------------------------------------------------------+

      SYNTAX int mioResult(int Port)
             // Port : Port selected.

      REMARK The mioResult function returns the result of the last
             mioWaitFor function. This function should not be called until
             the driver returns MIO_IDLE. See the remarks section of the
             mioWaitFor function for an example.

      RETURN  0 : False (last WaitFor not matched)
             !0 : '0' if first substring matched, '1' if second substring
             matched, etc.

       OTHER See mioWaitFor.
























     WSC4C Reference Manual                                    Page 19

      +-----------+-------------------------------------------------------+
      | mioSendTo |  Sends string to modem.                               |
      +-----------+-------------------------------------------------------+

      SYNTAX int mioSendTo(int Port, unsigned long Pace, LPSTR Text)
             // Port : Port selected.
             // Pace : The inter-character delay in milliseconds.
             // String : The string to send.

      REMARK The mioSendTo function sends the characters in the string
             'Text' to serial output. There is a delay of 'Pace'
             milliseconds between characters.

             Three characters in 'Text' are interpreted as:

             '^' : next character is control char (^A for 0x01)
             '!' : replaced with carriage return.
             '~' : removed from string (delay 1/2 second).

      RETURN TRUE.





      +-------------+-----------------------------------------------------+
      | mioWaitFor  |  Waits for continuous quiet.                        |
      +-------------+-----------------------------------------------------+

      SYNTAX int mioWaitFor(int Port, long Wait, LPSTR Text)
             // Port : Port selected.
             // Wait : Total time to wait for response (milliseconds).
             // Text : The expected response string.

      REMARK The mioWaitFor function waits for characters from serial
             input that match the string 'Text'. A total of 'Wait'
             milliseconds are allowed before timing out and returning FALSE
             (0). The string comparison is NOT case sensitive.

             For example, to wait up to one minute for "CONNECT", "NO
             CARRIER", or "BUSY" from the modem after dialing a number:

             Code = mioWaitFor(Port,60000,"CONNECT|NO CARRIER|BUSY")

             The function mioDriver() must be called until MIO_IDLE is
             returned. Then mioResult() is called to get the result of the
             mioWaitFor.  A value of 0 indicates that neither "CONNECT",
             "BUSY", nor "NO CARRIER" was received. A non-zero value
             indicates that one of the three sub-strings was received.  A
             '0' is returned if "CONNECT" was seen, '1' is returned if "NO
             CARRIER" was seen, and '2' is returned if "BUSY" was seen.

      RETURN TRUE.

       OTHER See mioResult.



     WSC4C Reference Manual                                    Page 20

      +---------+---------------------------------------------------------+
      | xyAbort | Aborts the XYDRIVER state driver.                       |
      +---------+---------------------------------------------------------+

      SYNTAX int xyAbort(int Port);
             // Port :  Port selected.

      REMARK The xyAbort function forces the driver to IDLE, terminating
             any file transfer which may be in progress.

      RETURN XY_NO_ERROR (0).






      +-----------+-------------------------------------------------------+
      | xyAcquire | Prepares the state driver for operation.              |
      +-----------+-------------------------------------------------------+

      SYNTAX int xyAcquire(int Port);
             // Port :  Port selected.


      REMARK The xyAcquire function initializes the driver for subsequent
             use. This should be the first driver function called.

      RETURN =0 : No error (XY_NO_ERROR).
             <0 : XYDRIVER error. See "XYDRIVER Error Codes".

       OTHER See xyRelease.


























     WSC4C Reference Manual                                    Page 21

      +----------+--------------------------------------------------------+
      | xyDebug  | Set the driver debug level.                            |
      +----------+--------------------------------------------------------+

      SYNTAX int xyDebug(int DebugLevel);
             // DebugLevel : Debug level value.

      REMARK The xyDebug functions sets the driver debug level as follows:

             DebugLevel :  Meaning
                 0         Only error messages are generated [default].
                 1         Minimal debug messages are generated.
                 2         Maximal debug messages are generated.

             Debug messages are retrieved using the xyGetMessage function.

      RETURN New debug level [0,1,2]




      +----------+--------------------------------------------------------+
      | xyDriver | XMODEM / YMODEM state driver.                          |
      +----------+--------------------------------------------------------+

      SYNTAX int xyDriver(int Port);
             // Port :  Port selected.

      RETURN    XY_IDLE : A transfer is not underway.
             XY_RUNNING : A transfer is underway.

      REMARK The xyDriver function drives the state engine. It is normally
             called within a timer loop. Note that xyDriver never returns
             an error code.

             xyDriver can be called as often as wanted whether or not a
             file transfer was initiated.

       OTHER See xyStartTx and xyStartRx.



















     WSC4C Reference Manual                                    Page 22

      +---------------+---------------------------------------------------+
      | xyGetFileName |  Get the filename                                 |
      +---------------+---------------------------------------------------+

      SYNTAX int xyGetFileName(LPSTR Buffer, int Size);
             // Buffer : Filename buffer.
             // Size   : Size of Filename buffer.

      REMARK The xyGetFileName function gets the current filename. This
             function is designed for use on the receive side YMODEM
             protocol, where the filename is received as part of the first
             packet (packet #0). See TERM.C for an example of use.

      RETURN  TRUE : A message was copied into Buffer.
             FALSE : No messages are available.

       OTHER See xyGetParameter.



      +--------------+----------------------------------------------------+
      | xyGetMessage |  Get next XYDRIVER message.                        |
      +--------------+----------------------------------------------------+

      SYNTAX int xyGetMessage(LPSTR Buffer, int Size);
             // Buffer : Message buffer.
             // Size   : Size of message buffer.

      REMARK The xyGetMessage function retrieves the next message from the
             driver message queue. Refer to the TERM.C example program for
             an example of using xyGetMessage.

      RETURN  TRUE : A message was copied into Buffer.
             FALSE : No messages are available.

       OTHER See xyDebug.






















     WSC4C Reference Manual                                    Page 23

      +----------------+--------------------------------------------------+
      | xyGetParameter | Retrieves driver parameter.                      |
      +----------------+--------------------------------------------------+

      SYNTAX long xyGetParameter(int Port, int ParmName);
             // Port      : Port Selected.
             // Parameter : Parameter to return.

      REMARK The parameter value corresponding to the following table is
             returned.

                        ParmName : Description
                  XY_GET_VERSION : Returns XYDRV version (a.b.c).
               XY_GET_ERROR_CODE : Driver error code (see XYDRIVER.H)
              XY_GET_ERROR_STATE : Error state (if in error).
                   XY_GET_PACKET : Current packet number.
                    XY_GET_STATE : Current state (see XYDRIVER.C).
                XY_GET_FILE_SIZE : File size.
                 XY_GET_NBR_NAKS : Number of packets ACKed.
                 XY_GET_LAST_GET : Last incoming (serial) character.
                 XY_GET_LAST_PUT : Last outgoing (serial) character.
                XY_GET_GET_COUNT : Number of incoming characters (bytes).
                XY_GET_PUT_COUNT : Number of outgoing characters (bytes).
             XY_GET_DRIVER_COUNT : Number times xyDriver() was called.
                              -1 : Cannot recognize parameter.

             The xyGetParameter function can be used to check the state of
             the driver. For example:

            (1) xyGetParameter(Port,XY_GET_STATE) returns XY_IDLE if idle.
            (2) xyGetParameter(Port,XY_GET_ERROR_CODE) returns the driver
                error code if an error has occurred or XY_NO_ERROR (0)
                otherwise.

      RETURN See above.


      +-----------+-------------------------------------------------------+
      | xyRelease | Releases driver port.                                 |
      +-----------+-------------------------------------------------------+

      SYNTAX int xyRelease(int Port).
             // Port : Port selected.

      REMARK The xyRelease function releases a port that was previously
             acquired with xyAcquire. This function should be called before
             calling the WSC function SioDone.

      RETURN  0 : No error (XY_NO_ERROR).
             <0 : XYDRIVER error. See "XYDRIVER Error Codes".

       OTHER See xyAcquire.






     WSC4C Reference Manual                                    Page 24

      +----------------+--------------------------------------------------+
      | xySetParameter | Sets driver parameter.                           |
      +----------------+--------------------------------------------------+

      SYNTAX long xySetParameter(int Port, int ParmName, long ParmValue);
             // Port      : Port Selected.
             // ParmName  : Parameter Name.
             // ParmValue : Parameter Value.

      REMARK The ParmValue corresponding to the following table is set.

                        ParmName : Description
                 XY_SET_NAK_RATE : Sets the prompt delay (in seconds).
                 XY_SET_EOF_CHAR : Sets the XMODEM pad character.
                              -1 : Cannot recognize parameter.

             The XY_SET_NAK_RATE parameter sets the delay (in seconds)
             between prompts that the receiver transmits to the sender to
             start the file transfer. The legal range is 1 to 10 seconds.

             The XY_SET_EOF_CHAR parameter sets the pad character used by
             XMODEM in padding the last packet to 128 bytes. The normal
             value is control-Z (hex 1A). For example, to set the pad
             character to zeros:

                 xySetParameter(COM1, XY_SET_EOF_CHAR, 0);

      RETURN See above.

      +-----------+-------------------------------------------------------+
      | xyStartRx | Start XMODEM or YMODEM receive.                       |
      +-----------+-------------------------------------------------------+

      SYNTAX int xyStartRx(int Port, LPSTR Filename, char NCGchar,
                             int Batch)
             // Port     : Port to use.
             // Filename : File to receive (XMODEM only).
             // NCGchar  : NAK, 'C', or 'G'.
             // Batch    : YMODEM flag (T/F).

      REMARK The xyStartRx starts the XMODEM or YMODEM file receive. Once
             started, calls to xyDriver are made to execute the next state
             (or states). The xyStartTx function returns immediately. The
             protocols supported and their parameters are as follows:

             Protocol   :  NCGchar   BatchFlag  :  Comments
             XMODEM     :   NAK        FALSE       Standard XMODEM
             XMODEM/CRC :   'C'        FALSE
             XMODEM/1K  :   'C'        FALSE
             YMODEM     :   'C'        TRUE        Standard YMODEM

      RETURN TRUE : No error.
             FALSE : Not started. Port not active.

       OTHER See xyStartTx and xyDriver.



     WSC4C Reference Manual                                    Page 25

      +-----------+-------------------------------------------------------+
      | xyStartTx | Start XMODEM or YMODEM transmit.                      |
      +-----------+-------------------------------------------------------+

      SYNTAX int xyStartTx(int Port,LPSTR Filename,int OneK,int Batch)
             // Port     : Port to use.
             // Filename : File to send.
             // OneK     : Want 1K blocks (T/F).
             // Batch    : YMODEM flag (T/F).

      REMARK The xyStartTx starts the XMODEM or YMODEM file send. Once
             started, calls to xyDriver are made to execute the next state
             (or states). The xyStartTx function returns immediately. The
             protocols supported and their parameters are as follows:

             Protocol   :  OneKflag  BatchFlag : Comments
             XMODEM     :   FALSE      FALSE     Standard XMODEM
             XMODEM/CRC :   FALSE      FALSE
             XMODEM/1K  :   TRUE       FALSE
             YMODEM     :   TRUE       TRUE      Standard YMODEM

      RETURN TRUE : No error.
             FALSE : Not started. Port not active.

       OTHER See xyStartRx and xyDriver.


                         XYDRIVER Error Codes

      Error codes are always negative, except for "no error". Most of these
      error conditions rarely occur. Also note that XYDRIVER functions can
      return WSC errors. An error message is queued when an error occurs
      which can be retrieved with xyGetMessage.

      The numeric values for error codes can be found in XYDRIVER.H.

      +--------------------------+----------------------------------------+
      |              XY_NO_ERROR | No error. (0)                          |
      |         XY_UNKNOWN_ERROR | Unknown error.                         |
      |  XY_ALREADY_ACTIVE_ERROR | Port already acquired.                 |
      |     XY_CANNOT_OPEN_ERROR | Cannot open specified file.            |
      |      XY_EMPTY_FILE_ERROR | Specified file is empty.               |
      | XY_NO_STARTUP_CHAR_ERROR | Must specify NAK, 'C', or 'G'.         |
      |         XY_NOT_NCG_ERROR | Expected NAK, 'C', or 'G'.             |
      |       XY_DISK_READ_ERROR | Error reading disk.                    |
      |      XY_NO_EOT_ACK_ERROR | EOT was not ACKed.                     |
      |        XY_INTERNAL_ERROR | Internal error!                        |
      |       XY_CANCELLED_ERROR | Other side canceled.                   |
      |     XY_OUT_OF_SYNC_ERROR | Protocol has lost synchronization.     |
      |         XY_RETRIES_ERROR | Packet retry limit was exceeded.       |
      |  XY_BAD_PACKET_NBR_ERROR | Incorrect packet number.               |
      |       XY_TIMED_OUT_ERROR | Timed out waiting for other side.      |
      |    XY_NO_SUCH_FILE_ERROR | No such file.                          |
      |      XY_NOT_ACTIVE_ERROR | Port not acquired by xyAcquire.        |
      |      XY_PORT_RANGE_ERROR | Port number out of range.              |
      +--------------------------+----------------------------------------+


     WSC4C Reference Manual                                    Page 26

