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-
-
- Windows Standard Communications
-
- Library for Visual Basic
-
- (WSC4VB)
-
-
- REFERENCE MANUAL
-
-
-
- Version 1.0
-
- August 25, 1996
-
-
-
-
- This software is provided as-is.
- There are no warranties, expressed or implied.
-
-
-
-
- Copyright (C) 1996
- All rights reserved
-
-
-
- MarshallSoft Computing, Inc.
- Post Office Box 4543
- Huntsville AL 35815
-
- Voice : 205-881-4630
- FAX : 205|880|0925
- BBS : 205-880-9748
- email : info@marshallsoft.com
- web : www.marshallsoft.com
-
- _______
- ____|__ | (R)
- --+ | +-------------------
- | ____|__ | Association of
- | | |_| Shareware
- |__| o | Professionals
- --+--+ | +---------------------
- |___|___| MEMBER
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- WSC4VB Reference Manual Page 1
- C O N T E N T S
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- Chapter Page
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- Table of Contents.............................2
- List of Functions.............................3
- SioBaud....................................3
- SioBrkSig..................................3
- SioCTS.....................................4
- SioDCD.....................................4
- SioDone....................................5
- SioDSR.....................................5
- SioDTR.....................................6
- SioFlow....................................6
- SioGetc....................................7
- SioGets....................................7
- SioInfo....................................8
- SioParms...................................8
- SioPutc....................................9
- SioPuts....................................9
- SioReset..................................10
- SioRI.....................................10
- SioRTS....................................11
- SioRxClear................................11
- SioRxQue..................................12
- SioStatus.................................12
- SioTxClear................................13
- SioTxQue..................................13
- SioUnGetc.................................14
- Function Summary.............................14
- Error Code Summary...........................15
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- WSC4VB Reference Manual Page 2
- +-------------+------------------------------------------------------------+
- | SioBaud | Sets the baud rate of the selected port. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioBaud(ByVal Port,ByVal BaudCode)
- REM Port : Port selected.
- REM BaudCode : Baud code or actual baud rate.
-
- Remarks 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
-
-
- Returns IE_BADID : No such port.
- IE_BAUDRATE : Unsupported baud rate.
-
- See Also SioReset
-
-
-
-
-
-
- +-------------+------------------------------------------------------------+
- | SioBrkSig | Asserts, cancels, or detects BREAK signal. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioBrkSig(ByVal Port,ByVal Cmd)
- REM Port : Port selected.
- REM Cmd : ASSERT, CANCEL, or DETECT
-
- Remarks The SioBrkSig function controls the BREAK bit in the line status
- register. The legal commands are:
-
- ASSERT_BREAK : ASC("A") to assert BREAK
- CANCEL_BREAK : ASC("C") to cancel BREAK
- DETECT_BREAK : ASC("D") to detect BREAK
-
- ASSERT_BREAK, CANCEL_BREAK, and DETECT_BREAK are defined in
- WSC4VB.BAS. See TERM.BAS for an example of the use of SioBrkSig.
-
- Returns 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)
-
- See Also SioBrkKey
-
-
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-
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- WSC4VB Reference Manual Page 3
- +-------------+------------------------------------------------------------+
- | SioCTS | Reads the Clear to Send (CTS) modem status bit. |
- +-------------+------------------------------------------------------------+
-
- Syntax FUNCTION SioCTS(ByVal Port)
- REM Port : Port selected.
-
-
- Remarks The SioCTS function is used to detect if CTS (Cleat To Send) has
- changed since the last call to SioCTS.
-
- 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 User's Manual for a discussion of flow control.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- 0 : CTS has not changed.
- >0 : CTS has changed.
-
- See Also SioFlow, SioDSR, SioRI, SioDCD, and SioModem.
-
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- +-------------+------------------------------------------------------------+
- | SioDCD | Reads the Data Carrier Detect (DCD) modem staus bit. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioDCD(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioDCD function is used to read the Data Carrier Detect
- (DCD) modem status bit. Also see SioModem.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- 0 : DCD is clear.
- >0 : DCD is set.
-
- See Also SioDSR, SioCTS, SioRI, and SioModem.
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- WSC4VB Reference Manual Page 4
- +-------------+------------------------------------------------------------+
- | SioDone | Terminates further serial processing. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioDone(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioDone function terminates further serial processing,
- allowing other applications to use the port.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
-
- See Also SioReset.
-
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- +-------------+------------------------------------------------------------+
- | SioDSR | Reads the Data Set Ready (DSR) modem status bit. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioDSR(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioDSR function is used to detect if DSR (Data Set Ready)
- has changed since the last call to SioDSR.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- 0 : DSR has not changed.
- >0 : DSR has changed.
-
- See Also SioCTS, SioRI, SioDCD, and SioModem
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- WSC4VB Reference Manual Page 5
- +-------------+------------------------------------------------------------+
- | SioDTR | Set, clear, or read Data Terminal Ready (DTR) status bit. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioDTR(ByVal Port,ByVal Cmd)
- REM Port : Port selected.
- REM Cmd : DTR command (see below).
-
- Remarks 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 WSC4VB.BAS)
- are:
-
- SET_LINE : ASC("S") to set DTR (ON)
- CLEAR_LINE : ASC("C") to clear DTR (OFF)
- READ_LINE : ASC("R") to read DTR
-
- Returns 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 OFF (READ_LINE Command).
- >0 : DTR is ON (READ_LINE Command).
-
- See Also SioRTS.
-
-
-
- +------------+-------------------------------------------------------------+
- | SioFlow | Sets hardware (RTS/CTS) flow control. |
- +------------+-------------------------------------------------------------+
-
-
- Syntax FUNCTION SioFlow(ByVal Port,ByVal Cmd)
- REM Port : Port selected.
- REM Cmd : Class of flow control (see below).
-
- Remarks 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 hardware
- flow control, call SioFlow with Cms set to one of:
-
- Cmd Flow Control
- ASC("H") Hardware (RTS/CTS) flow control.
- ASC("S") Software (XON/XOFF) flow control.
- ASC("N") No flow control.
-
- 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. To explicitly
- disable hardware flow control, call SioFlow with Tics=-1.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- WSC_RANGE : Cannot recognize Cmd.
- -1 : Flow control disabled.
- >0 : Flow control enabled.
-
- See Also SioPutc
-
-
-
-
- WSC4VB Reference Manual Page 6
- +------------+-------------------------------------------------------------+
- | SioGetc | Reads the next character from the serial line. |
- +------------+-------------------------------------------------------------+
-
-
- Syntax FUNCTION SioGetc(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioGetc function reads a byte from the selected serial port.
- A WSC_NO_DATA (-100) is returned if no byte is available.
-
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- WSC_NO_DATA : If timed out.
- >= 0 : Character read.
-
- See Also SioUnGetc and SioGets.
-
-
-
-
-
-
-
-
- +------------+-------------------------------------------------------------+
- | SioGets | Reads the next byte buffer from the serial line. |
- +------------+-------------------------------------------------------------+
-
-
- Syntax FUNCTION SioGetc(ByVal Port,ByVal Buffer As String, ByVal Cnt)
- REM Port : Port selected
- REM Buffer : Receive buffer
- REM Cnt : Number bytes wanted
-
- Remarks The SioGets function reads the smaller of the number of bytes
- wanted (Cnt) and the number of bytes in the recieve buffer. A
- zero is return if no bytes are read.
-
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- >= 0 : Number of characters actually read.
-
- See Also SioUnGetc and SioPutc.
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- WSC4VB Reference Manual Page 7
- +-------------+------------------------------------------------------------+
- | SioInfo | Returns WSC4VB library information. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioInfo(ByVal Cmd)
- REM Cmd : Command (See below)
-
- Remarks The SioInfo function returns an integer code corresponding to
- the Cmd as follows.
-
- Command SioInfo returns
- ASC("V") Library version number.
-
-
- Returns See remarks above.
- -1 : Cannot recognize Cmd.
-
-
-
-
-
-
- +-------------+------------------------------------------------------------+
- | SioParms | Sets parity, stop bits, and word length. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioParms(ByVal Port,ByVal Parity,
- ByVal StopBits,ByVal DataBits)
- REM Port : Port selected.
- REM Parity : Parity code [0,1,2].
- REM StopBits : Stop bits code [0,1].
- REM DataBits : Word length code [0,1,2,3].
-
- Remarks 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. See file WSC4VB.BAS.
-
- Use the constant values defined in WSC4VB.BAS to minimize the
- chance of passing an incorrect parameter value.
-
- Value Description WSC4VB.BAS Name
- ParityCode: *0 no parity NoParity
- 1 odd parity OddParity
- 2 even parity EvenParity
- StopBitsCode: *0 1 stop bit OneStopBit
- 2 2 stop bits TwoStopBits
- WordLengthCode: 5 5 data bits WordLength5
- 6 6 data bits WordLength6
- 7 7 data bits WordLength7
- *8 8 data bits WordLength8
-
- Returns IE_BADID : No such port.
- IE_BYTESIZE : Word length not supported.
- WSC_RANGE : Parameter out of range.
-
- See Also SioReset.
-
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- WSC4VB Reference Manual Page 8
- +-------------+------------------------------------------------------------+
- | SioPutc | Transmit a character over a serial line. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioPutc(ByVal Port,ByVal Ch)
- REM Port : Port selected.
- REM Ch : Character to send [ASC(char)]
-
- Remarks The SioPutc function copies the character to the transmit queue
- for subsequent transmission.
-
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- 0 : No error.
-
- See Also SioGetc and SioFlow.
-
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- +-------------+------------------------------------------------------------+
- | SioPuts | Transmits a byte buffer over a serial line. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioPutc(ByVal Port,ByVal Buffer As String,ByVal Cnt)
- REM Port : Port selected.
- REM Buffer : String of bytes to transmit.
-
- Remarks The SioPuts function copies the characters to the transmit queue
- for subsequent transmission.
-
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- >= 0 : The number of bytes actually transmitted.
-
- See Also SioGetc and SioFlow.
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- WSC4VB Reference Manual Page 9
- +-------------+------------------------------------------------------------+
- | SioReset | Initialize a serial port for processing. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioReset(ByVal Port,ByVal RxQueSize,ByVal TxQueSize)
- REM Port : Port selected.
- REM RxQueSize : Receive queue size.
- REM TxQueSize : Transmit queue size.
-
- Remarks The SioReset function initializes the selected serial port.
- SioReset should be called before making any other calls to
- WSC4VB. SioReset uses the parity, stop bits, and word length
- value previously set if SioParm was called, otherwise the
- default values (see SioParm) are used.
-
- Recall that COM1 and COM3 share the same interrupt vector and
- therefore cannot operate simultaneously. Similiarly, COM2 and
- COM4 cannot operate simultaneously. Any other combination of two
- ports can be used.
-
- Returns IE_BADID : No such port.
- IE_OPEN : Already open.
- IE_MEMORY : Cannot allocate memory.
- IE_HARDWARE : Hardware error.
-
- See Also SioBaud, SioParms, and SioDone.
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-
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- +-------------+------------------------------------------------------------+
- | SioRI | Reads the Ring Indicator (RI) modem status bit. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioRI(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioRI function is used to read the Ring Indicator
- (RI) modem status bit. Also see SioModem.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
- 0 : RI is clear.
- >0 : RI is set (RING has occurred).
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- See Also SioDSR, SioCTS, SioDCD, and SioModem.
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- WSC4VB Reference Manual Page 10
- +-------------+------------------------------------------------------------+
- | SioRTS | Sets, clears, or reads the Request to Send (RTS) line. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioRTS(ByVal Port, ByVal Cmd)
- REM Port : Port selected.
- REM Cmd : RTS command (SET, CLEAR, or READ)
-
- Remarks 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 User's Manual for a discussion of flow control.
- Commands (defined in WSC4VB.BAS) are:
-
- SET_LINE ASC("S") - set RTS (ON)
- CLEAR_LINE ASC("C") | clear RTS (OFF)
- READ_LINE ASC("R") - read RTS
-
- Returns 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 OFF (READ_LINE Command).
- >0 : RTS is ON (READ_LINE Command).
-
- See Also SioFlow and SioDTR.
-
-
-
-
-
- +------------+-------------------------------------------------------------+
- | SioRxClear | Clears the receive buffer. |
- +------------+-------------------------------------------------------------+
-
-
- Syntax FUNCTION SioRxClear(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioRxClear function will delete any characters in the
- receive buffer for the specified port. After execution, the
- receive buffer will be empty. Call SioRxClear after resetting a
- port in order to delete any spurious characters.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
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- See Also SioRxQue.
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- WSC4VB Reference Manual Page 11
- +------------+-------------------------------------------------------------+
- | SioStatus | Returns the serial port status. |
- +------------+-------------------------------------------------------------+
-
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- Syntax FUNCTION SioStatus(ByVal Port,ByVal Mask)
- REM Port : Port selected.
- REM Mask : Error mask.
-
- Remarks 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) <> 0 Then
- Print "RX Overflow"
- End if
-
- The nummerical values of the mask constants are defined in
- WSC4VB.BAS.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
-
-
-
-
- +-------------+------------------------------------------------------------+
- | SioRxQue | Returns the number of bytes in the receive queue. |
- +-------------+------------------------------------------------------------+
-
-
- Syntax FUNCTION SioRxQue(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioRxQue function will return the number of characters in
- the receive queue at the time of the call. It can be used to
- implement XON/XOFF flow control.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
-
- See Also SioRxFlush.
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- WSC4VB Reference Manual Page 12
- +------------+-------------------------------------------------------------+
- | SioTxClear | Clears the transmitter buffer. |
- +------------+-------------------------------------------------------------+
-
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- Syntax FUNCTION SioTxClear(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioTxClear function will delete any characters in the
- transmit buffer for the specified port, provided that you will
-
- Once this function is called, any character in the transmit
- buffer (put there by SioPutc) will be lost and therefore not
- transmitted.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
-
- See Also SioTxQue & SioTxFlush.
-
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- +------------+-------------------------------------------------------------+
- | SioTxQue | Returns the number of bytes in the transmit queue. |
- +------------+-------------------------------------------------------------+
-
-
- Syntax FUNCTION SioTxQue(ByVal Port)
- REM Port : Port selected.
-
- Remarks The SioTxQue function will return the number of characters in
- the transmit queue at the time of the call.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
-
- See Also SioTxFlush.
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- WSC4VB Reference Manual Page 13
- +------------+-----+-------------------------------------------------------+
- | SioUnGetc | "Un|gets" the last character read with SioGetc(). |
- +------------+-----+-------------------------------------------------------+
-
-
- Syntax FUNCTION SioUnGetc(ByVal Port,ByVal Ch)
- REM Port : Port selected.
- REM Ch : Character to unget.
-
- Remarks 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.
-
- Returns IE_NOPEN : Port not opened. Call SioReset first.
- IE_BADID : No such port.
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- See Also SioReset.
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- WSC4VB Reference Manual Page 14
- Function Summary
-
- Refer to the WSC4VB Reference Manual (WSC4VB.REF) for detailed information on
- the communications and support functions. A one line summary of each
- function follows:
-
- +---------------+-----------------------------------------------------------+
- | SioBaud | Sets the baud rate of the selected port. |
- | SioBrkSig | Asserts, cancels, or detects BREAK signal. |
- | SioCTS | Reads the Clear to Send (CTS) modem status bit. |
- | SioDCD | Reads the Data Carrier Detect (DCD) modem status bit. |
- | SioDone | Terminates further serial processing. |
- | SioDSR | Reads the Data Set Ready (DSR) modem status bit. |
- | SioDTR | Set, clear, or read the Data Terminal Ready (DTR) bit. |
- | SioFlow | Enables / disables hardware flow control. |
- | SioGetc | Reads the next character from the serial line. |
- | SioGets | Reads a character string from the serial line. |
- | SioInfo | Returns information such as library version. |
- | SioParms | Sets parity, stop bits, and word length. |
- | SioPutc | Transmit a character over a serial line. |
- | SioPuts | Transmit a character string over a serial line. |
- | SioReset | Initialize a serial port for processing. |
- | SioRI | Reads the Ring Indicator (RI) modem status bit. |
- | SioRTS | Sets, clears, or reads the Request to Send (RTS) line. |
- | SioRxClear | Clears the receive buffer. |
- | SioRxQue | Returns the number of characters in the receive queue. |
- | SioStatus | Returns the serial line status. |
- | SioTxClear | Clears the transmit buffer. |
- | SioTxQue | Returns the number of characters in the transmit queue. |
- | SioUnGetc | "Un-gets" (puts back) a specified character. |
- +---------------+-----+-----------------------------------------------------+
-
-
- Error Code Summary
-
-
- +---------------+---------------------------------------------+
- | WSC_NO_DATA | No incoming serial data is available. |
- | WSC_RANGE | A parameter is out of range. |
- | WSC_ABORTED | The shareware version of WSC has expired. |
- +---------------+---------------------------------------------+
- | 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. |
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- WSC4VB Reference Manual Page 15
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