Device control string syntax
The device-control string uses the syntax of the mode command. The string must have the same form as the mode command's command-line arguments. For further information on mode command syntax, refer to the end-user documentation for your operating system.
Syntax
modecomm[:] [baud=b] [parity=p] [data=d] [stop=s] [to={on|off}] [xon={on|off}] [odsr={on|off}] [octs={on|off}] [dtr={on|off|hs}] [rts={on|off|hs|tg}] [idsr={on|off}]Parameters
com m[:] | Specifies the number of the port for asynchronous communications (COM). |
baud= b | Specifies the transmission rate in bits per second. The following table lists valid abbreviations for b and its related baud rate.
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parity= p | Specifies how the system uses the parity bit to check for transmission errors. The following table lists the valid values: p. The default value is e. Not all computers support the values m and s.
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data= d | Specifies the number of data bits in a character. Valid values for d are in the range 5 to 8. The default value is 7. Not all computers support the values 5 and 6. |
stop= s | Specifies the number of stop bits that define the end of a character: 1, 1.5 or 2. If the baud rate is 110, the default value is 2. Otherwise, the default value is 1. Not all computers support the value 1.5. |
to={on|off} | Specifies whether the endless timeout processing is on or off. The default value is off. |
xon={on|off} | Specifies whether the xon or xoff protocol for data-flow control is on or off. |
odsr={on|off} | Specifies whether output handshaking that uses the Data Set Ready (DSR) signal is on or off. |
octs={on|off} | Specifies whether output handshaking that uses the Clear To Send (CTS) signal is on or off. |
dtr={on|off|hs} | Specifies whether the Data Terminal Ready (DTR) signal is on or off, or set to handshake. |
rts={on|off|hs|tg} | Specifies whether the Request To Send (RTS) signal is set to on, off, handshake or toggle. |
idsr={on|off} | Specifies whether the DSR signal is used or not. |
Things to know:
- For a string such as 96,n,8,1 or any other older-form mode string that doesn't end with an x or a p:
- fInX, fOutX, fOutXDsrFlow and fOutXCtsFlow are all set to FALSE
- fDtrControl is set to DTR_CONTROL_ENABLE
- fRtsControl is set to RTS_CONTROL_ENABLE
- For a string such as 96,n,8,1,x or any other older-form mode string that ends with an x:
- fInX and fOutX are both set to TRUE
- fOutXDsrFlow and fOutXCtsFlow are both set to FALSE
- fDtrControl is set to DTR_CONTROL_ENABLE
- fRtsControl is set to RTS_CONTROL_ENABLE
- For a string such as 96,n,8,1,p or any other older-form mode string that ends with a p:
- fInX and fOutX are both set to FALSE
- fOutXDsrFlow and fOutXCtsFlow are both set to TRUE
- fDtrControl is set to DTR_CONTROL_HANDSHAKE
- fRtsControl is set to RTS_CONTROL_HANDSHAKE