Applies To:
  • CitectSCADA 5.00
Summary:
The following options are supported by the COMX driver in 32 bit versions of Citect. 

Solution:
Options are space separated and starts with the character '-' immediatly followed by the option characters. Only a very small percentage of users will need to use the following options.

DCD (Data Carrier Detect)

-cATS0=1 Send the string 'ATS0=1<CR>' on startup to allow the modem to detect the baud rate the port is running at. Abandon transmit if DCD is low. Wait for incoming call to raise DCD.

DSR (Data Set Ready)

-d Windows will transmit data only when DSR is high.

-di Windows will ignore received data when DSR is low.

-dMS When transmitting a message the driver will wait up to 2000 ms for DSR to go high, then wait another MS milliseconds before transmitting.

CTS (Clear To Send)

-h Windows will transmit data only when CTS is high.

-hMS When transmitting a message the driver will wait up to 2000 ms for CTS to go high, then wait another MS milliseconds before transmitting.

RTS (Request To Send)

-t Driver will raise RTS only when transmitting.

-ti Windows will raise RTS when there is enough room in the input buffer to receive incoming characters and drop RTS when there is not enough room in the input buffer.

-to Windows will raise RTS only when there are characters to transmit.

-tPRE,POST When transmitting a message the driver will raise RTS for PRE milliseconds, transmit message, wait for POST milliseconds then drop RTS.

DTR (Data Terminal Ready)

-r Driver will raise DTR only when transmitting.

-ri Windows will raise DTR when there is enough room in the input buffer to receive incoming characters and drop DTR when there is not enough room in the input buffer.

-rPRE,POST When transmitting a message the driver will raise DTR for PRE milliseconds, transmit message, wait for POST milliseconds then drop DTR.
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