Applies To:
  • CitectSCADA 5.xx

I have a device that we would normally communicate to using a serial connection (eg. RS232, etc.). I now want to connect this device to my Ethernet network using a "Terminal Server". How do I do this? 

Terminal Servers can normally be used in one of two ways.

1. Redirection of a COM port.

By installing a Windows driver (usually provided by the manufacturer of the terminal server) the serial port of the Terminal Server can appear as if it was directly connected to the PC. The 'application' (in this case Citect) knows nothing about the fact that the device is joined to the device by an Ethernet network and terminal server.

2. TCP/IP port acting as COM port

This solution does not require the use of a Windows driver to redirect a COM port, but it does mean that the application itself needs to redirect its output via TCP/IP to a specific TCP/IP port instead of a COM port. Citect's serial drivers sometimes have the ability to do this but this is not guaranteed.

See also KB article Q2633, Q2449, Q2880 & Q1339.