Using a COM Port

The simplest Citect SCADA systems use a single computer connected to the I/O device(s). You can connect an I/O device directly to a communications portPC port used for sending and receiving serial data (also called serial or COM ports). with a standard RS-232 communications cable.

1. Verify that the Boards configuration has COMx as the Type, and the Address set to 0. The I/O Port, Interruptand Special Opt can be left blank.
2. Enter the Port Number in the Ports configuration. The COM port number will usually be either 1 or 2, and is set in the Ports section of the Control Panel. Use the Special Opt field to modify the behavior of the COMx driver. (See COMx driver special options reference for more information).

Note: You only need to define the COMx board once. You can then add several ports that use the same Citect SCADA board. For example, a COM port and two serial boards could be defined as one COMx board in Citect SCADA, with multiple ports.

See Also

Published June 2018