Note: If EWS software, such as Composer or WinCAD, is set up on the same computer, then you may wish to move the serial connection to a different COM port. This way you do not have to change any settings in the EWS software, but that software and CIUMon are not trying to access the same port.
Note: If the Communication Modes tab does not appear, you may be running CIUMon in relay mode. Load another configuration, and choose (New DCS Configuration) or another configuration that is in DCS mode.