Comtrol WCom2 - Manual (Page 28)

28 - Using Test Terminal Port Monitor and Test Terminal User Guide: 2000485 Rev. B
Sending and Receiving Data (RS-485: 2-Wire)
Both COM ports show Ready on the status bar.
4. Right-click in ONE window and select the Receive option from the pop up.
5. Right-click the OPPOSITE window and click Send.
The Status line shows Sending or Receiving.
In this case, COM40 is sending data and COM41 is receiving the data which is
visually confirmed by the data scrolling across the COM41 window.
Note: If you do not see the data being received it MAY be necessary to also
disable the RTS and DTR options from the right-click pop-up menu in
each COM port.
6. Right-click and remove the check mark on the Sending COM port.