Comtrol Multiport Modems Windows NT - Manual (Page 36)

Comtrol Tools 36
Testing a Comtrol Device (RS-485)
3. If further testing is required, select Loopback Test from the Port menu.
If the loopback plug is in place and the port is
working correctly, the system should return
the message Passed.
If the loopback plug is not in place or the port
is not working correctly, the system will return
the message Failed.
Testing a Comtrol
Device (RS-485) Perform the following procedure to determine if a port or ports are functioning
properly.
1. Connect a straight-through cable from Port 1 to Port 2.
Note: See the hardware installation document for the Comtrol device if you
need to build a cable.
If testing ports other than Ports 1 and 2, simply connect the cable
between any two ports.
2. Open a session for each port.
3. Enter data into the Port 1 session. The data should appear in the Port 2
window.
4. Enter data into the Port 2 session. The data should appear in the Port 1
window.
Note: If the data appears as described in Steps 3 and 4, the hardware is
functioning properly.
Test Terminal
Modem Control
Signals The terminal window displays the modem control signals as gray
or green lights at the top of the window. The first four are inputs:
The lights are green if they are turned on, or gray if turned off.
The text on the light also changes from uppercase (CTS), which is on, to lowercase
(cts), which is off.
The next two lights are outputs:
Note: If you have a loopback plug connected and you click on one of the outputs,
the corresponding signal is sent to the input and the input lights should
toggle accordingly.
The right most light is the loop indicator:
If this is on, the COM port internal loopback feature is activated and any
information or code entered in the terminal window loops back through the COM
port circuitry. If this is off, the COM port internal loopback is deactivated, and any
information or code entered in the terminal window is sent out of the port.