Crestron
QM-RMCRX
QuickMedia™ Receiver/Processor
Troubleshooting Communications
Use the following checklist if communication cannot be established with the
QM-RMCRX.
1. Verify that you are using the correct cables. As described previously,
an RS-232 connection requires a null modem RS-232 cable with DB9
female connectors on both ends. TCP/IP connection requires a CAT5
cable with 8-pin RJ-45 connectors.
2. With a serial connection, verify that the correct COM port on the PC
has been selected. Some computers have more than one COM port;
some may be internal (e.g., for a modem). Consult the manufacturer’s
documentation for further information about the COM ports on your
PC.
3. Ensure that you have a serial connection to Port B, and reset the control
system as follows:
a. Open Viewport and click
Setup | Communications Settings
to
display the “Port Settings” window. Choose
RS-232
as the
connection type.
b. Set the baud rate of the PC to
115200
.
c. Set the baud rate of the QM-RMCRX control system to 115200, as
follows:
-
Press and release the
HW-R
button on the unit’s front panel.
-
Press and hold the
SW-R
button for approximately three to
five seconds. The Viewport console should display the
following message:
Viewport Message
QMRMCRX>
Control Console
Changing to default Comm Specs. 115200 N81 RTS/CTS
Switch to new settings….
Bypassing Program Load!!!
- Release
the
SW-R
button.
d. If communication still cannot be established:
-
Remove power from the control system.
-
Press and hold the
SW-R
button on the front panel of the QM-
RMCRX.
-
Reapply power to the control system.
-
The Viewport console should display the message shown
above.
- Release
the
SW-R
button.
e. Select
Set Baud Rate
on the Viewport
Functions
menu (or press
F8
) and choose any baud rate from the drop-down list. This will
attempt to establish a connection at the indicated baud rate. If the
connection is successful, both the PC and the control system will
be set to the new baud rate. The QM-RMCRX will return to its
original communication settings when the program reinitializes.
Operations Guide – DOC. 6236A
QuickMedia™ Receiver/Processor: QM-RMCRX
•
23
