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Professional Automation Computer Crestron PAC2
Troubleshooting Communications
Use the following checklist if communication cannot be established with the PAC2.
1. Verify that you are using the correct cables. As described previously,
an RS-232 connection requires a straight-through serial cable. That is,
pin 1 on one end is connected to pin 1 on the other end; pin 2 connects
to pin 2, etc. With a TCP/IP connection, you must use a CAT5 cable
with 8-pin RJ45 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. Check the ERR LED indicator on the top panel of the PAC2. If this
LED is illuminated, unplug the unit and reapply power after a few
seconds. If the LED illuminates again, call Crestron customer service.
4. With a serial connection, 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 PAC2 control system to 115200, as
follows:
- Press and release the HW-R button on the unit’s top panel.
- Press and hold the SW-R button for approximately three to
five seconds. The Viewport console should display the
following message:
Viewport Message
- 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 top panel of the PAC2.
- 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.
22 • Professional Automation Computer: PAC2 Operations Guide – Doc. 5941