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Crestron PAC2 
 
Professional Automation Computer
 
Problem Solving 
Problems may occur with the 2-Series automation control system itself or there may 
be serial communication difficulties with other devices connected to the control 
system. The next two sections address possible problem solving tools or procedures 
for each situation.  
Possible Problems with the Control System 
Troubleshooting the Control System 
The following table provides corrective action for possible trouble situations. If 
further assistance is required, please contact a Crestron customer service 
representative.  
2-Series Integrated Dual Bus Control System Troubleshooting 
TROUBLE
POSSIBLE 
CAUSE(S)
CORRECTIVE ACTION
Unexpected 
response from 
control system.
Network devices are not 
communicating to the 
control system.
From the Viewport, poll the network (F4) to 
verify communication. If all devices respond, 
use Network Analyzer to check quality of 
connections and network.
PWR LED does 
not illuminate.
Control system is not 
receiving power.
Verify that supplied power cord is properly 
attached to control system and the other end is 
securely plugged into an outlet. 
ERR LED 
illuminates.
Hardware or software 
failure, hardware 
incompatibility with 
software definitions, 
programming error, or 
system message.
Verify that hardware configuration matches 
software configuration (i.e., card is in proper 
slot as defined by program). Use Viewport to 
display the error log. 
Compilation error 
RLCMCVT166 & 
RLCMCVT177.
Poor analog versus serial 
signal definition in the 
SIMPL Windows program.
Confirm proper signal definition in the program. 
System locks up.
Various.
Hold down SW-R button on control system 
front panel to bypass program and 
communicate directly with processor. Refer to 
"Troubleshooting Communications" for more 
details. Refer also to the "Troubleshooting Non-
Functioning Units" procedures following this 
table.
A/V system device 
does not respond.
Serial port not placed 
properly.
Verify serial cables are tightened.
Used wrong serial port.
Verify that proper serial port is defined. 
Serial cable miswired.
Verify that serial cable is wired correctly for RS-
232, 422, 485.
 
Troubleshooting Non-Functioning Units 
Perform the following procedure to correct system lock-up problems that are not 
resolved via the procedures in “Setting Network IDs in D3 Pro” on page 21
1.  Connect a DB9 straight-through RS-232 cable between the PAC2 and a 
PC. Refer to “Establishing Communication with the PAC2” on page 19 
for more information. 
Operations Guide – Doc. 5941 
Professional Automation Computer: PAC2  
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