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2-Series Integrated Dual Bus Control System 
 
Crestron AV2 & PRO2
 
AV2 & PRO2 Troubleshooting (Continued) 
TROUBLE 
POSSIBLE CAUSE(S) 
CORRECTIVE ACTION 
A/V system device 
does not respond. 
IRP2 or serial port not 
placed properly. 
Verify placement of IRP2 
(hold phosphor card under 
IRP2 while pressing button) 
and tighten serial cables. 
Used wrong IR/serial 
port. 
Verify that proper IR or serial 
port is defined. 
Serial cable not wired 
correctly. 
Verify that serial cable is 
wired correctly for RS-232, 
422, 485. 
 
Device is not receiving 
sufficient power. 
User the Crestron Power 
Calculator to help calculate 
how much power is needed 
for the system. 
NOTE:  If communication cannot be established or the control system is locked-up, 
refer to “Troubleshooting Communications” in the Crestron 2-Series Control System 
Reference Guide (Doc. 6256). 
Network Analyzer 
To assist with troubleshooting, the unit contains Crestron’s patent-pending network 
analyzer to continuously monitor the integrity of the Cresnet network for wiring 
faults and marginal system performance or other network errors. For more 
information on how to use the network analyzer, refer to the Crestron Toolbox help 
file and use the index to search for “Network Analyzer”. 
Battery Replacement 
A Lithium battery is used to power the system clock within the 2-Series integrated 
dual bus control system. Under normal conditions, it will last for approximately 10 
years. In the event that the clock fails, only an authorized technician should replace 
it. Refer to caution statement below. 
CAUTION:  Danger of explosion if battery is incorrectly replaced.  
Replace only with the same or equivalent type recommended by the manufacturer. 
Dispose of used batteries according to the manufacturer's instructions. 
Serial Communication Difficulties with Other 
Devices Connected to the Control System 
NOTE:  The information below pertains to the COM Analyzer. The methods 
described apply to the PRO2 only. For the AV2, use Passthrough Mode. For 
information pertaining to Passthrough Mode, refer to “Passthrough Mode” in the 
Crestron 2-Series Control System Reference Guide (Doc. 6256) 
NOTE:  Only COM-type devices and cards in the SIMPL Windows program that are 
active (not commented out) are monitored. 
Depressing the COM menu function button from the front panel Main Menu (default 
front panel page) displays a listing of all devices and cards that can be monitored. 
The listing follows the same order as the system tree in Configuration Manager. The 
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  2-Series Integrated Dual Bus Control System: AV2 & PRO2 
Operations Guide – DOC. 5957B