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Crestron ST-COM 
 
RS-232/422/485 COM Module
 
assignment is taken care of by the compiler. If the tx$ is defined, it can be driven by 
other string creation symbols (i.e., an Analog to Serial). If rx$ is defined, it can be 
routed to other string processing symbols (i.e. Serial Gather). Another typical usage 
would be if a macro were to drive the port, then the tx$ and rx$ would come from/go 
to the macro definition. Refer to help topics from the Help pull-down menu in 
SIMPL Windows. Search for Analog to Serial or Serial Gather for details.  
Problem Solving 
Troubleshooting 
The table below provides corrective action for possible trouble situations. If further 
assistance is required, please contact a Crestron customer service representative.  
ST-COM Troubleshooting 
TROUBLE
POSSIBLE 
CAUSE(S)
CORRECTIVE ACTION
PWR LED 
does not 
illuminate.  
ST-COM is not 
receiving power. 
Confirm that power pack is securely plugged into 
outlet and that the connector is properly attached to 
the ST-COM. Since the ST-CP does not supply 
power, an external power pack must be used.
Verify that proper cables are securely attached to   
ST-COM NET connectors (for Cresnet system 
NET LED 
does not 
Improper NET 
ID.
Verify that ST-COM NET ID matches NET ID 
software program. Refer to "Identity Code".
illuminate.  Loose network 
connection.
Verify that cables attached to ST-COM NET 
connectors are proper and secure.
 
Further Inquiries 
If after reviewing this Operations Guide for the ST-COM, you can not locate specific 
information or have questions, please take advantage of Crestron's award winning 
customer service team in your area. Dial one of the following numbers.  
•  In the US and Canada, call Crestron’s corporate headquarters at  
1-888-CRESTRON [1-888-273-7876] or 1-201-767-3400.  
•  In Europe, call Crestron International at +32-15-50-99-50. 
•  In Asia, call Crestron Asia at +852-2341-2016. 
•  In Latin America, call Crestron Latin America at +52550-5093-2160. 
•  In Australia, call Crestron Pacific at +613-9480-2999. 
For local support from exclusive Crestron factory-trained personnel in New Zealand 
call Amber Technologies at +649-410-8382. 
 
Operations Guide - DOC. 5695A 
RS-232/422/485 COM Module: ST-COM  
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