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KnowledgeBase: Tips for Using Unison Serial Access Protocol with Crestron AMX Systems?

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First published by:
Kelsey Aleckson
on 06-25-2009
Last revision by:
Kelsey Aleckson
on 07-22-2009
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KnowledgeBase: Tips for Using Unison Serial Access Protocol with Crestron AMX Systems? This page is locked to prevent further edits

In order for Crestron or AMX systems to send a variably-encoded serial string (like a Unison Serial Access Protocol string), special characters are required before each hex value in the string. If you do not add the special characters, the control systems assume the string is ASCII and send it incorrectly. ASCII values do not need any added information.

Example:
Trying to send a command to activate Preset 1 in Room 1 

USAP Command (generated by USAP Test Utility):
 
ee17000040Room 1.Preset 1.ACTI0000
Crestron (Crestron needs to see a \x before each individual hex value in order to send it.)
 
\xee\x17\x00\x00\x40Room 1.Preset 1.ACTI\x00\x00

AMX (AMX/Panja adds a $ before each Hex Value.)
 
$ee$17$00$00$40Room 1.Preset 1.ACTI$00$00

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