This was originally posted on APC forums on 11/27/2007
Does anyone know what communictions code APC uses on some of the smaller UPS?
This was originally posted on APC forums on 1/28/2008
Depends on the model.
Units that specifies the 940-0024C cable uses simple serial communication and we call it "Smart Protocol" however, I'm not sure if thats the phrase APC-MGE use officially. Do a bit of searching on the net and you'll find them. The forums' ToS doesn't allow me to discuss the contents or directly link you to it. Only thing I recommend is that avoid sending the character "1" and you're pretty much safe from firmware corruption.
Units before Smart Protocol days used simple electrical open collector signaling and the pin-out should be available in older APC (early 90s) manual which is available on APC site. Look for BK400, BK650, etc.
The contents of this post don't reflect the opinion of APC-MGE.
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