Originally Posted By: K447
APC tweaked the port configuration over the years, so not all models had the exact same port configuration. And I think there were different versions of the serial cable too.


Yes, looking at the apcupsd web pages shows there was quite a variety of cables... Until now I was convinced the cable I was using was the original cable that came with the unit, but I can't see any product/manufacturer name or product number on it, and it is supposed to be embossed into the plastic.