SU, SUA, SUM, and SURT models use a DB9 to DB9 Serial cable. Do not connect the serial cable if it is not marked with one of these part numbers. APC Serial Cables will always have part number clearly marked on the connector end of the cable. Resolution: Always make sure a proper APC Serial Cable is being used. This is due to the proprietary pinout of APC Smart-UPS serial cables. Quote Why does a Smart-UPS turn off when a standard serial cable is attached? Issue: Why does a Smart-UPS turn off when a standard serial cable is attached? Product Line: Smart-UPS Environment: All Smart-UPS models, All Serial Numbers Cause: 1 A Smart-UPS will turn off if a standard serial cable is connected.
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