For operating systems with basic shutdown capabilities, APC Smart-UPS Serial RS-232 Cable DB9 to RJ45 (RJ50) Interface Kits are available for use with all APC UPSs with dedicated RS-232 serial ports. This 15 feet extension cable lets your UPS send signals over longer distances.
Compatible with
Smart-UPS 5G(Serial) SMX750, SMX1000, SMX1500
Smart-UPS 4.5G(Serial) SMT750, SMT100, SMT1500, SMT2200, SMT3000
Not all units model are listed. Your APC Smart-UPS unit may not list here but it should still work.