Compaible with:
- Back-UPS Office (serial) BF350, BF500
The BackUPS ES has a straight through serial cable with no identification on the plugs.
computer ----------- BackUPS-ES ----------------- DB9-M DB-9F pin signal pin 4 DSR -> 4 --+ | diode resistor 6 DTR -> 6 --+---->|----///---o kill power 1 DCD <- 1 --+ | 2 RxD <- 2 --+----------------+--o low battery | 7 RTS -> 7 --------+--///--+ | +--///--+ | 8 RI <- 8 --+----------------+--o on battery | 9 CTS <- 9 --+ 5 GND --- 5 ----------------------o ground 3 TxD 3 nc