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Specifications 39
Pin
number
Signal
name
Function Direction from the UPS
1 Low batt
Low battery relay contact; 20 mA, 30 Vdc
contact rating
Out
2 TxD Transmit to external device Out
3 RxD Receive from external device In
4 DTR PnP from external device (tied to Pin 6) In
5 GND Signal common (tied to chassis) —
6 DSR To external device (tied to Pin 4) Out
7 — No connection —
8 AC fail
AC fail relay contact; 20 mA, 30 Vdc contact
rating
Out
9 — No connection —