Eaton 5125 - Additional UPS Features; Communication Port Pin Assignments

ADDITIONAL UPS FEATURES
Eaton 5125 Tower UPS (1000–2200 VA) User's Guide S 05147304 Rev C www.eaton.com/powerquality
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Table 1. Communication Port Pin Assignment
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 (Plug and Play) 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 RTS PnP from external device In / Out
8 AC Fail AC Fail relay contact; 20 mA, 30 Vdc contact rating Out
9 Power Source +V (8 to 24 volts DC power) Out