Setup and Installation
18 ONePlus UPS User Instruction Manual
Table 1. Pin Signals for Supplied USB Cable
PIN # Signal Name Function Position
1 Low batt
Low battery simulated contact; 20 mA, 30 VDC contact rating
Closes when low
Out
2 RxD Receive from external device and shut down input In
3 TxD Transmit to external device Out
4 — No connection —
5 GND Signal common —
6 AC fail
AC fail, simulated contact, open on fail; 20 mA, 20 VDC
contact rating
Out
7 — No connection —
8 — No connection —
9 AC fail
AC Fail, simulated contact, close on fail; 20 mA, 30 VDC
contact rating
Out
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