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ADDITIONAL UPS FEATURES
Eaton 5125 Tower UPS (1000–2200 VA) User's Guide
S
05147304 Rev C
www.eaton.com/powerquality
37
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