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ADDITIONAL UPS FEATURES
EATON
Powerware
®
9125 Two-in-One UPS (2500/3000 VA) User’s Guide
S
164201374 Rev D
www.powerware.com
47
Table 3. 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 (default) or On Bypass relay
contact (jumper-selectable)
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
The On-Bypass Relay Contact.
You can enable the On-Bypass relay using
the jumper on the Single-Port Card. The jumper default is disabled.
To enable the On-Bypass relay:
1.
Remove the Single-Port Card on the UPS rear panel. Retain the
screws (see Figure 36).
Figure 36. Removing the Single-Port Card
2.
Move the J3 jumper to the AS/400
®
position to enable the
On-Bypass relay, as shown in Figure 37.