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power environment. If a power emergency occurs, the software initiates the saving of all
data and an orderly shutdown of the connected critical load.
The cable pins are identified in Figure 10–2 and the pin functions are described in
Table 10–1.
Figure 10–2. The Communication Port on the Single Port Serial Card
Pin Number
Function
1
Low Battery Open Collector signal – pulls to common
when the UPS reaches low battery level
2
RS-232 Transmit Data
3
RS-232 Receive Data
4
Plug and Play sense
5
Signal Common (tied to chassis)
6
Tied internally to pin 4
7
No Connection
8
AC Fail Open Collector signal – pulls to common during
a power failure
9
DC Supply Voltage (+8 to 24 volts DC power)
Powerware 9335 (80 kVA and120 kVA) Installation and Operation
164201396 REV. A 071103
5
9
Table 10–1. Communication Port Pin Assignments
4
3
2
8
7
1
6
Input or Output
Output
Output
Input
Input
–
Output
–
Output
Output
10-3
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