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10
Communication Interfaces
10.1
Remote Contacts
The remote contacts interface is provided as a set of solid state switching devices. The switches are available
through a DB9 male connector on the door of the UPS. The following chart shows the pin assignment for
each signal.
MAXIMUM CURRENT CARRYING CAPACITY
OF THE SWITCH
Voltage
30 Vdc peak
30 V rms
(42 Vac peak)
NOTE:
Pin switches are shown in their inactive states. For example, if battery voltage is low, pin 7 will be connected to pin 5.
Pin number 3 is not used.
4300 Series Installation and Operation Manual
Current
70 mA peak
50 mA rms
(70 mA peak)
5
System Common
6
Bypass Active
7
Battery Voltage Low
8
UPS On-Line
4
Battery Discharge
9
1
Fault Signal Detect
2
TABLE 10.1 - COMMUNICATION INTERFACE
DB9 MALE CONNECTOR OUTLINE
(FACING CONNECTOR)
27
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