RS-232 port
To establish communication between the UPS and a computer, connect one end of
the serial communication cable that comes with the UPS to the RS-232 port on the
UPS. Connect the other end of the serial cable to the RS-232 port on a computer.
The cable pins for the RS-232 connector are identified in the following illustration.
The pin functions are described in Table 11.
RS-232
connector
5
4
3
2
1
9
8
7
6
Table 11. RS-232 connector pin assignments
Pin
Signal name
Function
Direction from the UPS
1
Unused
Not applicable
2
Tx
Transmit to external device
Out
3
Rx
Receive from external device
In
4
Unused
Not applicable
5
GND
Signal common (tied to
chassis)
Not applicable
6
Unused
Not applicable
7
Unused
Not applicable
8
Unused
Not applicable
9
Unused
Not applicable
Note:
Unused pins must remain free on all models.
44
11000 VA UPS and 11000 VA EBM: Installation and Maintenance Guide
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