Emerson Liebert GXT-MT - 6 Operating Modes; 7 Communication Port

Liebert GXTMT Series Installation and User Manual
1-3 kVA UPS
Page １６ V2.11 Emerson Network Power
7. Communication Port
RS232 Interface
The following is the pin assignment and description of DB-9 connector.
Pin # Description I/O
2 TXD Output
3 RXD Input
5 GND Input
AS400 Interface (Option)
Except for the communication protocol as mentioned above, this series UPS has AS400 card (an
optional accessory) for AS400 communication protocol. Please contact your local distributor for
details. The following is the pin assignment and description of DB-9 connector in AS400 card.
Pin #
Description I/O
1 UPS Fail Output
2 Summary Alarm Output
3 GND Input
4 Remote Shutdown Input
5 Common Input
6 Bypass Output
7 Battery Low
Output
8 UPS ON Output
9 Line Loss Output
Figure 16.2: DB-9 Interface of AS400
communication
p
rotocol
Communication Port