MGE UPS Systems GES-202L User Manual

15 

Computer Interface Port 
 
The computer interface port has the following characteristics: 
The communication port on the back of the UPS may be connected to a host computer.  This port 
allows the computer to monitor the status of the UPS and control the operation of the UPS.  Its 
major functions include the following: 
 
1.  The ability to broadcast a warning when the power fails. 
2.  The ability to close any open files before the battery reserves are exhausted. 
3.  The ability to turn off the UPS. 
4.  The ability to make the UPS perform a self-test. 
 
Some computers are equipped with a serial connector to link with the communication port, in 
some cases a special plug-in card may be needed. 
 

1.  Pin 5 and 2 are open collector outputs that must be pulled up to a common referenced supply 
no greater than +40VDC. 
2.  The transistors are capable of a maximum non-conductive load of 25mADC, use pin 4 as the 
common. 
3.  Pin 5 generates a High to Low signal when the battery inside the UPS has less than 5 minutes 
back up time left. 
4.  Pin 2 generates a High to Low signal when the line has failed. 
5.  Pin 6 will shut down the UPS is a high is sustained for 0.36 seconds. 
 

6.  Pin 6 is the RS-232 data input from computer (RX) 
7.  Pin 9 is the RS-232 data output to computer (TX). 
8.  Pin 7 is the common or computer ground 
 
NOTE: 
1. Switch rating +40V, 25mADC non-inductive. 
2. Pin 7 should be connected to computer ground only.