APC AP9607 User Manual

30

The following limitations and capabilities apply to the Basic 
ports of the Interface Expander:

• Pins 3, 5, and 6 are open collector outputs which must 

be pulled up to a common referenced supply no 
greater than +

40 VDC

. The transistors are capable of 

a maximum non-inductive load of 25 mA. Use only 
Pin 4 as the common.

• The output at Pin 2 generates a low-to-

high RS-232

 

level when the device is signaling an On Battery con-
dition. The pin is normally at a low 

RS-232

 level.

• The Interface Expander unit may be signaled to shut 

down the 

UPS

 by applying a high 

RS-232

 level to Pin 

1 for 4.5 seconds. Shutdown is also dependent on the 

UPS

 status and the Interface Expander shutdown