Bosch AMC-4W Installation Manual page 26

Installing the AMC-4W Access Controller AMC-4W
When using a shared 12 VDC power supply for internal electronics and
peripherals, pin 1 and pin 6 resp. pin 3 and pin 7 can be shortened.
If an uninterruptible power supply (UPS) is used, the relay output for power
good signals from the UPS is connected to pin 4 and pin 5. Otherwise these two
pins must be short-circuited.
26 Installation Guide Bosch Security Systems | V.3.1/2006-09