3
4. Maximum voltage drop between the panel (or auxiliary power supply) and any
device is 2.0VDC. If the voltage at any device is less than the required level, add
an auxiliary power supply at the end of the circuit. When voltage is too low,
the devices cannot operate properly. Refer to the LX–Bus/Keypad Bus Wiring
Application Note (LT-2031) for more information. Also see the 710 Module
Installation Sheet (LT-0310).
Keypad Specifications
Model
Normal/
Standby
Current
Alarm Current
Four
Zones
Internal
Prox
Reader
Wiegand
Input
Internal
Door
Strike
Relay
7872
130mA + 1.6mA
per active zone
165mA + 2mA
per active zone
X
X
7873
130mA + 1.6mA
per active zone
165mA + 2mA
per active zone
X
X
X
X
Specifications
Operating Voltage
12VDC
Dimensions
5.8” W x 4.135” H x 0.6” D
Compatibility
All keypads are compatible with XR150/XR550 Series and XT30/XT50 Series panels.
Installing the Keypad
Summary of Contents for 7872
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