Wire a Door Controller (ADC-ACC1-17) to an Access Control expansion board
Reader port 1 can support up to eight Alarm.com expansion modules using a 2-wire RS-485 bus. The maximum cable length is 2,000 feet. (610 meters). When powering expansion modules and peripherals from the ADC-ACC1-17, be cautious not to exceed 650 mA @ 12V DC. Cable gauge must also be evaluated.
Important: Each expansion module must also be wired for power (VIN to + 12VDC / GND to - 12VDC).
Expansion board wiring
