Mercury Security © 2018 MR50-S3 DOC 10107-0009 REV 2.06 Page 5
Reader Interface:
Reader power: 12 to 24 Vdc ± 10% (input voltage passed through)
Reader LED output: TTL compatible, high > 3 V, low < 0.5 V, 5 mA source/sink maximum
Buzzer output: Open collector, 12 Vdc open circuit maximum, 40 mA sink maximum
Data Inputs: TTL compatible, F/2F or 2-wire RS-485
Communication: 2-wire RS-485: 9600, 19200, 38400 or 115200 bps
Cable Requirements:
Power: 1 twisted pair, 18 AWG
RS-485 I/O devices: 1 shielded twisted pair, 24 AWG, 120 ohm impedance, 4,000 ft.
(1,219 m) maximum
Alarm Inputs: 1 twisted pair per input, 30 ohms maximum
Outputs: As required for the load
Reader data (TTL): 6-conductor, 18 AWG, 500 ft. (150 m) maximum
Reader data (F/2F): 4-conductor, 18 AWG, 500 ft. (150 m) maximum
Reader data (RS-485): 1 shielded twisted pair, 24 AWG, 120 ohm impedance, 2,000 ft.
(610 m) maximum
Mechanical:
Dimension: 4.25 in. (108 mm) W x 2.75 in. (70 mm) L x 1 in. (25.4 mm) H
Weight: 4 oz. (120 g) nominal
Environment:
Temperature: -55 to +85 °C, storage,
-40 to +75 °C, operating
Humidity: 5 to 95 % RHNC
UL294, 6
th
edition Performance Levels: