Keri Systems MR50 - Manual (Page 4)

Mercury Security Corporation © 2014 MR50 DOC 10107-0009 REV 2.03 Page 4
4. Status LEDs:
Power-up: All LED’s OFF.
Initialization: Once power is applied, initialization of the module begins.
The A LED is turned ON at the beginning of initialization.
Run time: After a successful initialization, the LEDs have the following meanings:
A LED: Heartbeat and On-Line Status:
Off-line: 1 second rate, 20% ON
On-line:
Non-encrypted communication: 1 second rate, 80% ON
Encrypted communication:
.1 S ON, .1 S OFF, .1 S ON, .1 S OFF, .1 S ON, .1 S OFF, .1 sec ON, .3 S OFF
A LED Error Indication:
Waiting for application firmware to be downloaded: .1 S ON, .1 S OFF.
B LED: SIO Communication Port Status:
Indicates communication activity on the SIO communication port
5. Specifications:
The Interface is for use in low voltage, class 2 circuits only.
Primary Power: 12 to 24 Vdc ± 10%, 150 mA maximum (plus reader current)
12 Vdc @ 110 mA (plus reader current) nominal
24 Vdc @ 60 mA (plus reader current) nominal
Outputs: 2, Form-C contact relays: K1: 5 A @ 30 Vdc, K2: 1 A @ 30 Vdc
Inputs: 2 unsupervised/supervised, standard EOL, 1k/2k ohm, 1% 1/4 watt
1 unsupervised, dedicated for cabinet tamper
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, 5 Vdc open circuit maximum, 10 mA sink maximum
Data Inputs: TTL compatible, mag stripe and Wiegand standards supported.
RS-485 Mode: 9600 bps, asynchronous, half-duplex, 1 start bit, 8 data bits, and 1
stop bit. Maximum cable length: 2000 ft (609.6m)
Communication: 2-wire RS-485: 9600, 19200, 38400 or 115200 bps
Cable Requirements:
Power: 18 AWG, 1 twisted pair
RS-485 I/O devices: 24 AWG, 120 ohm impedance, twisted pair with shield, 4,000 ft
(1,219 m) maximum
Alarm Inputs: 1 twisted pair per input, 30 ohms maximum, typically 22 AWG @
1000 ft (304.8 m)
Outputs: As required for the load
Reader data (TTL): 18 AWG, 6 conductor, 500 ft (150 m) maximum
Reader data (RS-485): 24 AWG, 120 ohm impedance, twisted pair with shield, 2,000 ft
(609.6 m) maximum
Mechanical:
Dimension: 4.25 in (108 mm) W x 2.75 in (70 mm) L x 1 in (25.4mm) H
Weight: 4 oz. (120 g) nominal