CKM-MR52-S3 Hardware Installation Manual
24-10707-198 Rev. –
11
SPECIFICATIONS
Use this interface in low voltage, Class 2 circuits only.
Table 4: CKM-MR52 Specifications
Category Description
Primary Power 12 to 24 VDC ±10%, 550 mA maximum
Outputs Six Form-C relays:
Normally open contact (NO) contact: 5 A @ 30 VDC resistive
Normally closed contact (NC) contact: 3 A @ 30 VDC resistive
Inputs 8 unsupervised/supervised, standard EOL: 1k/1k ohm, 1% 1/4 watt
2 unsupervised, dedicated for cabinet tamper and UPS fault
monitoring
Reader Interface
Reader Power 12 VDC ±10% regulated, 300 mA maximum each reader
(jumper selectable and input voltage (VIN) must be 20 VDC
minimum), or
12 to 24 VDC ±10% (input voltage passed through) 300 mA
maximum each reader
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 inputs or 2-wire RS-485
Communication
Communication 2-wire RS-485: 9600, 19200, 38400 or 115200 bps
Cable Requirements
Power 1 twisted pair, 18 AWG.
RS-485 24 AWG, 120 ohm impedance, twisted pair with drain wire and shield,
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) 18 AWG, 6 conductor, 500 ft (150 m) maximum
Reader data
(RS-485)
I/O Devices
24 AWG, 120 ohm impedance, twisted pair with drain wire and shield,
4,000 ft (1,219 m) maximum
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