The LP4502 is for use in low voltage, Class 2 Circuits only
The installation of this device must comply with all local fire and electrical codes.
Primary power
12 to 24 V DC ± 10 %, 550 mA maximum (reader and USB current not included)
Reader ports
600 mA maximum (add 600 mA to primary power current)
Micro USB port
5 V DC, 500 mA maximum (add 270 mA to primary power current)
Memory and clock backup
battery
3 Volt Lithium, type BR2330 or CR2330
microSD card
Format: microSD or microSDHC; 2GB to 8GB.
Host communication
Ethernet: 10Base T/100Base-TX and micro USB port (2.0) with optional adapter:
pluggable model USB2-OTGE100
Serial I/O device
Two each: 2-wire RS-485, 2,400 to 115,200 bps, asynchronous, half-duplex, 1 start bit, 8
data bits, and 1 stop bit
Inputs
Eight unsupervised/supervised, standard EOL: 1k/1k
Ω
, 1%, ¼ watt
Two unsupervised dedicated for cabinet tamper and UPS fault monitoring
Output
Four relays, Form-C with dry contacts
Normally open contact (NO): 5 A @ 30 V DC resistive
Normally closed contact (NC): 3 A @ 30 V DC resistive
Reader interface
Power
(jumper selectable)
12 V DC ± 10% regulated, 300 mA maximum each reader
(input voltage (VIN) must be greater than 20 V DC)
or
12 to 24 V DC ± 10% (input voltage (VIN) passed through), 300 mA maximum each
reader
Data inputs
TTL compatible, F/2F or 2-wire RS-485
RS-485 mode
9,600 to 115,200 bps, asynchronous, half-duplex, 1 start bit, 8 data bits, and 1 stop bit.
Maximum cable length: 2000 ft. (609.6 m)
LED output
TTL levels, high>3 V, Low<0.5 V, 5 mA source/sink maximum
Buzzer output
Open collector, 12 V DC open circuit maximum, 40 mA sink maximum
Cable requirements
Power and relays
1 twisted pair, 18 to 16 AWG
Ethernet
CAT-5, minimum
Reader data (TTL)
6-conductor, 18 AWG, 500 feet (150 m) maximum
Reader data (F/2F)
4-conductor, 18 AWG, 500 feet (150 m) maximum
Reader data (RS-485)
1 twisted pair, shielded. 24 AWG, 120
Ω
impedance, 2,000 feet (610 m) maximum
RS-485 I/O devices
1 twisted pair, shield. 120
Ω
impedance, 24 AWG, 4,000 ft. (1,219 m) maximum
Alarm input
1 twisted pair, 30
Ω
maximum, typically 22 AWG @ 1000 ft. (304.8 m)
PLT-05246, A.4
20
June 2021
Powering
Trusted Identities
HID Mercury™ LP4502 Controller
Installation and Specifications
