February, 2019
eMAX-LP4502-Man
Page 13 of 20
13. Specifications:
The eMAX-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 Vdc ± 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 Vdc, 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 ohm, 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 Vdc resistive
Normally closed contact (NC): 3 A @ 30 Vdc resistive
Reader Interface:
Power:
12 Vdc ± 10 % regulated, 300 mA maximum each reader
(jumper selectable)
(input voltage (VIN) must be greater than 20 Vdc)
or
12 to 24 Vdc ± 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 Vdc 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
