February, 2019
eMAX-LP4502-Man
Page 8 of 20
5. Input Power, Cabinet Tamper, and UPS Fault Wiring:
The eMAX-LP4502 requires 12 to 24 Vdc power. Locate power source as close to the unit as
possible. Connect power with minimum of 18 AWG wire.
Connect the GND signal to earth ground in ONE LOCATION
within the system! Multiple earth ground connections may
cause ground loop problems and is not advised.
Be sure to observe POLARITY on 12 to 24 Vdc input!
There are two dedicated inputs for cabinet tamper and UPS fault
monitoring. Normal (safe) condition is a closed contact. If these
inputs are not used, install a jumper wire.
6. Communication Wiring:
The eMAX-LP4502 controller communicates to the host via the on-board Ethernet 10-
BaseT/100Base-TX port, and/or the USB port (2.0) with an optional USB to Ethernet adapter.
The Serial I/O device communication ports, TB2 for port 1 and TB3 for port 2, are 2-wire RS-485
interface which can be used to connect additional I/O panels. The interface allows multi-drop
communication on a single bus of up to 4,000 feet (1,219 m). Use 1-twisted pair, shielded cable, 120
ohm impedance, 24 AWG, 4,000 ft. (1,219 m) maximum for communication.
TR-
TR+
GND
TB3
TR-
TR+
GND
TB2
Port 1 To Serial I/O Devices
Port 2 To Serial I/O Devices
IMPORTANT NOTE!
Install the termination jumper ONLY on the panel at each end of the RS-
485 bus. Failure to do so will compromise the proper operation of the communication channel!
7. Reader Wiring:
Each Reader Port of the eMAX-LP4502 supports a reader with TTL/Wiegand (D1/D0), TTL/Magnetic
Stripe (Clock/Data), F/2F (standard or supervised) or 2-wire RS-485 OSDP signaling. Power to the
readers is selectable: 12 Vdc (VIN must be greater than 20 Vdc), or power is passed-through (PASS)
from the input voltage of the LP4502 (TB1-VIN), 300 mA maximum per reader port. Readers that
require different voltage or have high current requirements must be powered separately. Refer to the
reader manufacture specifications for cabling requirements. In the 2-wire LED mode the buzzer
output is used to drive the second LED. Reader port configuration is set via the host software. Do
not terminate any RS-485 devices connected to a reader port.
To fully utilize each reader port:
➢
TTL signaling requires a 6-conductor cable (18 AWG)
➢
F/2F signaling requires a 4-conductor cable
➢
RS-485 signaling requires two 2-conductor cables. Use one cable for power (18 AWG) and
one cable for communication (24 AWG Twisted Pair, with drain wire and shield).
12 TO 24 Vdc
GND
VIN
+
-
CABINET
TAMPER
POWER
FAULT
TB1
TMP
GND
FLT
GND