February, 2018
eMAX-EP4502 - Manual
Page 6 of 11
5. Input Power, Cabinet Tamper and UPS Fault Input Wiring:
The eMAX-EP4502 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
ONLY within the system! Multiple earth ground connections
may cause ground loop problems and is not advised.
Observe POLARITY on 12-24 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-EP4502 controller communicates to the host via the on-board 10-BaseT/100Base-TX Ethernet
interface (port 0).
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 meters). Cable should be single twisted pair with drain wire and shield, 120 ohm
impedance, 24 AWG, 4,000 ft. (1,219 meters) maximum for communication.
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!
TR-
TR+
GND
TB3
TR-
TR+
GND
TB2
Port 1 To Serial I/O Devices
Port 2 To Serial I/O Devices
12 TO 24Vdc
VIN
+
-
CABINET
TAMPER
POWER
FAULT
TB1
TMP
GND
FLT
GND
GND
