Keri Systems EP2500 - Manual (Page 3)

Mercury Security Corporation, Copyright 2011 EP2500 DOC 10107-0030 REV: 1.03 Page 3
Information subject to change without notice.
12 TO 24Vdc
GN
D
VIN
+
-
CABINET
TAMPER
POWER
FAULT
TB1
TMP
GND
FLT
GND
4. Communication Wiring:
The EP2500 processor communicates to the host via: on-board Ethernet 10-BaseT/100Base-TX port or
on port 1. Port 1 may be configured as RS-232, 2-wire RS-485 or optional Lantronix Ethernet 10-
BaseT/100Base-TX Micro100 interface. RS-232 interface is for direct one to one connection to a host
computer port, or a modem.
Ports 2 and 3 utilize 2-wire RS-485 interface. The interface allows multi-drop communication on a
single bus of up to 4,000 feet (1,200 m). Use twisted pair (minimum 24 AWG) with shield for the
communication with 120 ohm impedance. Install termination jumpers only on the units at each end of
the communication line.
5. Memory Backup Battery:
The static RAM and the real time clock device are powered by a lithium battery when input power is
removed. This battery should be replaced annually. If the data in the static RAM is determined to be
corrupt after power up, all data, including flash memory, is considered invalid and is erased. All
configuration data must be re-downloaded. Battery type: BR2325, BR2330, or CR2330.
PORT 1 CONFIGURED
as 2-WIRE RS-485
TXD/TR1+
RXD/TR1-
RTS
CTS
GND
PORT 1 CONFIGURED
as RS-232
GND
TXD/TR1+
RXD/TR1-
RTS
CTS
PORT 2
GND
TR3-
TR3+
TR2-
TR2+
GND
GND
TR3-
TR3+
TR2-
TR2+
GND
2-WIRE RS-485
PORT 3
2-WIRE RS-485
3. Input Power, Cabinet Tamper and UPS Fault Input Wiring:
The EP2500 requires 12-24Vdc 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.
Observe POLARITY on 12-24Vdc input!
There are two dedicated inputs for cabinet tamper and UPS fault moni-
toring. Normal (safe) condition is a closed contact. If these inputs are
not used, install a jumper wire.
Bulk Erase Configuration Memory:
Use the bulk erase function to erase all configuration and cardholder databases. When power is applied
with S1 switches set to 1 & 2 ON and 3 & 4 OFF, there is a 10-second window that if switch 1 or 2 is
changed to the OFF position, memory is erased. The LEDs flash the following pattern when in the reset
window: LED 1 & 2 and LED 3 & 4 flash alternately at .5 second rate. When erasing memory, LED 2
flashes at a 2 seconds rate. DO NOT CYCLE POWER. Erasing memory takes approximately 60
seconds. LEDs 1 and 4 flash for 10 seconds after the memory has been erased, then the EP2500 will re-
boot.