2.1.1 Jumpers and jacks
The LP4502 processor hardware interface is configured using jumpers to setup the reader port power and
end of line termination.
Jumpers
Set at
Description
J2
N/A
10 Base-T/100Base-Tx Ethernet connection (Port 0).
J5
OFF
Port 2 RS-485 EOL terminator is OFF.
ON
Port 2 RS-485 EOL terminator is ON.
J7
Reader power select. See caution below.
12V
12 V DC at reader ports.
PASS
VIN "Pass Through" to reader ports.
J6
N/A
Micro USB port (2.0)
J8
N/A
microSD card
J9
OFF
Port 1 RS-485 EOL terminator is OFF.
ON
Port 1 RS-485 EOL terminator is ON.
J10-1
N/A
Remote Status LED #1.
1
J10-2
N/A
Remote Status LED #2.
1
J10-3
N/A
Remote Status LED #3.
1
J10-4
N/A
Remote Status LED #4.
1
J19
OFF
Backup battery is OFF.
ON
Memory and real time clock backup battery
1. Observe polarity connection to LED. External current limiting is not required.
Caution:
Install jumper J7 in the 12 V position
ONLY
if the input voltage (VIN) is greater than 20 V DC. Failure
to do so may damage the reader or LP4502.
PLT-05246, A.4
9
June 2021
Powering
Trusted Identities
HID Mercury™ LP4502 Controller
Installation and Specifications
