Laurel Electronics Custom ASCII Protocol For Laureate Series 2 Digital Panel Meters, Counters, Timers & L-Series Transmitters User Manual

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4. JUMPER SETTINGS & FIELD WIRING

1. SAFETY WARNINGS

Digital panel meters, counters, timers and transmitters may be powered with AC (mains) from
85-264 Vac or 95-300 Vdc with standard high voltage power, or 12-34V ac or 10-48 Vdc with the
low voltage power supply option. To avoid the possibility of electrical shock or damaging short
circuits, always unplug the device before opening the case. Please refer to the respective device
manuals for full safety information and instruction on how to open the case. Signal wiring changes
external to the case can be made safely while the units are under power.

2. JUMPERS ON SERIAL METER BOARDS

USB Board &
Basic Ethernet Board

No jumpers needed.

RS232 Board

e - Normal operation.
f - Slave display to RS232 from another meter.

g - Pull-up resistor on RTS line.

Note: Board is shipped with jumpers e and g installed

RS485-Modbus Board, Full Duplex Operation

b & e - Bias jumpers should be installed on 1 board.
a & d - Installed on last meter in long cable run.

RS485-Modbus Board, Half Duplex Operation

b & e - bias jumpers installed on 1 board.
c & f - installed for half duplex operation.
a - installed on last meter in line with long cable runs.

Note: Board is shipped with no jumpers installed.

Modbus

RJ45

RS485 Board, Full Duplex Operation

b & d - Installed on last meter in long cable run.

RS485 Board, Half Duplex Operation

a & c - Installed for half duplex operation.
d - Installed on last meter in line with long cable runs.

Note: Board is shipped with no jumpers installed.