RLE LD5100 - Manual (Page 61)

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A
P P E N D I X
C HAPTER 0
L
EAK
D
ETECTION
M
ODBUS
M
ASTER
This feature allows the LD5100 to act as a Modbus master, so it can talk to other RLE distance
read panels. Up to 11 RLE distance read panels can be connected to the EIA-485 port#1 on the
LD5100. The system status can be viewed by using the view zones menu. The LD5100 will
display leak, cable break, cable contamination, and loss of communications alarms from the
slave units connected to it.
B.1. Connecting Distance Read Panels to the LD5100
When using the LD5100 as a Modbus master, the slave unit(s) must be wired to the EIA-485
port #1 (TB3). Port #2 (TB2) on the LD5100 can only be used as a Modbus slave output.
Using a two wire configuration, connect the slave units in a 485 daisy chain. You will have to
set the EIA-485 slave address in each Leak detection unit. The first unit connected must be set
to address 2. The following units will increase in numeric order by one unit (e.g., the next unit
would be set to address 3, the following would be set to address 4, etc.; see Figure B.1.)
Figure B.1 LD5100 Connection Diagram