RLE LD2000 - Manual (Page 65)

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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 LD2000 to act as a Modbus master to other RLE distance read panels.
Up to 15 RLE distance read panels can be connected to the EIA-485 port on the LD2000. The
system status can be viewed by using the home webpage. The LD2000 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 LD2000
(EIA-485 Port)
When using the LD2000 as a Modbus master, the slave unit(s) must be wired to the EIA-485
port (TB4). 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 LD2000 EIA-485 Connection Diagram