RLE LD2100 V.2.6 - Manual (Page 61)

rletech.com LD2100 User Guide 61
C
H A P T E R
C HAPTER 3
C
ONFIGURE THE
LD2100
AS A
M
ODBUS
M
ASTER
The LD2100 can act as a Modbus master to other RLE distance-read controllers. Up to 31 RLE
distance-read panels can be connected to the EIA-485 port on the LD2100. The system status
can be viewed through the LD2100 web page. The LD2100 will display leak, cable break, cable
contamination, and loss of communications alarms from the slave units connected to it.
4.1. Connecting Distance Read Panels Using the
EIA-485 Port
When using the LD2100 as a Modbus master, the slave units must be wired to the EIA-485 port
(TB4) as follows:
1 Using a two-wire configuration, connect the slave units in a 485 daisy chain.
2 Set the EIA-485 slave address for each leak detection unit:
♦ Set the first unit to address 2.
♦ Increase the address for each subsequent unit in numeric order by one (for example, the
next unit would be set to address 3)
Figure 4.1 EIA-485 Connection Diagram