Modbus Channel Inputs - Prosense DPX Series User Manual

5.4 MODBUS Channel Inputs:

DPX Series Gas Control Panel has two MODBUS channel input ports on main board:
MODBUS Channel pin details are given in table XX:
Socket Label SW name
RS485-A MODBUS Line 1
VOUT-A Power Output Line 1
RS485-B MODBUS Line 1
VOUT-B Power Output Line 2
DPX Series Gas Control Panel is a master device in the MODBUS Network and it initiates the
communication with a "query" to "Slave" devices which are detectors. The "Slave " which is
constantly monitoring the network for "Queries" will recognise only the "Queries" addressed
to it and will respond by returning a "response". The connection topology will be as follows:
PRS-UM-DP-X-EN-Rev1.0-17.11.2021
Diagram 13: MODBUS Channel Inputs
Pins Pin definitons
GND Ground for MODBUS connection
A A Line for MODBUS communication
B B Line for MODBUS communication
+ V+ to supply detector power on Line 1
- V- to supply detector power on Line 1
GND Ground for MODBUS connection
A A Line for MODBUS communication
B B Line for MODBUS communication
+ V+ to supply detector power on Line 2
- V- to supply detector power on Line 3
Table 8: MODBUS Channel pin definitions
Diagram 14: MODBUS Communication
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