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248083317-1 Rev 4 B-1
B MODBUS Register
Map v1.44
COMM
Settings
Lighthouse particle counters using MODBUS require the following
communications settings:
The MODBUS slave address is set on the particle counter.
Supported
MODBUS
Commands
See www.modbus.org for documentation on how to use these
commands.
Table B-1 MODBUS Communications Settings
Baud Rate 19200
Data Bits 8
Stop Bits 1
Parity None
Hardware Protocol RS232C or RS485 standard
Software Protocol MODBUS ASCII (supports upper/lower case)
Table B-2 MODBUS Registers
Hex Command Description
03 Read Holding Registers
04 Read Input Registers
06 Write Single Holding Register
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