Lighthouse Remote 2014P, Operating Manual

Page: 53 / 80

MODBUS Register Map v1.48
248083408-1 Rev 1 A-1
A
MODBUS Register
Map v1.48
COMM
Settings
Lighthouse particle counters with MODBUS have the following
communications settings:
The MODBUS slave address is set on the particle counter. Valid
addresses are 1-63. Address 0 is the broadcast address.
Supported
MODBUS
Commands
See www.modbus.org for documentation on how to use these
commands.
Table A-1 MODBUS Communications Settings
Baud Rate
19200
Data Bits
8
Stop Bits
1
Parity
None
Hardware Protocol
RS-232C or RS-485 Standard
Software Protocol
MODBUS ASCII (supports upper/lower case)
Table A-2 MODBUS Registers
Hex Command Description
03 Read Holding Registers
04 Read Input Registers
06 Write Single Holding Register