Lighthouse Handheld 2016 - Appendix C HANDHELD MODBUS Register Map V1.48; COMM Settings; Supported MODBUS Commands

00
248083400-1 Rev 7
C-1
C HANDHELD
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 C-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 C-2 MODBUS Registers
Hex Command Description
03 Read Holding Registers
04 Read Input Registers
06 Write Single Holding Register