Lighthouse RLPC 0.1m, Operating Manual

Page: 73 / 118

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248083227-1 Rev 8 7-1
7
Programming with
MODBUS Protocol
The RLPC can be programmed using the MODBUS Protocol. The full
protocol is detailed in
Appendix B: “RLPC MODBUS Register Map
v1.44” on page B-1 .
This chapter contains the information needed to program the basic
configuration for the instrument using the MODBUS protocol.
DIP Switches
During power-up and reset, the counter reads the DIP switches on the
back panel.
Note:
When changing
the DIP switch settings, the
instrument power must be
cycled off and on.
DIP Switches 7 and 8 must both be in the OFF position in order to use
the MODBUS protocol.
Protocol
Settings
The MODBUS Protocol is defined through an RS232 or RS485
interface with:
• Baud Rate: 19200
• Data Bits: 8
• Stop Bits: 1
• Parity: None
• Flow Control: None
Power On/
Auto Start
When powering up the instrument, it will begin sampling using the
default configuration:
• Location = 0
• Sample Time = 60 seconds
• Hold Time = 0 seconds
• Alarm Channel = Enabled
Note:
The automatic
starting of the sampling
accommodates systems
that do not send a START
command, but just polls
the instrument for its data.
To stop the sampling, send the command 10 or 12 to command register
40002.
Stopping the sampling will set the Device Status bit in Register 40003
to 0.