Programming
248083336-1 Rev 3 4-5
RS-232 via USB Communications
The instrument uses RS-232 via USB communications in a single
instrument configuration.
RS-485 Port
The instrument’s RS-485 port RJ-45 connector uses RS-485 MODBUS
ASCII protocol.
WARNING:
Be
advised that +24 VDC is
present on pin 7 of the
RS485 port.
RS-485 Communications
In order to use the RS-485 protocol with a PC computer, an RS-485
converter must be used in a 2-wire configuration where ChB+ goes to
RJ-45 pin 4 and ChA- goes to RJ-45 pin 5. This does not apply if the
unit is installed onto an RS-485 network. Please refer to “RS-485
Communications” on page 3-6 and Figure 3-6 on page 3-8 for
information about the LWS RS-485 converter kit and its use with the
REMOTE 3104P or 5104P. Please contact your Lighthouse Sales
Representative for this kit.
Configuring
with REMOTE
Display
The instrument can be configured using the REMOTE Display
touchscreen interface.
Please refer to the REMOTE Display Operating Manual, LWS PN
248083285-1, for detailed information.
Configuring
with the
MODBUS
Protocol
Alternatively, the instrument can be configured using the MODBUS
protocol.
To start sampling, send the command 11 to command register 40002.
The instrument will begin sampling using the default configuration:
• Location = 0
• Sample Time = 60 seconds
Note:
For the full
MODBUS register map,
please refer to Appendix A.
• Hold Time = 0 seconds
• Initial Delay = 0 seconds
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 12 to command register
40002.
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