Lighthouse Worldwide Solutions REMOTE 1100, Руководство по эксплуатации

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Lighthouse REMOTE 1100/1104 Operating Manual
4-4 248083363-1 Rev 4
Communicating
with the
Instrument
The RJ-45 port shown on the instrument in Figure 4-1 has RS-232
capabilities and may be used to connect the unit to a desktop or laptop
PC COM port when the distance to the instrument is equal to or less
than 50 feet. It is, however, specifically designed to connect the
REMOTE 1104 to an RS-485 network. .
RS-485 Port
The instrument uses the Modbus ASCII protocol.
RS-485 Configuration
In order to connect a PC computer to an RS-485 network, an RS-485 to
USB adapter or an RS-485 to RS-232 converter (2-wire configuration -
ChB+ to RJ-45 pin 4 and ChA- to RJ-45 pin 5) must be used. This does
not apply if the
R1104 is installed onto an RS-485 LAN that has the
needed support hardware, such as an LWS RS-485 Gateway , to provide
PC access. Please refer to “RS-485 Communications” on page 3-8 for
information about the
LWS USB-to-RS-485 adapter and its use with
the REMOTE 1104 . Please contact a Lighthouse Sales Representative
for this kit.
Configuring
with the
Modbus
Protocol
The instrument can be configured using the Modbus protocol. It is best
to use a software, such as
LMS Express , to communicate with the
instrument, rather than using a single-command-line communication
software, such as
HyperTerminal . LMS Express maintains the almost
constant communication link that Modbus devices require when in a
non-TCP environment.
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.