Lighthouse REMOTE 3104P, 5104P Operating Manual
3-8 248083336-1 Rev 3
Using the RS-485 Port to Connect to a PC
To use the 3104P or 5104P RS-485 port and protocol to connect to a
computer RS-232 COM port, the LWS RS-485 converter kit must be
used. Please contact your Lighthouse Sales Representative for the RS-
485 converter kit that includes the cables and adapter needed to set this
up. The kit includes a terminator and RJ45 cable that are not required.
To connect the instrument to a computer using this kit:
1. Remove power from the instrument.
2. Connect one end of a standard Cat5 cable to an LWS RS-485
converter.
3. Connect the other end of the Cat5 cable to the RS-485 Port on the
instrument.
4. Connect the RS-232 DB-9 side of the RS-485 converter to a DB-9
Male to DB-9 Female straight through cable. Connect the female
DB-9 to any available COM port on the computer.
5. Power on the instrument. You may refer to Figure 3-6 for parts
identification.
Figure 3-6 LWS RS-485 Converter Kit Example
Make sure that each REMOTE 3104P or 5104P has a unique non-zero
address or a conflict will result and data will be lost. The REMOTE
3104P or 5104P complies with EIA’s RS-485 standards (Table 3-3) for
distances and number of devices on a chain.
RS-485 Converter &
Power Supply
DB9 RS-232 Male-to-Female
Cable
Connect serial cab
to this port
Attach this cable
to the REMOTE
and other end to P
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