Lighthouse SOLAIR 3350, Operating Manual

Page: 61 / 184

Communications
248083387-1 Rev 10 5-3
RS485 Communication
WARNING:
This
instrument will be damaged
and its warranty voided if
the design of the RS485
port is defeated to allow
daisy chaining. The port is
designed for a star
configuration only, where
the instrument is the
termination of a single
cable run between it and a
PC or hub.
The instrument uses RS485 as one of its communication modes.
Attaching the instrument to an RS485 network requires special
attention to topology (wiring scheme of network) before and after the
design phase to make sure the SOLAIR 1.0 CFM and other instruments
perform as expected.
A standard Cat5 cable is used to connect the instrument to an RS485
network. Table 5-1 illustrates the RS232/RS485 RJ45 pins and the
signals assigned.
RS232 Communication
The instrument can use RS232 as a communication mode by using the
USB to RS232 Converter cable. The cable is connected to the RJ-45
Comm Port on the Solair and to any USB port on a PC.
Windows will detect that a new hardware device has been attached and
will finalize the installation as needed. This is a routine “registering” of
components that should only take a moment. An additional COM port
will be added to the PC.
USB Communication
The SOLAIR provides point-to-point communications via the USB
Port.
If it hasn’t been done, yet, install the USB driver provided on the
product CD. Once it has been installed and the instrument is connected,
the driver will be used to establish communications using a virtual
COM port on the PC.
Using the USB Port to connect to a PC
Note:
Make sure the
USB driver has been
installed on the PC before
connecting and applying
power to the instrument.
To connect the instrument to a computer using the USB port, make sure
that the driver has been installed first. Connecting the instrument to the
PC and applying power before the driver has been installed will be
problematic. Refer to the following:
1. Remove power from the instrument.