Revision 14
40 August 02, 2019
3.4.4 Connect the PC to the analyzer via RS-232
By default, the system is configured at the factory for communication via
the USB mode. If the USB mode of communication is desired, skip the rest
of this section and proceed to Section 3.4.4.
If the PC is not configured with a USB port, connect the USB end of the USB-Serial cable to
the USB port on the front of the analyzer and connect the serial end of this cable to the male
9-pin serial port on the PC.
If you choose to use RS-232 communication, it will be necessary to change the position of a
pair of dipswitches located on bottom left hand corner on the back of the display board
(Figure 3-7). It is necessary to open the ProTech903 electronics enclosure to access this
dipswitch.
Figure 3-7: Display Board
If both switches are in the Up position (marked on the display board as USB), the analyzer
will communicate via USB. If both switches are in the Down position (marked on the
electronics board as RS-232, the analyzer will communicate via RJ9/22 port.
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