SI-3C
™
U
ser
’s M
anual
7
3. Getting Started
3.1 Introduction
The SI-3C™ is a low profile radar specifically designed to measure
speeds and export that speed information as RS232 data via the
special serial cable . This allows the SI-3C™ to be used for a wide
range of applications such as Radar Speed Trailers, traffic speed
data collection (when used with the Decatur EZ Stat™ data logger)
or other uses where speed monitoring is desired . The SI-3C™ comes
with a Programming disk that allows the user to configure certain
parameters of the SI-3C™ for specific applications . Refer to Chapter 4
for configuration information . Additionally, a Radar Monitor program
is also available that allows you to display speed information on your
computer and record that information to a text file for analysis .
3.2 Connecting the Serial Cable
The SI-3C™ operates off of +12VDC and comes with a cable that
has two connectors . The circular connector plugs into the SI-3C™
and the DB-9 serial connector (shown in Figure 3 .2) is used for
powering and communicating with the SI-3C . When connecting
the cable it is important to understand that unlike standard RS232
serial connectors that have no +12VDC provisions, the SI-3C's™ serial
connector has two pins dedicated to B+ and ground for the purpose
of powering the unit . Figure 3 .2 shows the pin arrangement .
Figure 3.2
Front view SI-3
™
Serial Connector
Top Row
Bottom Row
Pin 1 = +12VDC (power)
Pin 6 = N/C
Pin 2 = RS232 TX
Pin 7 = N/C
Pin 3 = RS232 RX
Pin 8 = Remote On
Pin 4 = N/C
Pin 9 = Ground (power)
Pin 5 = RS232 Ground