SI-3
™
U
ser
’s M
anual
7
3. Getting Started
3.1 Introduction
The SI-3™ is a radar specifically designed to measure speeds and
export that speed information as RS232 data via the attached
serial cable . This allows the SI-3™ 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-3™ comes
with a Programming disk that allows the user to configure certain
parameters of the SI-3™ 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-3™ operates off of +12VDC and is equipped with a specialized
DB-9 serial connector that contains provisions for powering the unit .
When connecting the cable it is important to understand that unlike
standard RS232 serial connectors that have no +12VDC provisions
the SI-3'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
Pin 1 = +12VDC (power) (red wire)
Pin 2 = RS232 TX (white wire)
Pin 3 = RS232 RX (green wire)
Pin 4, 6 ,7 = N/C
Pin 5 = RS232 Ground (brown wire))
Pin 8 = Remote ON (blue wire)
Pin 9 = Ground (power) (black wire)
