Houston Radar SS300 User Manual
Page 9 of 19
Wire Signal Descriptions:
Note 1:
See Appendix A for detailed description on how to hookup an
external device to be triggered when radar detects incoming objects.
Incorrect hookup may result in the output devices being destroyed and will
not be covered under warranty.
The SS300 features TWO low impedance outputs that can trigger/turn on an
external display/device to bring it out of power saving mode when a vehicle is
detected. Both outputs are under radar software control and the typical
functionality is to turn both on together when a vehicle is detected. However, if
you need different functionality please contact us.
When a vehicle is detected and the speed is above the “LO” speed limit and
below the “HI” speed limit, both these pins are pulled down to GND and held
down to GND as long as a vehicle is detected. These pins are released as soon
as the radar detects no further traffic. This logic may be inverted via a bit in the
IO variable. See later section.
These are “open drain” (AKA open collector) outputs capable of sinking 130 mA
each. You must limit the current externally to ensure that no more than 130 mA
goes into each pin when they turn on. They may be connected in parallel to
double the sink capacity to 260 mA.
The device providing this functionality on the radar board is the ON-Semi
“NUD3160” relay driver. Please refer to the
datasheet
for this device on detailed
operating characteristics for these trigger outputs.
Connector
Pin #
Signal
Name
Direction
(wrt Radar)
Description
1
GND
PWR
Radar GND (battery “–“ terminal)
2
N/C
N/C
Do not connect
3
I/O0
I/O
Reserved for future use
4
I/O1
I/O
Reserved for future use
5
I/O2
I/O
Reserved for future use
6
I/O3
I/O
Reserved for future use
7
Trig O/P 1
Output
“Open Drain Output 1”. See Note 1.
8
Trig O/P 2
Output
“Open Drain Output 2”. See Note 1.
9
RS232 TX
Output
RS232 Transmit Signal from radar
10
RS232 RX
Input
RS232 Receive Signal into radar
11
VCC
PWR
+8.7 to +18VDC Power Supply
12
GND
PWR
Radar GND (battery “-“ terminal)
