User's Manual
9
SYSTEM HARDWARE OVERVIEW
POWER SUPPLY
The radar is powered using a DC voltage in the range of 10 to 16 Volts. This is supplied on the power and test
connector. This connector is a Bulgin PXO412/06P mating type PX0410/06S/4550.
Reverse polarity protection is included in the design. The radar can take a large current during power up that is
of the order of amps which only lasts for ~1ms and as such should not affect most applications.
A thermal fuse with a 750mA rating has been installed to protect against electrical short circuit fault conditions.
Power-Up Sequence
Upon initialisation from power-up or *REBOOT the radar will respond with the following sequence of messages;
AGD SYSTEMS LTD AGD342 RANGING ENFORCEMENT RADAR
Firmware Version MI-146-2-P2
Firmware Compile Time 10:21:21 Dec 5 2012
Co-Processor Firmware MI-147-1,Nov 12 2012
........
HB,00000000*FD
Whilst the radar is carrying out its self-test functions a series of decimal points will appear. When finished the
radarwillreportaHeartbeat(HB)messagetoindicatetheradarhassuccessfullyinitialisedandisnormally
operating. The host system should not send the radar any messages whilst it is initialising. Messages should
be sent to the radar after the HB is received. The radar will always send an initial HB message after initialising
following power-up even when the HB message is turned off.
Power Supply Tolerance
The radar power supply is specified between 10 and 16Vdc. These are the limits applied on test and calibration.
The radar will operate outside this range but its operation is not specified. At 12V dc the current is 250mA.
When V
SUPPLY
<10Vdc(butenoughtopowertheradar)theLEDwillpermanentlyIlluminated.
When V
SUPPLY
>16Vdc(butbelowfuselimit)theLEDwillash.
power / test ConneCtor ConneCtions
Pin No Signal Description
1 REF Reference frequency
RS422 voltage levels
2 REF
3 I
Do not connect.
I and Q port connections for directly
measuring received signal or for
simulated signal injection
4 Q
5 VIN Supply voltage 10 to 16Vdc
6 GND Supply ground