Houston Radar DC310 DC310 Field Sensor Module User Manual 8 User Manualx

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DC310
User Manual and Installation Guide
K-Band Doppler Speed Sensor
Built Type: DC310-DFT, DC310-OFD
Rev 0, 10th April 2013
DC310 in Weatherproof Enclosure
DC310-DFT
Houston Radar LLC
12818 Century Dr. Stafford, TX 77477
Http://www.Houston-Radar.com
Email: sales@Houston-Radar.com
Contact: 1-888-602-3111
DC310 Open Frame Version
DC310-OFD
This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation. The device must be located 20 cm or more from persons. The device must not
be co-located with other transmitters. These warnings must be included in the user
manual of the final configuration where this device is utilized.
Changes or modifications not expressly approved by the party responsible for compliance
could void the user's authority to operate the equipment.
Any modification or use other than specified in this manual will strictly void the
certification to operate the device.
This device carries FCC modular approval and as such is labeled with FCC ID
TIADC310. If this label is not visible when the module is installed inside another device,
then the outside of the device into which the module is installed must also display a label
referring to the enclosed DC310 module. This exterior label can use wording such as the
following: “Contains Transmitter Module FCC ID: TIADC310” or “Contains FCC ID:
TIADC310.” Any similar wording that expresses the same meaning may be used.
Warning: DC310-OFD radar is supplied in an open frame format with exposed antenna
and electronics and thus is a static sensitive device. Please use static precautions when
handling. Warranty does not cover damage caused by inadequate ESD procedures and
practices.
Note: Specifications may change without notice.
Note: Not liable for typographical errors or omissions.
Table Of Contents
INTRODUCTION ......................................................................................................... 5
INSTALLATION .......................................................................................................... 5
MOUNTING................................................................................................................... 5
RECOMMENDED ENCLOSURE FOR THE DC310-OFD: ..................................................... 7
HOOKUP:...................................................................................................................... 8
Power Input:............................................................................................................ 8
Serial Connection: ................................................................................................... 8
Average Speed Output: ............................................................................................ 8
Setting variables from an ASCII Terminal program via ASCII commands: .............. 9
WIRE SIGNAL DESCRIPTIONS: ..................................................................................... 11
USE .............................................................................................................................. 12
Internal Clock: ...................................................................................................... 13
Configuring the Unit: ............................................................................................ 13
Configuring the Radar via the provided Houston Radar Configuration Tool GUI:. 15
STEP 1: Connect to Radar ..................................................................................... 16
STEP 2: Click on Radar Setup to bring up the configuration GUI .......................... 17
STEP 3: Select the radar units ............................................................................... 18
STEP 4: Set the radar cutoff speeds (low and high speed cutoff) ............................ 19
STEP 5: Configure the trigger outputs ................................................................... 20
STEP 6: Enable Average Speed Output.................................................................. 21
STEP 7: Input Voltage and Ambient Temperature .................................................. 22
DC310 SPECIFICATIONS ......................................................................................... 23
GENERAL ................................................................................................................... 23
APPROVALS................................................................................................................ 23
DATA INTERFACES ..................................................................................................... 23
MECHANICAL ............................................................................................................. 23
PERFORMANCE ........................................................................................................... 24
APPENDIX A: HOOKING UP TO THE TRIGGER OUTPUTS ON THE RADAR
...................................................................................................................................... 25
APPENDIX B: OPTIONAL BREAKOUT IO BOARD CONNECTIONS: ............. 26
OPTIONAL BREAKOUT IO BOARD CONNECTIONS: ....................................... 27
INTRODUCTION
Congratulations on your purchase of the Houston Radar directional Tracking Doppler
Radar DC310. This state of the art 24GHz K-band microwave Doppler radar is
specifically designed for the license free battery operated traffic monitoring and data
collection market.
Utilizing high performance, ultra-low power DSP (Digital Signal Processing) technology
and microwave components based on a planar patch array antenna with integrated low
power PHEMT oscillator, you will find that this high quality product meets your exacting
standards for performance and reliability.
Some of the highlights of this product include:

 World’s smallest and lowest power usage OEM target tracking, multi-lane and
dual-direction traffic stats radar at 0.17 Watts1

 Collects individual time stamped vehicle counts and speeds per direction in up to
2+2 lanes simultaneously making it a perfect fit for real-time traffic monitoring
and speed study applications

 Best-in-class 0.4% per vehicle basic speed accuracy

 Calculates average speed in real time for remote access2 or generate detailed
speed studies with 85th percentile speeds from historical data

 Vehicle classification in up to 3 size classes

 Data saved in on-board memory or available real-time via RS232

 FCC pre-approved with CE mark

 “Install and Go” hassle free no configuration required installation

 Wide input operating range and low power allows solar operation

 1.9Wx2.1Hx0.9D in (4.5x4.8x2.4 cm) weatherproof enclosure option

 Firmware “boot loader” allows for field upgrading of firmware

 100% self-test feature built-in including radar’s own power usage

 IO expansion board w/ DB9 connector available for ease of testing

 Fully functional Windows Traffic Statistics Analysis program available to
generate reports and graphs of vehicle counts, averages, & 85th percentile
speeds.
INSTALLATION
Mounting
DC310-OFD is supplied in an “open frame” format. It requires a weatherproof enclosure
before it may be used outdoors. Alternatively it may be mounted as a component in
another product that already has a weatherproof enclosure.
The DC310-OFD should be mounted such that the connector points left or right as shown
in the picture on the front page.
The DC310-DFT is supplied in a weatherproof encapsulated enclosure with a pigtail
connection. This unit may be mounted outside without any further protection from the
environment. The DC310-DFT should be mounted such that the text “Houston Radar” on
the face of the unit is horizontal.
Pick a location where the traffic is free flowing and the DC310 has at least 100 feet
(30m) of unobstructed road in either direction. Avoid mounting within 100 feet (30m) of
congestion points such as stop signs, sharp turns and traffic signals. Avoid mounting
where trees, branches or other objects are obstructing the view of the traffic.
Mount on the side of a two lane undivided road to measure both directions. Mount within
12 feet (3.6m) off to the side of the road. We recommend making the incoming direction
the closer lane.
Mount in the median of a four lane divided road to measure both directions. Pick a
location where the median is no more than 12 (3.6m) feet wide.
Mounting on the side of a 4 lane divided road will allow the DC310 to capture only the
closest two incoming lanes accurately.
Radar may be mounted typically with 0 to 10 feet offset to the side of the road or in
middle of median that is no more than 12 feet wide.
Mount DC310 at least 6 feet (1.8m) high but no more than 10 feet (3m) high. Adjust the
tilt to point down to look at a spot about 75 to 100 feet (20 to 30m) in front of the radar.
You may mount as low as 4 feet (1.2m) if the location has low traffic density and you are
on an undivided two lane road.
When installing on the side of the road point DC310 slightly inwards towards the road.
When installing in the median between opposite flowing traffic, do not angle the DC310
towards either side. You should still tilt the DC310 down to point about 100 (30m) feet in
front of the mounting location.
10 feet max
10 feet max
12 feet max
Radar on side with 1
lane each direction
Radar on side with 2 lanes
incoming. No outgoing lanes
can be detected
Radar on single lane median
with up to 2 lanes on each
side
Recommended Enclosure for the DC310-OFD:
The DC310-OFD radar needs to be enclosed in a weatherproof enclosure for outside use.
The following needs to be observed for optimal performance:
1. The front face of the radar (with the golden pads) is the antenna and is the face
that must point into traffic.
2. Any cover or window in front of the unit MUST be at least ¼” away from the
face.
3. Do NOT spray any conformal (or other) coating, paint or other substance on the
antenna.
4. The optimum material to use as a front window is Lexan (Polycarbonate) plastic.
5. The optimum thickness of the polycarbonate window is half wavelength at
24.125Ghz or about 3.5 to 3.7mm (0.137” to 0.146”) thick.
a. Alternatively a thin window of any plastic material may be used. The
maximum thickness in this case should be no more than 1 mm (40 mils).
b. Standard 0.25” thick Lexan should be avoided as it has particularly high
reflection coefficient due to this specific thickness.
6. Other plastic materials may be used as a front window, but the optimum thickness
will wary with the material’s dielectric constant. Please contact us for details.
Alternatively, you may consider weatherproof version DC310-DFT that is available from
Houston Radar.
Hookup:
Power Input:
The DC310 radar features wide operating input voltage range of 5.5V-18V. In a typical
application it may be powered from a nominal 12V DC source and will feature best in
class operational power consumption of 14 mA (average). There is no other radar in the
world that even comes close to this ultra-low power usage. Competing products may
consume up to 20 times more power.
This ultra-low operational power translates directly into a longer battery life or gives you
an option to power the unit from smaller batteries and smaller solar panels.
Note: The radar employs aggressive power saving measures that include turning off parts
of the circuit that are not being used at any instant. To get a true measure of the power
usage of the circuit use a multi-meter that has an averaging function and does not suffer
from autoranging during measurements. Otherwise you will get current readings that
fluctuate from 7 mA to 23 mA.
Note: when the under-voltage lockout (UVL) feature is activated, the operating voltage
range is reduced to 6.2V-18V and dropping the input voltage to 4.5V-6.2V will put the
radar into a sleep mode where it will only update the internal clock.
Your power supply to the radar must be capable of supplying up to 40mA of current for
up to 5 seconds at a time (startup current is higher as the radar is initializing its internal
systems).
Serial Connection:
The DC310 features an RS232 interface that is used to output average speed, access
statistics data and configure the unit as explained later in this document.
The RS232 interface is factory set to default to “cable detect” mode and will power the
interface chip down to save power if the radar RX line is not connected. Cable detect
mode may be disabled and the interface may be forced ON via a bit in the “MD” variable.
Average Speed Output:
The DC310 can send out the average measured speed via the ASCII interface as a 3 digit
speed with an optional direction indicator. This option is not turned on in the default
configuration, and must be enabled. The format is:
[?,+,-]nnn[.ddd][\r,\n]
The format of the speed output can be adjusted to any combination of:
“?”: Optional prefix sent when 000 is selected to be sent when no vehicles are detected
“+”: Optional prefix sent when nnn speed is sent for incoming vehicles
“-”: Optional prefix sent when nnn speed is sent for outgoing vehicles
“nnn”: Three digit ASCII speed in the units selected via the UN variable
“.ddd”: Programmable number of digits (0-3) after decimal point
“\r”: Carriage Return character, optional line ending
“\n”: Line Feed character, optional line ending
At least one or both of the line endings must be selected with ASCII format. No line
ending is not an option. Please see serial port configuration section for details on how to
select the above format.
Setting variables from an ASCII Terminal program via ASCII commands:
All the radar variables can be set and queried via a simple ASCII command set over the
serial port. ASCII commands may be issued via an ASCII terminal program like
Hyperterminal or Teraterm Pro. Alternatively, you may issue these commands from an
attached microcontroller.
All settings are written to FLASH memory and are non-volatile. Do not update
settings on a periodic basis, e.g. every second or every minute. Only change settings
when the user needs it. The FLASH memory has a limited number of write cycles
and will wear out with excessive (>10,000) number of writes. On the other hand,
setting the variable to the same value repeatedly is OK because the radar recognizes
that the variable has not changed and does not update it in FLASH.
The ASCII commands are:
get (get a config variable)
set (set a config variable to a supplied value)
reset (resets the radar. Required after changing variables MO, MD and RS).
info (print out some info about the radar. Info is in the format of =). New
tags may be added in the future. Order of tags may be moved around.
e.g.
To set a variable (variables are documented in the user manual):
set:  [Enter]
e.g.
set:LO 5
alt format:
set:LO=5
sets the low speed cutoff to 5 etc.
Variables are case sensitive. Commands are not.
Success is indicated by an "OK".
Failure is indicated by either:
"ERROR" - Command was recognized but some other error occurred (variable not
present, format not correct, etc.)
 - Command was not recognized. Entire line was silently discarded.
This ensures that spurious things like enters or other ASCII chars do not generate
"ERROR" when you are not expecting them.
To get a variable:
get:[ENTER]
e.g.
get:LO
returns
LO=5 (if value is presently set to 5).
If sending the ASCII command via an attached microcontroller, the “[ENTER]” key
press should be replaced by the carriage return and/or line feed ASCII character.
Wire Signal Descriptions:
Connector
Pin #
Signal
Name
GND
Direction
Description
PWR
Radar GND (battery “–“ terminal)
N/C
N/C
Do not connect
I/O0
I/O1
I/O
I/O
Reserved for future use
Reserved for future use
I/O2
I/O3
I/O
I/O
Reserved for future use
Reserved for future use
Trig O/P 1
Output
“Open Drain Output 1”. See Note 1.
Trig O/P 2
Output
“Open Drain Output 2”. See Note 1.
RS232 TX
Output
RS232 Transmit Signal from radar
10
RS232 RX
Input
RS232 Receive Signal into radar
11
VCC
PWR
+5.5 to +18VDC Power Supply
12
GND
PWR
Radar GND (battery “-“ terminal)
(wrt Radar)
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 DC310 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 of these outputs can be configured to trigger for incoming
vehicles, outgoing vehicles, or all vehicles. If you need different functionality,
however, please contact us.
When a vehicle is detected, the corresponding pins are pulled down to GND and
held low for the time duration specified in milliseconds by the ”TA” variable. 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
“NUD3124” relay driver. Please refer to the datasheet for this device on detailed
operating characteristics for these trigger outputs.
Houston Radar DC310 User Manual
USE
Turn on the power to the DC310 to make it operational. No other action is required. The
radar will activate the appropriate OUT 1 and OUT 2 open drain outputs, if enabled,
whenever it detects a vehicle that is above the programmed lower speed limit (the “LO”
value) and below the programmed high limit (the “HI” value). The default limits are set
at 3 and 99 at the factory. The units (e.g. kph, mph, fps, mps) are determined by UN
variable.
Connect radar to PC RS232 serial port and use provided Windows configuration software
to program the high speed limit (“HI” variable). The radar de-asserts the trigger outputs
above this limit. If you do not wish an upper detection limit, set this value to 159. This
will ensure that the upper limit is never reached regardless if the units are set to MPH or
KPH.
Set the “LO” variable to set the lower detection speed limit. The outputs will be deasserted for vehicles below this speed limit. The lowest value this may be set is 3 MPH
(5KPH).
Green LED flashes at 1/3 Hz (12.5% duty cycle)
rate when radar is running giving a visual OK
signal. In the DC310-OFD version green LED
may be installed on the back depending on the
requested build option.
Page 12 of 27
Houston Radar DC310 User Manual
Internal Clock:
The radar has a built in clock/calendar function. This allows the radar to date/time
stamp the historical archive records saved by the Advanced In-Radar traffic statistics
collection feature.
The radar does not feature a clock backup battery. Power must remain
connected to the radar for the clock to keep time. An external clock battery
may be connected to keep time while radar goes into low power sleep
mode. See Appendix C for more details.
Configuring the Unit:
The radar’s internal parameters may be configured via the radar’s RS232 port after
connecting to a PC’s RS232 serial COM port and using the Houston Radar configuration
program’s Graphical User Interface (GUI). While this is the most convenient way to
configure the radar, customers may also wish to set the configuration variables directly,
for example when the radar is part of a system and connected to another microcontroller.
The radar configuration variables and their functionality are described below.
Configuration
Variable Name
RS
UN
LO
HI
SF
Description
Sets the RS232 serial port’s baud rate and output format. Do not change
this value unless you understand the implications.
Lower Byte: Sets the internal speed units of the radar. All LO, SP, and
HI speeds are interpreted to be in these units.
0 = MPH 2=FPS (Feet per second)
1 = KPH 3=MPS (Meters per second)
Upper Byte: Sets number of digits after decimal point.
Low speed cutoff. Vehicles are not detected below this speed.
Minimum value is 2. Should be set to be less than HI. Speeds above
this limit can trigger the O/P1 and O/P2 outputs.
High speed cutoff. Vehicles are not detected above this speed.
Maximum value is 159. Should be set higher than LO speed.
Select tracking filter. This should be pre-configured to monitor bidirectional traffic. Please contact us if you wish to modify this.
Page 13 of 27
Houston Radar DC310 User Manual
Radar Configuration Variables Continued:
Configuration
Description
Variable Name
Target detection sensitivity. Valid values are from 10 to 100 and are a
ST
percentage of max magnitude. This value should be left at 100, unless
the radar is over counting due to mounting location.
Radar mode bitmask. Bits are as follows:
MO
Bit 0: SI3 ASCII command compat flag. Contact us for more details.
Bit 1: Enable ASCII console output on RS232 serial port
Bit 2 to 15: Currently reserved in DC310 radar
Radar mode bitmask number 2. Bits are as follows:
MD
Bit 0: Enable low voltage power down. See Appendix C for details.
Bit 1: Enable True Average Speed output
Bit 2: Force enable the RS232 interface when set. Sets to “cable detect”
mode when bit is cleared. Power usage is increased by 0.012Watts if
this interface is force enabled or if RS232 cable is connected.
Bit 3: Reserved in DC310 radar
Bit 4: Save traffic statistics (if enabled in radar) in 3mph/5kph speed
bins rather than original default of 5mph/10kph speed bins
Bit 5: Enable beeper (For armadillo)
Bit 6: Enable cycle skipping mode to save power when no vehicles are
detected
Output Hold Time in milliseconds. Once the output is triggered, it is
HT
held for this amount of seconds from the last trigger source before
going inactive.
Radar IO configuration bitmask. Bits are as follows:
IO
Bit 0: Reserved in DC310 radar
Bit 1: Active high open drain 1 output
Bit 2 to 8: Reserved in DC310 radar
Bit 9: Active high open drain 2 output
Bit 10 to 15: Reserved in DC310 radar
Page 14 of 27
Houston Radar DC310 User Manual
Configuring the Radar via the provided Houston Radar Configuration Tool GUI:
1. Install the provided Houston Radar Advanced Stats Analyzer (or Houston Radar
Configuration) Windows program on a Windows 2000, XP, Vista or Win 7
computer. Both 32 and 64 bit operating systems are supported.
2. Connect the radar RS232 port to the PC’s RS232 serial port. If the PC does not
have a serial port you may buy a USB serial converter dongle (from BestBuy,
Radioshack, or any Internet store).
3. Power up the radar. Ensure the green LED flashes every 3 seconds. Power must
be provided externally unless you have purchased and are using the Houston
Radar powered USB dongle (part #USB-RS-P1) which provides a COM port to
the PC and boosts the USB 5V to 12V for the radar all in a single device.
4. Start the Houston Radar Stats Configuration Tool program
5. Click on Start -> Connect to Radar…
6. Click on “Connect” button.
7. Ensure you see a “Radar found on COM” message. The COM # will depend on
your computer
8. Click on OK. Now you are ready to configure the radar.
To Radar RS232 + 12VDC Power
To Windows PC USB port
Houston Radar USB-RS-P1 USB powered RS232 interface to the radar.
For a quick and easy connection from a Windows computer to the radar, we suggest
purchasing our USB-RS-P1 powered USB dongle (shown above). This device
connects to a USB port on a Windows computer and provides a RS232 connection
and 12VDC power to all Houston Radar devices. You can be up and taking to the
radar within a few minutes of receiving your device.
Page 15 of 27
Houston Radar DC310 User Manual
STEP 1: Connect to Radar
Select your COM port
(or “AutoDetect Port”
option) and then click
on “Connect To Radar”.
Click “OK” on the next two boxes.
The one on the left shows you
information about the radar that you
have connected to which you may
ignore at this time.
Page 16 of 27
Houston Radar DC310 User Manual
STEP 2: Click on Radar Setup to bring up the configuration GUI
Click on “Radar Setup” to bring up the GUI.
You must click on “Write To Radar” button for
your changes to be saved to the radar.
Page 17 of 27
Houston Radar DC310 User Manual
STEP 3: Select the radar units
Radar units apply to the speed output over the RS232 serial port as well the low limit
cutoff and high limit cutoff settings.
Additionally, if traffic statistics gathering is enabled, statistics are saved in integer mph
boundary speed bins for mph and ft/sec units and in km/h integer boundary speed bins for
km/h or m/s units in the radar.
Select radar units. Units may be set to
one of the values shown. Additional
units may be added in the future.
Page 18 of 27
Houston Radar DC310 User Manual
STEP 4: Set the radar cutoff speeds (low and high speed cutoff)
Cutoff speeds affect the measurement range for sending speed out over the serial port and
activation of the hardware trigger outputs.
Cutoff speeds will affect collection of traffic statistics for the DC310. Traffic statistics
will not collected outside of the detection limits.
Set the minimum speed you wish the
radar to pick up and display. This is
also the minimum speed that will
activate the trigger outputs.
You may enter a number, click the
up/dn arrows or move the slider.
Set the maximum speed you wish
the radar to pick up and display.
This is also the maximum speed
that will activate the trigger
outputs.
Page 19 of 27
Houston Radar DC310 User Manual
STEP 5: Configure the trigger outputs
Detection Direction: Select “Incoming” to activate trigger for
approaching targets and “Outgoing” to activate for receding
targets. Both types cannot be selected. You may also enable active
low output here.
Page 20 of 27
Houston Radar DC310 User Manual
STEP 6: Enable Average Speed Output
Select this option to enable ASCII average speed
output for both directions. You may also specify
the averaging time in seconds.
Page 21 of 27
Houston Radar DC310 User Manual
STEP 7: Input Voltage and Ambient Temperature
In this section, you can view the radar’s input
voltage, and ambient temperature. Click “Read
Now” to update these values.
Page 22 of 27
Houston Radar DC310 User Manual
DC310 SPECIFICATIONS
General
Operating Band
Frequency
RF Power Output
Antenna Beam Pattern
Polarization
Supply Voltage
Reverse Battery
Nominal Current Draw
Operating Temp.
Weatherproof
IR Remote Programmable
K-Band
24.125 GHz ±50Mhz (US), 24.200Ghz on request
5mW
20deg x 60deg
Linear
5.5V DC to 18V DC
Protected
14 mA avg. (7mA-23mA depending on traffic) @+12V DC
-22°F to +185°F
(-30°C to +85°C). Electronics designed and tested to –40C.
Yes (DC310-DFT build option). Open frame also available.
No
Approvals
Approvals
FCC Part 15, modular approval (US Version), CE Mark.
Data Interfaces
Serial Communication
Data Rate
Data & Pwr Connector
RS232
Baud Rates from
1200 to 115200 baud
DC310-OFD:Molex “C Grid SL” male shrouded 12 pin RA part
#70553-0011
DC310-DFT:Molex “C Grid SL” female 12 pin (mate to above #)
Mechanical
Weight
Dimensions
Cable Exit
Mounting
approx 33 grams (1.16 oz)
2.1”x1.75”x0.6” (LxWxD) 52 x 46 x 16mm
DC310-OFD: Side via right angle connector
DC310-DFT: Encapsulated cable from back
Four #2-56 standoff’s embedded on module
Specifications continued on next page …
Page 23 of 27
Houston Radar DC310 User Manual
Performance
Speed Measurement Range
1.3mph to 100 mph (2.1km/h to 161 kph).
Resolution
±0.006 mph
Accuracy
±0.5% of reading + 0.1mph
Detection Range
Typically 75+ m (250+ feet) for compact vehicles on open
and level road with radar mounted 1.5 m (5 feet) high and
pointed straight into traffic. 150+ m (500+ feet) for larger
trucks, lorries and vehicles with inherently large radar
cross-section. May vary with installation and road
conditions. Detection range specified is typical for speeds
between 20kph and 88kph (12 to 55 mph). It tapers off
below and above this speed range.
Page 24 of 27
Houston Radar DC310 User Manual
Appendix A: Hooking up to the trigger outputs on the radar
The DC310 radar features two “open drain” outputs. The device used for this purpose is the On
Semiconductor relay driver NUD3124. The output configuration of this device is shown below
(from the On Semi datasheet).
The two outputs O/P1 and O/P2 are brought out on the radar connector pins (see IO connector pin
out in manual for connector pin numbers).
This device can sink 130mA of DC current at up to 28VDC.
However, these are low impedance outputs, which means that you must externally limit the
maximum current that will flow into these outputs to 150mA at the worst-case head voltage. They
may be parallel together to increase this value to 300mA.
There are two ways to ensure this:
1. Connect an output device that is rated to draw no more than 150mA at your supply
voltage (+Vhead). This device can be powered up to 28VDC. For example, this can be a
12 or 24VDC relay coil rated at more than 150 mA coil current or
2. Connect an external resistor in series with the output load and the O/P1 or O/P2 pins. The
value of this external resistor should be calculated as follows (ohms law):
R (in K Ohms)= (Vhead –Vload drop)/150
+Vhead
Load
Method 1
+Vhead
Load rated to draw
max of 150mA at
+Vhead max
Load
Resistor
Page 25 of 27
Load
Method 2
Houston Radar DC310 User Manual
Appendix B: Optional Breakout IO Board Connections:
(Non-Isolated Mosfet version with PWM Brightness Control)
Connecting the load to the High power and trigger outputs:
You may directly connect your high power DC load + & - to J5. The load is activated via fuse F1
when the output is triggered.
You may directly connect a <150mA relay coil or other low power load to the J4 & J6 connectors.
The + load terminals are always wired to VCC. The (-) terminals are connected to GND when a
vehicle is detected and the output triggered. J5 is always triggered at the same time as J6.
Page 26 of 27
Houston Radar DC310 User Manual
Optional Breakout IO Board Connections:
(Isolated Solid-State Relay version, AC or DC capable)
Optional Isolated IO Board. Note: PWM Brightness Control is NOT available with
Isolated AC/DC Relay outputs.
Page 27 of 27

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Producer                        : GPL Ghostscript 8.64
Create Date                     : 2013:08:27 14:33:15-05:00
Modify Date                     : 2013:08:27 14:33:15-05:00
Title                           : Microsoft Word - 8-User-Manual.docx
Creator                         : PScript5.dll Version 5.2
Author                          : sharonov

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