AutoLink 2 & Distance Measuring
Counters & Classifiers
Pedestrian Detection
About AutoLink

Safely plug-in the AutoLink - II in seconds!  No cutting into vehicle cables required.

Since 2008, the AutoLink has been the product of choice for connecting to your (DMI) Distance Measuring Instrument.

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OBD Technology

Here is a little background on OBD technology. The OBD-II system is the present culmination of the pollution control efforts of the California Air Resources Board (CARB) and the Environmental Protection Agency (EPA). The primary purpose of OBD is to electronically monitor your car's engine and fuel system to make sure that it's running as efficiently as possible. This, in effect, cuts down on harmful auto emissions. If anything monitored by OBD malfunctions, resulting in decreased efficiency, then the Check Engine light, or Malfunction Indicator Light (MIL), on your dashboard is illuminated. 

There are many engine components monitored by OBD, so your MIL could come on for many different reasons (some are merely temporary glitches, while others could render your car immobile). With an OBD scan tool, anyone (not just mechanics) can ascertain why the MIL has been turned on. Several companies have developed scan tools for this purpose. There are self-contained instruments that typically are expensive and others that interface to laptops or PDAs. OBD2LT and OBD2PDA support an OBD scan tool manufactured by Harrison R&D in Texas (shown here). We have found it to be very reliable, rugged, and cost effective.


User Experience

“We have been using DMIs for years and recently it’s been very difficult to connect to our vehicle speed sensor cables. Now with the Auto Link we no longer have the costs or the aggravation of splicing into cables under our trucks. We surveyed 1700 miles during our tests and were very pleased. The Auto Link is a great product.”

“ We’ve had a lot of problems installing our DMIs in new vehicles. Our truck dealership advised us that we would have warranty issues with the new vehicles if we spliced into cables on this new fleet. Also if we were to connect to the ABS braking system the warranty would be voided and there may be a liability issue should we have an accident. The Auto Link solved all these problems.  Now we’re using about 15 Auto Link modules.”

“Every year we hire students for doing road surveys and we have to have 3 or 4 temporary installations done in different vehicles. In the last 4 years we’ve had nothing but installation problems connecting into vehicle speed and power cables. In some cases we’ve had to have them done 2 or 3 times. This is very costly and time consuming. Now we use only the Auto Link modules and these are great for us.”


Sample Test Graphs

Distance Measurements: AutoLink (OBD) vs Standard DMI (MDS)

Speed Measurements: AutoLink (OBD) vs Standard DMI (MDS)

These are two typical graphs we get when we test the AutoLink in a vehicle with a calibrated DMI sensor. A Modular Distance Sensor (MDS) is installed in a vehicle and the sensor is carefully calibrated. An AutoLink is also connected in the same vehicle to another DMI. The outputs of the two DMIs are read by software we wrote running on a laptop. The software stores the distance and speed as measured by each system each second and then plots the data on two graphs. In this test the vehicle followed a fairly typical route that required several stops.

The top graph shows the accumulated distance as recorded by the two systems. It isn’t immediately obvious from this graph but there are two lines plotted. The second graph is similar, but shows the variations in the speed of the vehicle. You can see that the two graphs show that the AutoLink data tracks the MDS data almost perfectly. At this scale you really can’t see any error. (We will have more, comprehensive testing results available at a later date.)

Contact Us:
Phone: 705-789-2900  Toll Free: 1-877-278-8342  Fax: 705-789-8798  E-mail:

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