4.5 Setting up the CG3 OBDII Interface
As of Software Version 1.18, the CG3 provides a superior option for measuring
distance over the traditional Vehicle Speed Sensor signal, by sampling vehicle speed
directly from the On-Board Diagnostics Port, version 2 (OBDII). The speed data is
then converted to distance. This provides a faster, cleaner installation. The
advantages of using this feature are:
No need to search for a Vehicle Speed Sensor (VSS) wire, which usually
requires accessing one of the Electronic Control Modules (ECM) in the
automobile.
No need to calibrate the taximeter.
Completely eliminates problems with accuracy caused by noise and
weak VSS signals.
Overcomes the problem where an automobile does not have a
dedicated VSS available (an increasing problem with modern vehicles).
Greatly reduces the time and cost of installation. Where traditional
installations can take hours, this feature reduces install to minutes. For
sizeable taxi fleets, this can result in savings for labor and down-time in
the range of tens of thousands of dollars per year.
Reliable fare accuracy over the long run, eliminating the risk of lost
revenue.
To use this option, your CG3 must contain software version 1.18 or higher (we make
software updates freely available on our website). Also, you must have a compatible
OBDII interface device that connects to the CG3 (either via Bluetooth or RS-232
cable) and will plug into the automotive OBDII port. See the following link to our
website for such an adaptor:
http://recordtechnologies.com/collections/taximeters/products/black-cat-adapter
NOTE: We have found with experience that older North American vehicles (pre-
2007) are hit-and-miss when it comes to sampling speed from the OBDII port, and
therefore we can’t guarantee that this method will necessarily work in those vehicles. If
you plan on using an older vehicle, call us first and we’ll do our best in helping you
determine if using the OBDII port for distance measuring will work or not
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