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DL2 / ExternalSensors

Connecting external sensors to the DL2

Connecting GPS

For the DL2, the GPS antenna comes with 5 metre cable, which will allow you to position the module almost anywhere on a road car. The GPS antenna connects via a co-axial screw connector on the back of the DL2 Unit. Once the GPS antenna has been connected, it will turn on automatically when there is power to the DL2 unit.

The best place to position the GPS antenna will change depending on the vehicle type. The GPS needs a good clear view of the sky to be able to lock onto the satellites to give the best results. As such, if there is a roof to the vehicle, this will always be the best place to place the antenna. If you are on a vehicle like a kart or a bike, then you will have to find the best location which gives a constant view of the sky.

For more detailed information on GPS antenna positioning, click here. Please note that if your GPS antenna gets damaged, you can buy a replacement antenna from Race Technology. Email for further details if you need a replacement antenna.

"WARNING": To avoid any possible damage to the car paintwork, please take care when mounting magnetic GPS antennas. In particular make sure that there are no dust or grit under the antenna. In some cases it maybe required to add additional protection to the paintwork prior to mounting the antenna to avoid damage.

External Sensors

The DL2 allows you to attach several external sensors for logging. These can be frequency or analogue inputs. There are 4 frequency inputs, generally used for shaft or wheel speeds, and 16 analogue channels, all of which are 12v channels. If the sensor needs a 5v reference supply, one of the pins on either of the analogue connector side supplies this. You can have more than one sensor attached to the ground and reference output.

If you wish to connect an RPM sensor, see here for more details. For more information on the DL2 connectors, click here.

The 12v are nominal maximums which the channels are calibrated for, the absolute maximum is about 50% higher. Exceeding this upper voltage limit will cause other channels to read incorrect voltages. For example if the sensor attached to input 1 (a 5v channel) outputs more than about 7v then the other channels will start to read incorrect voltages - so the sensors should be selected to avoid this situation arising.

Connecting A wheel speed sensor

Allow a few hours to mount and test the wheel speed sensor correctly, there is no simple/universal solution to fitting the wheel speed pickup and in some applications it can be problematic. The wheel speed sensor supplied by Race Technology is a high quality "Hall Effect" type, it is the same type of sensor that is used in high quality ABS and traction control systems on high performance production cars. This type of sensor does not require a magnet to trigger it, just something metal - typically, the sensor is mounted so it is pointing at a moving bolt head. The sensor should be rigidly mounted using the bolt hole though the sensor and with the end less than 3mm from the moving metal object. The closer to the metal object the sensor is mounted, the better the slow speed performance of the sensor. There are 3 wires connected to the wheel speed sensor, click here for more information.

  • The black wire that should be connected to the ground terminal of the DL2
  • The red wire that should be connected to the +5v output of the DL2
  • The white wire that should be connected to the wheel speed input (one of the frequency inputs) of the DL2

Connect A Magnetic Lap Strip sensor

The magnetic lap strip pickup is used in kart installations where there is typically an embedded magnetic strip in the track to indicate the start/end of the lap. The metal sensor should be mounted with the flat metal section pointing down towards the track using the bolt provided. There are 3 wires coming from the sensor:

  • The black wire that should be connected to the ground terminal of the DL2
  • The red wire that should be connected to the +5v output of the DL2
  • The white wire that should be connected to the "Lap Beacon" input of the DL2

Remote start/logging indicator

The DL2 has the option to have a remote start/stop input. On the connectors for the unit, one is labelled Start Logging. If you connect a switch to this, each time you trigger it, it will toggle the logging. There is also an output called Log Status. This output can switch on a small LED, bulb or relay up to a absolute maximum of 50mA. This means that not only can you start and stop the logging remotely, you can also monitor whether the device is currently logging - useful when the DL2 unit is mounted in a position that cannot be seen from the drivers seat.

Please read the following notes regarding all external inputs

If you have any queries on how to connect a specific sensor to the unit, email

Page last modified on July 30, 2009, at 02:44 PM