GPS STONERIDGE

GPS Speed Pulse Module

Specification and Installation

Description

This product uses GPS technology to generate a road speed pulsed output. The output pulses at a frequency proportional to road speed. The interface is easy to install and utilises a built-in antenna. It is suitable for 12v and 24v vehicle electrical systems.

Operation

The unit requires a +12/24v permanent (battery) supply in order to maintain open sky hot start capability. When the ignition is switched off, the unit enters a low-current mode but maintains the GPS data required for a ‘Fix’ for a period of up to 3 hours.

An on-board bi-colour LED (surface mounted on the PCB immediately to the right of the connector) will flash Orange 3 times when the unit is first powered from the permanent supply.

The LED will indicate the state of the interface as follows:

Red LED on No Fix

Green LED on solidly Fix

Green LED flashing Fix and road speed signal greater than zero

Wiring

Red + 12/24v Permanent Supply

Black 0v Vehicle Earth

Purple +12/24v Ignition

Green Speed Pulse Output

Installation

The unit should be installed with a clear view of the sky without any metal obstruction. A label on the enclosure indicates the correct orientation of the unit. If these criteria are not met, acquisition time will be greater and performance reduced. A suitable installation would be mounted directly underneath the dashboard, with no obstruction, as close to the windscreen as possible.

Speed Pulse Output

The digital output pulses between 0v and +12/24v at a frequency of 1 Hz / MPH. Different calibrations are available on request.

Specification

Supply Voltage    9.0v to 32.0v d.c.

Supply Current    Operating 35 mA typical

                             Standby 5 mA maximum

Speed Pulse        Output 1 Hz / MPH (3600 pulses/mile, 2237 pulses/km)

                              Output Current = 100 mA maximum

Acquisition           Cold Start 28 seconds typical

                           Hot Start 2 seconds typical

Operating Temperature -40 to + 85 deg C

Dimensions (including mounting lug) 65 mm x 44 mm x 16 mm