Michael Lusby Posted April 23, 2008 Report Share Posted April 23, 2008 Hi there, I have connected the vehicle speed sensor input into digital input #1. The input is configured with a pull-up resistor and the sensor is nothing more than a magnetic reed switch driving the line low as a tooth passes. Digital input #1 is unable to read the frequency or speed of this input however when configured as a general input the level of the signal is able to recognised as on/off. Interestingly configuring digital input #3 to be a speed input with the same settings as digital input #1 and connecting the vehicle speed sensor to digital input #3 results in the ecu recognising the frequency of the square wave. Reading through the manual says that digital input #1 is fine for a frequency/speed input, whats going on? is this is a firmware/software bug or is my LinkPlus G3 faulty? Surely if the ecu is able to quantise the signal to low and high conditions for a GP input it simply extends this behaviour to measure frequency/speed by counting the number of edge transitions (edge depending on which triggering option chosen falling or rising) in a given period of time. Link in question is LinkPlus G3 Firmware Rev 1.7.1 and PCLink 3.34 Whats the deal? Quote Link to comment Share on other sites More sharing options...
Simon Posted April 24, 2008 Report Share Posted April 24, 2008 Hi Michael Ill have to get this one on to the bench and do some testing. Are you able to send through your PCL file to [email protected] Simon Quote Link to comment Share on other sites More sharing options...
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