Digital Inputs

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(KPro III & KPro4 only)



The digital input pin is connected directly to the microprocessor on the KPro-III. The KPro may be damaged if battery voltage is supplied to this input.


The KPro III has a digital serial input located on the KPro board. This may to datalog and record channels from a digital stream.


This input operates using a 0V-5V level serial protocol with variable baud rate and normal polarity (idle high).


Supported Devices

PLX using iMFD serial data (KPro3: uses normal polarity pin 'I+' KPro4: uses normal polarity pin 'In+').
Innovate LC-1 (KPro3: polarity conversion needed KPro4: uses inverse polarity pin 'In-').
AEM 30-2310 (KPro3: polarity conversion needed KPro4: uses inverse polarity pin 'In-').


Note that none of these protocols include checksum or error correction, so occasionally spurious values can be datalogged.


See Digital Input / Output Wiring for connector details.


Digital Input


This selects the digital input type.


Digital Channels


Most digital inputs have a signal channel, however the PLX has multiple channels using a daisy chain arrangement.  Up to 8 channels may be datalogged.




For each channel the channel type (typically wideband for single channel inputs) and unit may be selected.  With the PLX since it is possible to have multiple channels of the same type (eg 4 channels of lambda, or 4 channels of EGT) an instance number can be set.  The instance number is set by the PLX device based on the order in the daisy chain.  eg the first unit is 0, the second is 1 etc.  Note that this only occurs when multiple channels of the same type are present in the chain - normally the instance will be zero.