In my original post I thought I had this turkey nailed, sadly not :(
Denkovi tell me... 4 Digital I/O Port: Inputs - 0-5VDC TTL levels, with pull-up 200kOhm resistor. Each can be configured as digital output (0-5VDC).
My sensor has either Normally open 4.5VDC to switched 12VDC Normally closed 12.5VDC to open 4.5VDC
Does anyone know a way I can active one of the inputs directly without using a relay?
Think Im going to need a relay :(
EDIT When the sensor is powered up using 12.8VDC (sensor will operate in the range 12 to 30 VDC) In the NOT switched state, measuring between white (NC) and Blue (0VDC) we measure 12.7VDC. (assumed transistor loss) In the switched state white to blue measure 4.6VDC
As mentioned below 5VDC has to be the maximum the denkovi board is subjected to.