Pin Out of the RTD Board
In the bottom image you can find the pin out of the board. The connectors next to the notch are the analog outputs. RTDV is the analog RTD voltage from 0 to 5V for 0V = 15C, 5V = 45C. So multiply the voltage by 6 and sum by 15. Temperature (C) = Voltage*6+15
The VTHR is the threshold voltages, so it allows you to monitor the threshold voltages. These analog outputs are referenced to the board's ground and buffered with an op amp, so they are low impedance outputs.
The central outputs are the Critical Failure (CF) of each channel (labelled from A to L). The CF1C connector has the CF from CH A to F. The CF2C connector has the CF from CH G to CH L. The grounds of these digital outputs are different from the analog grounds! So DO NOT CONNECT them together or you will void the isolation and make it useless. Connectors CF2B and CF2A contain indicators of good connection (i.e. 5V = RTD connected, 0V = RTD disconnected). Connectors CF1A and CF1B are not used anymore.
The VCC connector is the barrel jack and it should receive Vcc from 14V to 17V (you might be able to go up to 40V but I do not recommended it since the efficiency might drop quite a lot, and I haven't tested it. Also this will only work without the internal 5V regulation which I have disabled in these first prototype boards since the power supply for 5V is not working as expected and producing a lot of ripple, as a workaround I have soldered an external 5V power supply on the POW5 connector. The yellow wire is the ground, and the green wire is the 5V).
