Hello,
I can't seem to get rid of that flashing input light. I have a two wire analog sensor connected to input 1 on the rev pi. I have connected positive to 26 and 28, and negative to 24. The input is configured for 4-20ma. When I test this input using an onboard revpi output, it works fine, but won't work with my external sensor. Help is much appreciated.
Using the Analog inputs
Re: Using the Analog inputs
Been there... Done the same mistake....
You mostly assume (like I did) that the RevPi AIO supplies the sensor with the necessary +24V BIAS voltage which is not the case. It really only measures current. So you have to connect the plus wire of your sensor to the +24V supply, and the negative wire to the current (+) input on the RevPi AIO and the PSU GND to the (-) input of the AIO.
The documentation is a bit vague in that perspective....
Markus
You mostly assume (like I did) that the RevPi AIO supplies the sensor with the necessary +24V BIAS voltage which is not the case. It really only measures current. So you have to connect the plus wire of your sensor to the +24V supply, and the negative wire to the current (+) input on the RevPi AIO and the PSU GND to the (-) input of the AIO.
The documentation is a bit vague in that perspective....
Markus
Re: Using the Analog inputs
In regards to this where would the + and minus of the transducer be?
Kind Regards
James
Kind Regards
James
RR4711 wrote: ↑11 Dec 2019, 13:45 Been there... Done the same mistake....
You mostly assume (like I did) that the RevPi AIO supplies the sensor with the necessary +24V BIAS voltage which is not the case. It really only measures current. So you have to connect the plus wire of your sensor to the +24V supply, and the negative wire to the current (+) input on the RevPi AIO and the PSU GND to the (-) input of the AIO.
The documentation is a bit vague in that perspective....
Markus
Re: Using the Analog inputs
Read my answer again. It‘s written there...
