Hi Guys, I’m a bit stuck on a problem, I want to use a photon to monitor the conditions of an electric gate control board. Note there are two different types of contact I want to monitor safety I.e photo calls (N/C contact) and triggers I.e open commands (N/O contacts).
The gate control board uses 24-30vdc across these contacts and is looking for the voltage to be pulled down, so if the contact is closed the voltage is pulled down if it’s open then is high.
My problem is as soon as I try and wire any type of circuit into these terminal it has an affect.
Any ideas how I can get a photon to just site snooping on the state of the contacts without affecting them. The control board in question is a BFT Thalia L.
Thanks in advance for any and all help and guidance.