Host Engineering Forum

General Category => Do-more CPUs and Do-more Designer Software => Topic started by: PLCwannabe on March 18, 2025, 10:39:21 PM

Title: Opi Grain Temp cables to BRX Plc
Post by: PLCwannabe on March 18, 2025, 10:39:21 PM

  I'm looking at a project where I'll need to read OPI grain bin temperature cables data. The 2-wire cables have sensors embedded every 5 feet with up to 10 sensors per cable and somehow they use the 2 wires for power and communication. (it appears each sensor has an individual address). I wonder if this can even be done with a brx plc. The link below goes to a forum thread that asks just that question. How to insert links in threads?


https://www.thecombineforum.com/threads/reading-opi-cables-with-and-arduino.349749/

Title: Re: Opi Grain Temp cables to BRX Plc
Post by: rlp122 on March 23, 2025, 02:22:08 PM

I had to do something a bit similar to this.  My solution was an Arduino Uno and an RS-232 convertor to get it into the BRX.  Only about a dozen lines of Arduino code needed.

I don't have any of it about, it was under an NDA so I can't share it.