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tagyoureit / nodejs-poolController

An application to control pool equipment from various manufacturers.
GNU Affero General Public License v3.0
327 stars 97 forks source link

How to use RS485 adator with Pentair "3 wire" system? #198

Closed flashvenom closed 4 years ago

flashvenom commented 4 years ago

I'm finally at the last leg of my project - hooking up my Pentair heater to my raspberry pi using a serial connection. I'm just not sure WHERE to hook up the wires using the USB RS485 serial connection so that I can utilize this library... I'm controlling everything else (pumps/lights/actuators) with my own code. But I can't for the life of me figure this part of it out. My pentair heater is a three wire system (model 472592) but my RS485 serial USB adapter is two wires. And then I don't see how this connection could even set the temps. Or maybe I'm just totally not understanding how this works. This part of the project I haven't been able to find many resources. Any feedback would be appreciated! The manual: https://imgur.com/a/327lOFp The serial connector: https://imgur.com/a/MeiVRXW

tagyoureit commented 4 years ago

The heater is controlled via a fireman's switch. It isn't RS485. If the circuit completes the "pool" setting it will run the heater at the pool temp; likewise for spa. No way to control it programmatically. The best you can do is add in a 24v 0.5a relay that you trigger via code.