Code for reading and controlling Pentair EasyTouch via RS485/RS232

This utility is meant to be run as a service on a system utilizing a RS485 reader. In my case, it's a Rasberry Pi 3 with a USB RS232/RS485 connector. A single CAT5 line (using only 2 wires) extends from the pool controller to the Rasberry Pi.

This service integrates with a SmartThings driver to allow controlling the Pentair equipment via the SmartThings app. You can activate pool features simply by issuing GET requests to the correct endpoints.

NOTE: since the services are exposed on port 8080, you will need to take care that this port is not exposed to the outside world on your router. Also, there's no authentication mechanism - anyone on your home network could control your pool if they knew how.

The service assumes your COM port is /dev/ttyUSB0 so you will need to modify this depending on your system and OS.

When you run the service, pool controller endpoints will be exposed:

/pool/status Returns all features and their statuses

Example:

$ curl http://192.168.1.13:8080/pool/status
Response: {
  "air_blower": "off",
  "air_temp": 74,
  "aux": "off",
  "cleaner": "on",
  "destination": "Broadcast",
  "last_update": "Sun, 09 Apr 2017 10:24:33 GMT",
  "pool": "on",
  "pool_light": "off",
  "source": "Main",
  "spa": "off",
  "spa_light": "off",
  "spillway": "off",
  "time": "11:00",
  "water_feature": "off",
  "water_temp": 74
}

Set a feature to an on/off state using /pool/-feature-/-state-
Examples:
Turn the spa on
$ curl http://192.168.1.13:8080/pool/spa/on
Response: {
  "spa": "on"
}

Turn the spa off
$ curl http://192.168.1.13:8080/pool/spa/off
Response: {
  "spa": "off"
}

Turn the pool light on
$ curl http://192.168.1.13:8080/pool/pool_light/on
Response: {
  "spa": "on"
}

The list of features can be found above in the /pool/status response.

You can tap into the RS485 BUS on the controller and wire as follows

Controller ==> RS485/RS232 Converter ==> Raspberry Pi

I used CAT5 to run the wires but you only need 2 for RS485.