Everything connects to a single data bus - I'll call it a "comm bus" - and one bad device can foul up communication for everybody elseīefore we dive into the troubleshooting steps, here are a couple of things to note:. Both the A and B data lines are required for any communication to work - it doesn't work with just one. The driver chip is easily damaged if the signal exceeds the maximum input ratings (typically +/- 12 volts on the A/B wires), and a bad driver can break the whole comm bus.įrom all the above RS-485 drivel you should take away the following 3 points. Each device uses a special driver chip to control whether the device is talking or listening and converts the RS-485 signal into something the micro-controller can use. If you looked at the RS-485 signal on an oscilloscope you'd see that the signal varies between approximately +12 and -7 DC volts. Only one device is supposed to "talk" on the bus at any given time but all devices can listen. All devices on the system are connected to a data "bus", which basically means that the "A" wires from all devices are connected together and the "B" wires from all devices are connected together. 
Other characteristics of RS-485 communication include: These data wires are labeled "A" and "B" (or sometimes D+ and D-) and the polarity of each wire relative to the other determines whether the data bit is a 1 or a 0. Unlike serial interfaces that have separate Transmit (TX) and Receive (RX) wires, RS-485 uses two "differential" data wires for sending and receiving data. If you're familiar with the RS-485 standard you can skip the next section, otherwise I'd recommend giving it a quick read to get the gist. The first thing you need to know is that Pentair systems use an RS-485 interface for serial communication between connected devices, operating at 9600 baud (8/N/1). The good news is finding the cause of these problems isn't rocket science and involves no black magic.
an Easytouch wireless remote or indoor panel shows "No Comm". communication timeout errors show on the intellitouch indoor panel. 
an Intelliflo pump won't run the schedule.pressing a button on a remote or indoor controller does nothing.The following problems can be caused by faulty communication: Communication issues are among the most common problems people run into with their Pentair pool equipment.
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