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Old 12-17-2013, 07:08 AM   #1
kenh
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Default PID with a serial port

Just curious, is anyone using a PID with a serial port?

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Old 12-17-2013, 08:08 AM   #2
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nope, my pid's work with just wire in and outputs, do you have one with a serial port? got a model I can look up, it sounds advanced

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Old 12-17-2013, 03:55 PM   #3
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I'd be curious what you're trying to do with the serial connection. The PID itself is designed to be a self-contained computer that is good at one specific task. I believe the only 'output' you'll find on most common pids is the Alarm1 and Alarm2 output for temperature.

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Old 12-17-2013, 08:24 PM   #4
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I've heard of models that allow RS485 communication. You pay considerably more for them. I think they are mainly useful for data logging.

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Old 12-19-2013, 12:03 AM   #5
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Quote:
Originally Posted by alien View Post
I've heard of models that allow RS485 communication. You pay considerably more for them. I think they are mainly useful for data logging.
You can do a lot more with RS485 or RS232 than just data logging, you can take over full control of a PID that's Modbus capable.
http://en.wikipedia.org/wiki/Modbus

I've played with the idea of automation and I've seen a lot of projects on this site and other places on the web. But I have not seen anyone include PID temperature control in their project which makes me thing they are just managing temperature like a thermostat. With one of these controllers you could have the best of all worlds - you could automate your process while handing off temperature control to whichever PID you were talking to. The PID would do what it does best - manage the temperature of your mash or whatever.
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Old 12-19-2013, 07:03 AM   #6
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I am, if an Arduino with a PID-library is counted? Actually I've two PID's in a cascade. The serial is used to control and monitor temperatures + if needed changing the PID parameters.

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Old 12-21-2013, 03:09 PM   #7
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Quote:
Originally Posted by kenh View Post
You can do a lot more with RS485 or RS232 than just data logging, you can take over full control of a PID that's Modbus capable.
http://en.wikipedia.org/wiki/Modbus
That's why I said "mainly"

If you care to poke around on my blog (links below) you might find that I have done development work on an open source PID controller with a serial interface that would allow you to program a temperature profile for step mashing or fermentation control.

There are lots of people on this forum using PID in creative ways for brewing, if you look around.
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Old 12-21-2013, 05:33 PM   #8
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Check out the SOLO PIDs from automation direct. I have one and find that configuring it over the Serial port with their software is much easier to enter ramp and soak profiles than using the front panel interface.

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