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How do I integrate a PID temp controller into a microcontroller system? Answered

I understand that most PID temp controllers have some sort of interface to change the set-point via buttons or similar controls but I want to control my set-point using a microcontroller(picaxe). I'm not looking to build or program PID control into my system I'm really only looking to integrate an existing system. any tips on how I might be able to achieve this?

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iceng

3 years ago

Steve is correct. I never tried to talk to run multiple units on a RS485 line.

P=Proportional, I=Integral, D=Differential is what a PID controller can do in response to a situation there is a 70 pp manual as to how to assign numerical weights to the three modes of control and how to assign level ranges that alter the PID values.

My experience with these controllers like the Micr-Omega is, they work so very well and configure so extremely detailed and difficult.

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steveastrouk

3 years ago

many pid controllers have an optional MODBUS interface, which is transmitted over RS485

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steveastroukdanjamesardoin

Answer 3 years ago

A fairly complex packet protocol, you have a master-slave interface, there is only one master and up to 255 slaves, individually addressed. You also have a message acknowledge protocol, where the message has to be acknowledged in less than a specific time, or the packet is deemed missed.

A PID controller may run something mission-critical, so there are no chances taken with simple ASCII interfaces.