HART, PROFIBUS-PA, FF – three communication protocols
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Regarding the three communication protocols of HART, PROFIBUS-PA, and FF, I have always had some confusion about them. I would appreciate it if friends could share their understanding. Thank you.
HART (Highway Addressable Remote Transducer) is an open communication protocol for addressable remote sensor high-speed channels; it belongs to the Fieldbus Control System family
Could you be more specific? I can easily find this information on Baidu as well. Thank you.
First, it is all digital communication, offering much better precision and data volume compared to analog systems, and it also supports remote diagnosis； Second, the standards of different protocols are different, making it basically impossible to use them together; just like there are charging ports of the type Lightning and Micro USB. done.
Guess: HART is based on 4–20mA analog signals, while FF is based on digital signals: lol
No, Hart is a protocol; the physical layer usually uses Bell 202, which can be superimposed on current signals. Hart is different from Bell202. Moreover, in multi-point Hart communication, the value is usually a constant 4mA.
Different bus protocols. HART is the most widely used, and it is supported by most instrument manufacturers ； Profibus is mainly from Siemens ； The FF bus is mainly from Emerson.
Learned: handshake