Complete HART protocol commands (1)

We have already introduced the content of the physical layer and data link layer of the HART protocol, and the message structure of the HART protocol is also described. Next, we will make a comprehensive summary of the command operations of the HART protocol. First, we need to know that the command of the HART protocol is processed at the application layer.

Application Layer

Operating commands of the HART protocol are at the application layer, including common commands, Common commands, and special commands.

HART Common commands

General commands are provided on all site devices, including:

1) read manufacturer code and device type

2) read the PV and unit of the variable once.

3) read current output and percentage range

4) read up to four predefined dynamic variables

5) read or write 8 character tags 16 character descriptor date

6) read or write 32 characters

7) read transmitter range unit damping Time Constant

8) read sensor numbers and limits

9) number of final read or write Installations

10) Write logon address