说明：  主要介绍了HART通用命令，HART一般命令，并用一个例程介绍HART上行命令，HART 下行命令，以及BURST命令的使用规则。
(Mainly introduces the the HART general-purpose command, HART general command, and with a routines to introduced the HART uplink command, the the HART downlink command, as well as the the the use of of the BURST command rules.)