仪表通讯协议.pdf

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1、目录1.引言..........................................................................................................11.1仪表通讯及命令............................................................................11.2仪表基本构成与通讯命令的关系................................................22.接线.....

2、.....................................................................................................32.1RS232接口的仪表与计算机的接线............................................32.2RS485接口的仪表与计算机的接线............................................42.3关于JR485转换器..............................

3、..........................................43.通讯接口要素..........................................................................................54.仪表的版本号..........................................................................................65.校验核.............................

4、.........................................................................76.一般仪表命令集详解..............................................................................86.0关于命令集......................................................................................86.1读版本号命令.......

5、.........................................................................106.2读主测量值命令............................................................................106.3读其它测量值命令........................................................................116.4读模拟量输出值及开关量输入输出状态命令.....

6、.......................126.5输出模拟量命令.............................................................................136.6输出开关量命令.............................................................................14目录·i·6.7读仪表参数符号命令.......................................................

7、.............156.8读仪表参数命令............................................................................166.9设置仪表参数命令........................................................................167.巡检仪通讯命令集.............................................................................

8、...187.0关于命令集..............................................................