GE DS200PCCAG9ACB电源连接电路板
从机对功能码03/04的响应是从机地址、功能码、后续数据字节数、数据和CRC。每个数据项以2字节数字的形式发送，先发送高位字节。消息格式和示例：请求从机17以地址006B开始的3个寄存器响应。在本例中，这些地址中的寄存器数据为：05-执行操作Modbus实施：强制单线圈PQM实施：执行操作此功能代码允许主机请求PQM执行特定命令操作。存储器映射的命令区域中列出的命令编号对应于功能代码05的操作代码。操作命令也可以通过使用功能代码16写入存储器映射的命令区域来启动。有关完整详细信息，请参阅功能16-执行命令部分。
The slave response to function codes 03/04 is the slave address, function code, number of data bytes to follow, the data, and the CRC. Each data item is sent as a 2 byte number with the high order byte first. MESSAGE FORMAT AND EXAMPLE: Request slave 17 to respond with 3 registers starting at address 006B. For this example the register data in these addresses is:05 - Execute Operation Modbus Implementation: Force Single Coil PQM Implementation: Execute Operation This function code allows the master to request a PQM to perform specific command operations. The command numbers listed in the Commands area of the memory map correspond to operation codes for function code 05. The operation commands can also be initiated by writing to the Commands area of the memory map using function code 16. Refer to FUNCTION 16 - PERFORMING COMMANDS section for complete details.
