本文解析了Modbus协议中用于写单个寄存器的指令（功能码0x06）。详细介绍了该指令的工作原理，包括如何指定远程设备中待写入寄存器的地址，并解释了正常响应机制。
06 (0x06) Write Single Register
This function code is used to write a single holding register in a remote device.The Request PDU specifies the address of the register to be written. Registers are addressed starting
at zero. Therefore register numbered 1 is addressed as 0. The normal response is an echo of the request, returned after the register contents have been written.
Tx:01 06 00 01 00 03
Rx:01 06 00 01 00 03
Tx分析
01 从机地址
06 功能码
00 01 起始地址
00 03 寄存器数值
Rx分析
01 从机地址
06 功能码
00 01 起始地址
00 03 寄存器数值
0x01 = 1
[1] 3
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