这个是执行写指令需要遵守的要求
Query message
Byte Field name Notes
0 Slave address
1 Function code (16)
2 First register address - high byte 16 bit register address
3 First register address - low byte
4 Number of registers to write - high byte 16 bit number of registers, must be in the range 1 to 123
5 Number of registers to write - low byte
6 Byte count (n) 8 bit even number in the range 2 to 246 (number of registers *2)
7 First register - high byte 16 bit register
8 First register - low byte
…
5+n Last register - high byte 16 bit register
6+n Last register - low byte
7+n/8+n Error check CRC
Normal response