Read contents of a contiguous block of holding registers
Read Input Registers
0x04
Read contiguous input registers
Write Single Coil
0x05
Write a single coil to ON or OFF
Write Single Register
0x06
Write single holding register
Write Multiple Coils
0x0F
Force each coils in the sequence of coils to either ON or OFF
Write Multiple Registers
0x10
Write a block of contiguous registers
Diagnostics and Service
Read Device Identification
0x2B 0x0E
Read identification information relative to the physical and functional description of the device (Vendor Name, Product Name, Model Name, Revision, e.t.c.)