Modbus register address converter
Convert Modbus request addresses, numbers starting from 1, and five- or six-digit reference addresses.
How to use
Check the numbering rules in the device manual first. Reference addresses are common manual notation, not a universal device format; they do not indicate whether a device supports that address.
Request addresses range from 0 to 65,535. For example, holding register 40001 maps to request address 0; 400001 also maps to request address 0.
40001 → 0 (0x0000) · 400001 → 0 (0x0000)
Read the register address and offset guide