Modbus
Modbus Register Viewer Modbus
Input
Bit 15 = MSB (top-left) · Bit 0 = LSB (bottom-right) · click to toggle
Output
Decimal
—
Hex
—
Binary
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Modbus Function Codes
| FC | Hex | Function |
|---|---|---|
| 01 | 0x01 | Read Coils |
| 02 | 0x02 | Read Discrete Inputs |
| 03 | 0x03 | Read Holding Registers |
| 04 | 0x04 | Read Input Registers |
| 05 | 0x05 | Write Single Coil |
| 06 | 0x06 | Write Single Register |
| 15 | 0x0F | Write Multiple Coils |
| 16 | 0x10 | Write Multiple Registers |
Coils and discrete inputs are 1-bit; holding and input registers are 16-bit — this tool views one of those. Discrete inputs and input registers are read-only; coils and holding registers are read/write.