Lab

Modbus RTU

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Modbus RTU packet builder

Slave Function Data (CRC auto-appended)

Hex preview

Two-way sync: edit fields or hex. CRC-16 appended automatically.

Modbus RTU fields

Hover a field for description.

Checksum sandbox

Modbus RTU

Hex input

Bytes

6

CRC-16/Modbus

C5 CD

0xCDC5 · Low byte first (Modbus RTU wire order).