LRC Online Checker

Online LRC checker with hex, ASCII and decimal input modes, providing real-time checksum calculation and verification for Modbus ASCII debugging and serial communication troubleshooting.

Input Data

Input Format

Output Format

Data Input

Include the LRC byte in output

Sample Data

Calculation Results

LRC Value

-

Hex

-

Decimal

-

Binary

-

Byte Count

0

Byte Sequence (with LRC)

Byte sequence will appear after input

Full Data (copyable)

Documentation

This tool calculates and verifies LRC (Longitudinal Redundancy Check) values with multiple input/output formats.

Key Features

Input formats: Hex, ASCII, Decimal
Output formats: Hex, Decimal, Binary
Optional full-frame output including LRC
Built-in verification for existing payloads

Steps

Select input format and enter data.
Choose output format and inspect result.
Copy individual fields or full output.
Run verify to validate frame LRC.

Use Cases

Modbus ASCII debugging
Serial communication checksum validation
Industrial protocol integration testing

Notes

Byte order directly affects computed LRC.
Confirm whether input already includes LRC byte.
Some protocols apply additional framing rules.