Tools

Small tools for serial protocols

Checksums are the first thing to verify when a device and a master disagree. These calculators do it in the browser — no installation, no account.

• Modbus CRC16Compute and verify the CRC16 of a Modbus RTU frame
• NMEA checksumCompute and verify the checksum of NMEA 0183 sentences

Runs entirely in your browser — nothing you enter is sent anywhere.