: The master device periodically sends a request to each slave device to retrieve data. The slave device then responds with the requested data.
| Method | Cost | Validity | |--------|------|----------| | | $129–$149 | Lifetime, legal, safe | | Request evaluation extension (rare) | Free | Temporary, contact vendor | | Free open-source alternatives | $0 | Limited features | modbus+poll+key+full
While Modbus Poll Key Full offers several advantages, it also presents some challenges and limitations: : The master device periodically sends a request