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How to Test Sensors Based on modbus Protocol and RS485 Interface
1, prepare hardware test conditions, 485 to 232, 232 to USB, access PC, PC opens serial assistant, sets baud rate, and selects serial number.

2. According to the manual provided by the sensor, list the test protocol codes.

3. Turn on the system power.

4. Start sending protocol codes one by one through the serial assistant, wait for the sensor to return the results, and compare them with the theoretical results.

In addition, this method can be used in the usual test of 485 equipment, and it can be debugged with serial tools.