ModBus Playground

Control Modbus-RTU serial devices with Python minimalmodbus library

Prerequisites

Hardware

• Generic USB to RS485 adaptor
• Waveshare Industrial Modbus RTU 8-ch Relay Module Link
• DFRobot URM14 - Industrial Ultrasonic Distance Sensor Link
• Eletechsup AMPTI04 - 4CH RS485 PT100 Temperature Collector
• Eletechsup PTA8E16 - 16CH RS485 PT100 Temperature Collector

Software

• Python>=3.9 - via Anaconda Link
• MinimalModbus Link

Note: For Windows user, check your COM port settings under Device Manager. For Linux user, check your COM port settings under /dev/

08 May 2023 Updates

• pta8e16_16ch_pt100_read_loop.py -- For reading the temperature registers (100 times) from Eletechsup PTA8E16 - 16CH RS485 PT100 Temperature Collector.

29 Apr 2023 Updates

• ampti04_4ch_pt100_read_loop.py -- For reading the temperature registers (100 times) from Eletechsup AMPTI04 - 4CH RS485 PT100 Temperature Collector.

02 Oct 2022 Updates

• rtu_relay_read_info.py -- For reading registers' values from Waveshare Industrial Modbus RTU 8-ch Relay Module.

• rtu_relay_control_demo.py -- For controlling the relays on the Waveshare Industrial Modbus RTU 8-ch Relay Module.

• urm14_read_info.py -- For reading registers' values from URM14 - Industrial Ultrasonic Distance Sensor.

• urm14_dist_read_loop.py -- For reading the distance register (100 times) from DFRobot URM14 - Industrial Ultrasonic Distance Sensor.

Further Readings

• URM14 Wiki Link
• Modbus RTU Relay Wiki Link
• Modbus - Protocol Specification and Serial Line Protocol and Implementation Guide Link