# USB to RS485 Module with MODBUS-RTU RS485 Soil Sensor on Raspberry Pi 4B **URL:** \ **Category:** Raspberry Pi\ **Created:** [6 October 2024 12:55 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979 "2024-10-06T12:55:07Z")\ **Posts on this page:** 15\ **Page:** 1
**Author:** ![Devansh256408](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@Devansh256408](https://forum.core-electronics.com.au/u/Devansh256408)\ **Post date:** [6 October 2024 12:55 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/1 "2024-10-06T12:55:07Z")
If I purchase 2 of the USB to RS485 Module from DFRobot ([USB to RS485 Module / Adapter / Converter - DFRobot](https://www.dfrobot.com/product-2189.html)) and 2 types of soil sensors which require that USB converter ([Industrial RS485 Soil nitrogen, phosphorus and potassium detect sensor for Scientific Experiment](https://www.dfrobot.com/product-2819.html)) + ([IP68 Waterproof RS485 Soil Temperature, Moisture and pH Meter for Vegetable Cultivation](https://www.dfrobot.com/product-2818.html)), then can I use both on the Raspberry Pi 4B as it has 4 USB ports? And how do I set up the sensors with this USB converter for the Raspberry Pi 4B? ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [7 October 2024 05:11 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/2 "2024-10-07T05:11:36Z")
The USB shows up as a serial port. Suggest you use the [Minimal Modbus Python Library](https://pypi.org/project/minimalmodbus/) on the Pi 4B to interface with the serial port. I have a similar [Waveshare module](https://core-electronics.com.au/industrial-usb-to-rs485-converter.html) and it works well with RS485 sensors (Anemometer & Wind direction). In the end I changed to a [RS485 Expansion HAT for Raspberry Pi - 2-Channel Isolated](https://core-electronics.com.au/rs485-expansion-hat-for-raspberry-pi-2-channel-isolated.html) board because I wanted to two separate RS485 communication paths. The board also provided isolation and shows up as two serial ports on the Pi. My setup was on a Pi 3B+, which is running as a base unit for a weather station of the roof of my house. As you have two sensors you can set this up on the same RS485 circuit. You don’t need two of the modules. RS485 can multidrop a number of devices, just like I2C, each has its own unique address. Minimal Modbus documentation. [https://minimalmodbus.readthedocs.io/en/stable/](https://minimalmodbus.readthedocs.io/en/stable/) Getting all this to work can be a bit frustrating to begin with. Happy to help where I can. Regards Jim ---
**Author:** ![Devansh256408](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@Devansh256408](https://forum.core-electronics.com.au/u/Devansh256408)\ **Post date:** [7 October 2024 05:28 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/3 "2024-10-07T05:28:30Z")
Is there a tutorial or step-by-step walkthrough of how I could set up my 2 soil sensors using this one RS485 expansion board, as I’m a beginner and don’t have much technical knowledge with this, even a schematic of how I could set it up would be much appreciated. ---
**Author:** ![Devansh256408](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@Devansh256408](https://forum.core-electronics.com.au/u/Devansh256408)\ **Post date:** [7 October 2024 05:58 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/4 "2024-10-07T05:58:25Z")
Would this be better for controlling two RS485 sensors ([Dual-channel Raspberry Pi 4 RS485 Expansion Modbus HAT - DFRobot](https://www.dfrobot.com/product-2663.html)) as it’s a dual-channel expansion board? ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [7 October 2024 09:01 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/5 "2024-10-07T09:01:57Z")
@Devansh256408 The DFRobot Dual channel is is similar to the Waveshare Dual Channel. It shows up as 2 serial ports on the Pi. Both modules would do the same thing. The Waveshare one benefits from having some isolation built into the board. Considering they are about the same price, the Waveshare one represents better value for money. The USB to RS485 module will work for what you want to do. I have tested the Waveshare one, but NOT the DFRobot one. DFRobot is much cheaper and if it does the same job then all good. The Waveshare one claims to be for industrial use and has protection built in, probably why it is more expensive. I would say the DFRobot one it similar to the [MAX485 - TTL UART to RS485 Converter Module](https://core-electronics.com.au/ttl-uart-to-rs485-converter-module.html) with a TTL to USB chip inside. I will answer the other post you made after I have constructed a wiring diagram, you may find a tutorial on YouTube but it may not help. There can be a lot of misinformation on YouTube. Regards Jim EDIT: I think I watched this video when beginning the Weather Station to try and understand Modbus. [https://www.youtube.com/watch?v=FUfxETGIyUo](https://www.youtube.com/watch?v=FUfxETGIyUo) ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [8 October 2024 06:25 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/6 "2024-10-08T06:25:19Z")
Wiring to connect USB RS485 and Soil sensors. ![image](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/3/39feaca0a8fa66832996a0a5cc591cdb1ac88843.png) To set the address you use a Minimal Modbus command to write to a register. Note: you need to current address to setup the RS485 connection and it is easy to get it wrong. When setting up the Anemometer & Wind Direction devices I managed to stuff it up. The modbus commands are a bit confusing, eventually I was able to figure it out and get it right. Was a bit of a panic for a while. Once the addresses are set up the programming is also a bit tricky, happy to step you through it if you decide to go ahead. Cheers Jim ---
**Author:** ![Devansh256408](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@Devansh256408](https://forum.core-electronics.com.au/u/Devansh256408)\ **Post date:** [8 October 2024 15:04 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/7 "2024-10-08T15:04:25Z")
Thanks a lot. I will probably buy the two soil sensors and one [USB to RS485 Module / Adapter / Converter - DFRobot](https://www.dfrobot.com/product-2189.html) and set it up as you have just shown me. However, I will probably need more help with the programming and technical bit. But once again thanks for your responses. ---
**Author:** ![Devansh256408](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@Devansh256408](https://forum.core-electronics.com.au/u/Devansh256408)\ **Post date:** [18 October 2024 17:07 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/8 "2024-10-18T17:07:38Z")
![1](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/c/c9b6aaa6b8a6acd41372af472ea49b82915a1fc9.jpeg) ![2](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/0/0894f54189537b1d26c968f5f44d05e44edf1775.jpeg) ![3](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/5/532acb83448699281afafe563f2d58ec5e8e5c77.jpeg) I decided to buy the hardware, so the 2 soil sensors and the USB to RS485 module, and then I connected the sensors to the sun module as you showed in the diagram. How do I now set up my Pi 4B, what do I install, and what scripts do I run to get input from these sensors? Thank You. ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [18 October 2024 21:14 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/9 "2024-10-18T21:14:48Z")
@Devansh256408 First, use only one sensor and get that working. Both sensors have the same address, so one needs to be changed, this MUST be done with only one connected. Suggest you get both working individually before changing the address of one. It would be good to label them too so you know which is which. I am assuming you know how to use a Raspberry Pi and load the OS on a SD card. I will be using Thonny and Python as I know and have experience with them. **Pi 4B Bookworm OS** If you use the Bookworm OS you will need to setup a separate virtual environment. Decide where you want to place the program and create a folder. In my setup it is `/home/pi/WeatherStation` Run Thonny, click `Tools` tab click `Options`, click the `Interpreter` tab. In the bottom right you will see `New Virtual Environment`, click that and follow the instructions using the folder you created above. **Pi 4B Bullseye OS** You might find it better using the legacy OS Bullseye, no need to set up a virtual environment. Installing Python packages using Thonny is easier than manually using pip or something else. I only use pip if the package is not available in the PyPi database. Decided to set this up on a spare Pi 4B to be sure of the process and not rely on my memory. Next post will have more details. Cheers Jim ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [19 October 2024 01:53 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/10 "2024-10-19T01:53:57Z")
@Devansh256408 Continue from previous post. **My Setup** Pi 4B 64 bit Bullseye Python Virtual Environment. `/home/pi/MyEnv/Python` This is what the SD card in the Pi contained; previously it had been used it to explore virtual environments. The folder `MyEnv` was created and then Thonny used to set up a Virtual Environment. The folder `Python` was created after this as a place to store Python programs. **Find the Serial Port name.** Open a Terminal window, type `sudo ls /dev`, this will display all devices on the Pi Plug the RS485 USB device into the Pi type `sudo ls /dev` again, you should find a new serial device, `ttyUSB0`, it might have a different name on your Pi. The device name can be found from close examination of the two lists. Screen shot of my setup. ![03](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/4/4b2edee9d2d35523bf1cc9212c68eca3f6c8274e.png) **Run Thonny** click `Tools` click `Manage Packages` type `minimalmodbus` in search bar click on the displayed `minimalmodbus` link to instal it Once installed the name minimalmodbus should appear in the installed package list on the left Note: There is no standard for register allocation and how they are used across instruments. There is no standard for the RS485 addresses used. However the communications protocol is well defined. [Minimal Modbus Documentation](https://minimalmodbus.readthedocs.io/en/stable/readme.html). The documentation page for the [RS485 Soil Sensor(N&P&K) Arduino WiKi- DFRobot](https://wiki.dfrobot.com/RS485_Soil_Sensor_N_P_K_SKU_SEN0605) lists the information needed to access the device. - Address code: It is the address of the sensor, which is unique in the communication network (factory default 0x01). - Function code: Function indication of the command sent by the host. This sensor only uses function code 0x03 (reading register data). - Data area: The data area is specific communication data. Note that the high byte of 16bits data is first! | 07D0H | 42001 (decimal) | Device address | Read and write | 1-254 (factory default 1) | | --- | --- | --- | --- | --- | | 07D1H | 42002 (decimal) | Device baud rate | Read and write | 0 represents 2400 1 represents 4800 2 represents 9600 | The documentation page lists the string of bytes needed to communicate with the device if not using minimalmodbus. We can use this to construct miminalmodbus commands. Regards Jim ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [19 October 2024 02:25 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/11 "2024-10-19T02:25:50Z")
@Devansh256408 Continue from previous post. **Python code to access the Soil Sensors** ```auto #!/usr/bin/env python3 ############################################################################ # RS485 Setup Modbus Device # Use to read data and set Address # # Created 01 July 2024 ############################################################################ import minimalmodbus ############################################################################ # RS485 Setup ModBus ############################################################################ mb_address = 1 RS485 = minimalmodbus.Instrument('/dev/ttyUSB0',mb_address) RS485.serial.baudrate = 9600 # BaudRate RS485.serial.bytesize = 8 # Number of data bits to be requested RS485.serial.parity = minimalmodbus.serial.PARITY_NONE # Parity NONE ODD or EVEN RS485.serial.stopbits = 1 # Number of stop bits RS485.serial.timeout = 2.0 # Timeout time in seconds RS485.mode = minimalmodbus.MODE_RTU # Mode to be used (RTU or ascii mode) RS485.clear_buffers_before_each_transaction = True RS485.close_port_after_each_call = True print('RS485 Channel 1 Modbus Config:') print(RS485) ############################################################################ # Read Register Values ############################################################################ # command format: register address, additional registers, read function, decimal point # get temporary Nitrogen value data = RS485.read_register(0x1E, 0, 3, False) print ("Nitrogen = ",data) # get temporary Phosphorus value data = RS485.read_register(0x1F, 0, 3, False) print ("Phosphorus = ",data) # get temporary Potassium value data = RS485.read_register(0x20, 0, 3, False) print ("Potassium = ",data) # get address address = RS485.read_register(0x07D0, 0, 3, False) print ('Address = ',address) # should return 1 # get Baud Rate baud = RS485.read_register(0x07D1, 0, 3, False) print ('Baud Rate = ',baud) # should return 2, 0 = 2400, 1 = 4800, 2 = 9600 ############################################################################ # Changing Address ############################################################################ # WARNING: Writing to the address register will change access to the device. Be absolutely sure you know what you are doing before you change the address. Personal experience: thought I had set address 2 but had actually set 20. Panic until I realised what I had done. #RS485.write_register(0x07D0, 2, 0) # set address to 2 #RS485.write_register(0x07D0, 4, 0) # set address to 4 ``` Decide what address you want to use and edit above lines. Run the code once, then change `mb_address` to the one you set and comment out the write\_register line or remove it completely. Once you have both sensors working ok, individually, you can connect them together. The program code then needs to be changed to include both devices. Can show you how to do that when you get up to it. Cheers Jim ---
**Author:** ![Devansh256408](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@Devansh256408](https://forum.core-electronics.com.au/u/Devansh256408)\ **Post date:** [19 October 2024 12:25 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/16 "2024-10-19T12:25:00Z")
So I now have managed to make both sensors give me output via python script individually, so how do I now make them both work at once? Python script for the NPK soil sensor: ```auto #!/usr/bin/env python3 # NPK soil sensor import minimalmodbus import struct import crc16 mb_address = 1 RS485 = minimalmodbus.Instrument('/dev/ttyUSB0', mb_address) RS485.serial.baudrate = 9600 RS485.serial.bytesize = 8 RS485.serial.parity = minimalmodbus.serial.PARITY_NONE RS485.serial.stopbits = 1 RS485.serial.timeout = 2.0 RS485.mode = minimalmodbus.MODE_RTU RS485.clear_buffers_before_each_transaction = True RS485.close_port_after_each_call = True print('RS485 Channel 1 Modbus Config:') print(RS485) def read_sensor_data(): try: nitrogen_raw = RS485.read_register(0x1E, 0, 3, False) nitrogen_value = nitrogen_raw phosphorus_raw = RS485.read_register(0x1F, 0, 3, False) phosphorus_value = phosphorus_raw potassium_raw = RS485.read_register(0x20, 0, 3, False) potassium_value = potassium_raw address = RS485.read_register(0x07D0, 0, 3, False) print('Address = ', address) baud = RS485.read_register(0x07D1, 0, 3, False) print('Baud Rate = ', baud) print("Nitrogen = ", nitrogen_value, "mg/kg") print("Phosphorus = ", phosphorus_value, "mg/kg") print("Potassium = ", potassium_value, "mg/kg") except Exception as e: print("Error occurred:", e) read_sensor_data() ``` Python script for the other soil sensor: ```auto #!/usr/bin/env python3 # Temperature, Humidity, Electrical Conductivity and pH soil sensor import minimalmodbus import struct import crc16 mb_address = 0x01 RS485 = minimalmodbus.Instrument('/dev/ttyUSB0', mb_address) RS485.serial.baudrate = 9600 RS485.serial.bytesize = 8 RS485.serial.parity = minimalmodbus.serial.PARITY_NONE RS485.serial.stopbits = 1 RS485.serial.timeout = 2.0 RS485.mode = minimalmodbus.MODE_RTU RS485.clear_buffers_before_each_transaction = True RS485.close_port_after_each_call = True print('RS485 Channel 1 Modbus Config:') print(RS485) def read_sensor_data(): try: moisture_raw = RS485.read_register(0x0000, 0, 3, False) moisture_value = moisture_raw / 10.0 temperature_raw = RS485.read_register(0x0001, 0, 3, False) temperature_value = temperature_raw / 10.0 ec_raw = RS485.read_register(0x0002, 0, 3, False) ec_value = ec_raw ph_raw = RS485.read_register(0x0003, 0, 3, False) ph_value = ph_raw / 10.0 print("Moisture Content = {:.1f}%".format(moisture_value)) print("Temperature = {:.1f} °C".format(temperature_value)) print("Electrical Conductivity (EC) = {} ?S/cm".format(ec_value)) print("pH = {:.1f}".format(ph_value)) except Exception as e: print("Error occurred:", e) read_sensor_data() ``` ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [19 October 2024 19:31 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/17 "2024-10-19T19:31:51Z")
Ok, excellent; you can get values back from the sensors now. A few comments. - The python script I posted was to generate confidence in the basic reading of registers in the sensors. You don’t need to read the address and baud rate every time. > [@Devansh256408](#): > > ```auto > moisture_raw = RS485.read_register(0x0000, 0, 3, False) > moisture_value = moisture_raw / 10.0 > > ``` - If you change the False to True the returned value will be divided by 10 by minimalmodbus. - I didn’t notice both sensors are different, I can clearly that in the pic now and they are linked in the first post. Apologies. To get them to work together, the address of one needs to be changed. Python Code to change address. Run once. To change back, swap the address numbers. Doesn’t have to be 1 or 2, any number from 1 to 247 is ok. ```auto #!/usr/bin/env python3 # Change Address import minimalmodbus mb_address = 1 change_address = 2 RS485 = minimalmodbus.Instrument('/dev/ttyUSB0',mb_address) RS485.serial.baudrate = 9600 # BaudRate RS485.serial.bytesize = 8 # Number of data bits to be requested RS485.serial.parity = minimalmodbus.serial.PARITY_NONE # Parity NONE ODD or EVEN RS485.serial.stopbits = 1 # Number of stop bits RS485.serial.timeout = 2.0 # Timeout time in seconds RS485.mode = minimalmodbus.MODE_RTU # Mode to be used (RTU or ascii mode) RS485.clear_buffers_before_each_transaction = True RS485.close_port_after_each_call = True # get current address address = RS485.read_register(0x07D0, 0, 3, False) print ('Current Address = ',address) print('To change address type ??') change = input() if change == 'YES': RS485.write_register(0x07D0, change_address, 0) print('Address changed to',change_address) else: print('Address NOT changed.') ``` Suggested code to access both sensors. ```auto #!/usr/bin/env python3 # NPK soil sensor # Temperature, Humidity, Electrical Conductivity and pH soil sensor import minimalmodbus import struct import crc16 NPK_address = 1 NPK = minimalmodbus.Instrument('/dev/ttyUSB0', NPK_address) NPK.serial.baudrate = 9600 NPK.serial.bytesize = 8 NPK.serial.parity = minimalmodbus.serial.PARITY_NONE NPK.serial.stopbits = 1 NPK.serial.timeout = 2.0 NPK.mode = minimalmodbus.MODE_RTU NPK.clear_buffers_before_each_transaction = True NPK.close_port_after_each_call = True TEMP_address = 2 TEMP = minimalmodbus.Instrument('/dev/ttyUSB0', TEMP_address) TEMP.serial.baudrate = 9600 TEMP.serial.bytesize = 8 TEMP.serial.parity = minimalmodbus.serial.PARITY_NONE TEMP.serial.stopbits = 1 TEMP.serial.timeout = 2.0 TEMP.mode = minimalmodbus.MODE_RTU TEMP.clear_buffers_before_each_transaction = True TEMP.close_port_after_each_call = True def read_NPK_sensor_data(): try: nitrogen_raw = NPK.read_register(0x1E, 0, 3, True) phosphorus_raw = NPK.read_register(0x1F, 0, 3, True) potassium_raw = NPK.read_register(0x20, 0, 3, True) print("Nitrogen = ", nitrogen_value, "mg/kg") print("Phosphorus = ", phosphorus_value, "mg/kg") print("Potassium = ", potassium_value, "mg/kg") except Exception as e: print("Error occurred:", e) def read_TEMP_sensor_data(): try: moisture_raw = RS485.read_register(0x0000, 0, 3, True) temperature_raw = RS485.read_register(0x0001, 0, 3, True) ec_raw = RS485.read_register(0x0002, 0, 3, False) ec_value = ec_raw ph_raw = RS485.read_register(0x0003, 0, 3, True) print("Moisture Content = {:.1f}%".format(moisture_value)) print("Temperature = {:.1f} °C".format(temperature_value)) print("Electrical Conductivity (EC) = {} ?S/cm".format(ec_value)) print("pH = {:.1f}".format(ph_value)) except Exception as e: print("Error occurred:", e) read_NPK_sensor_data() read_TEMP_sensor_data() ``` The tricky part is changing the address, when setting up the Wind Direction and Wind Speed sensors I managed to stuff it up. Set the address to 20 instead on 2. Caused me panic as I thought I had broken the sensor. Anyway … Regards Jim ---
**Author:** ![Devansh256408](https://avatars.discourse-cdn.com/v4/letter/d/9f8e36/32.png) [@Devansh256408](https://forum.core-electronics.com.au/u/Devansh256408)\ **Post date:** [20 October 2024 08:08 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/18 "2024-10-20T08:08:56Z")
Thank you a lot, Jim. I appreciate how much you helped me. I finished the whole setup with both sensors working simultaneously. Thanks. ---
**Author:** ![James46717](https://avatars.discourse-cdn.com/v4/letter/j/e5b9ba/32.png) [@James46717](https://forum.core-electronics.com.au/u/James46717)\ **Post date:** [20 October 2024 08:46 UTC](https://forum.core-electronics.com.au/t/usb-to-rs485-module-with-modbus-rtu-rs485-soil-sensor-on-raspberry-pi-4b/20979/19 "2024-10-20T08:46:03Z")
Good to hear !!!