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Post: Hello The first thing I would suggest is you check that the UART port on your Raspberry Pi is working correctly. We have a tutorial [url=https://www.abelectronics.co.uk/kb/article/1035/serial-port-setup-in-raspberry-pi-os]Serial Port setup in Raspberry Pi OS[/url] which goes through the steps needed to enable the UART serial port on a Pi Zero W. After going through the tutorial you can check if the UART serial port is working correctly using the [b]minicom [/b]terminal program. Install minicom using the command: [pre][code]sudo apt-get install minicom[/code][/pre] Once installed, remove the RS485 Pi from your Raspberry Pi and connect the UART TXD (pin 8) and RXD (pin 10) pins together on the Raspberry Pi GPIO header so anything transmitted on the TXD pin is echoed back to the RXD pin. Start minicom with the following command: [pre][code]minicom -b 115200 -o -D /dev/ttyAMA0[/code][/pre] If the UART port is working anything you type into the minicom terminal should appear on the screen. If nothing appears when you type there is a problem with the UART port and you may need to go through the steps in the setup tutorial again. Once you know that the UART port is working you can install your RS485 Pi and connect it to your weather station. There is a python library called minimalmodbus which may help you with communicating with your weather station. You can find it at [url=https://pypi.org/project/minimalmodbus/]Minimalmodbus[/url] The website contains some [url=https://minimalmodbus.readthedocs.io/en/stable/usage.html]sample code[/url] that may be useful to get you started. You will need to set the serial device to point at [b]/dev/ttyAMA0[/b] to work on the Raspberry Pi. Hopefully, this should help get you going with your project.