We now have to take our previously written list and look for the characters after “usb”. The info we get here, are all the attributes of the complete chain of devices linked to the specified USB port. Udevadm info -name=/dev/ttyUSB0 -attribute-walk For the device connected to ttyUSB0 for example, we have to enter following command in the Terminal : Using the automatically assigned USB port numbers we wrote down previously, we are able to find the attributes for all our devices. Typically these attributes are : vendor ID, product ID, serial number. We’re looking for the attributes which have unique properties. To be able to recognize a connected device later, we’ll use some specific attributes of that device. Look for the attributes of your connected devices If you have more than 2 connected devices, continue this process by connecting one by one each additional device to your Pi. the automatically assigned USB port : in our case : ttyUSB1.the characters after “usb” : in our case : 1-1.3.the name of your second connected device : in our case : DEVICE2.Have a look at the newly added line on your Terminal and add following information to the list you just started : Once your Pi is up and running, connect the first device and open the Terminal window. The easiest way to figure this out is to disconnect all devices and reboot your Pi. Figure out the connected devicesįirst, we need to find out which device has been assigned to which USB port number. Prepare your Piįor this tutorial, you need to have your Raspberry Pi running on Raspberry Pi OS. Afterwards, it will allow you to use this USB device list with self-assigned names in your scripts. After completed this tutorial, you will have a USB device list with a fixed USB port name to each connected device. In this tutorial we’ll learn how to assign a fixed USB port name for each connected device. Your USB device assigned to ttyUSB1 could be suddenly assigned the ttyUSB0 port number for example. If you have multiple devices connected to the USB ports of your Raspberry Pi, the automatically assigned USB port number could unexpectedly change after a reboot and could end up confusing when using this USB port number in your scripts or Node-RED flows.
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March 2023
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