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As long as you are only using one serial device at a time and aren't plugging it in and out quickly it will always be ttyUSB0. D device: Display detailed information about device. s bus:devnum Show only devices in bus and/or devnum (decimal ) -d vendor:product Show only devices with the specified vendor:product ID. Id suggest that you go to the device in question, for example: ls -l /dev/ttyUSB0 and obtain the major and minor node numbers. However, this is a bit tricky (and the subject of a different question), so unless this really becomes a problem for you, don't worry about it. Class descriptors will be shown for USB device classes including hub, audio, HID, communications, and chipcard. There are ways to make sure a device always has the same dev node name when you plug it in, a name you assign to it. Sometimes a USB interface dev node may end up remaining in existence for a bit after you remove the device, so, e.g, if you unplug the device and then plug it in right away again, it may end up as ttyUSB1 even though you never had two devices plugged in at the same time. But if you removed the original one after plugging the second one in, ttyUSB0 would disappear, but ttyUSB1 would still exist (i.e., they don't get re-assigned as long as they remain plugged in). However, if you unplugged the original one first, that dev node interface would be removed, and the new one would probably end up as ttyUSB0. So, if you plugged another serial device into another USB port with the first one still plugged in, that would be ttyUSB1. It's based on the order in which the interface is created by the kernel (notice, no serial devices plugged in, no ttyUSB entries in /dev). The device node name is not based on a static numbering of the USB ports, such that if you plugged it into the port next over you would get ttyUSB2 instead.
Lsusb device id tty trial#
In this case it looks to be ttyUSB0.īy the way, how do I know which port (out of the 4) has a serial port? by trial and error?Īll the physical USB ports on the pi are equivalent none of them has any special properties relative to another. Serial device attached to USB ports will generally end up with that in their name. When you're done, rm dev*.txt to delete the two files. Plug it in, do it again, check what's changed: ls -1 /dev > dev2.txt On my system these match the bus and device number mentioned in the device hotplug entries in /var/log/syslog.A refinement to oh.dae.su's method: dmesg | grep "tty"Īnother trick would be to save the state of /dev before plugging it in: ls -1 /dev > dev.txt The directory /sys/devices/pci0000:00/0000:00:13.5/usb1/1-3/ and its subdirectories have much information on the device. In the output from the command you will see something a little like: Bus 001 Device 005: ID 12d1:1446 Huawei Technologies Co., Ltd. Bus 001 Device 004: ID 413c:2107 Dell Computer Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. ( char, because a tty is a character device, if you were tracing down a disk device you would specify block instead of char) Code: Select all rootraspbx: lsusb Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp. I'd suggest that you go to the device in question, for example: ls -l /dev/ttyUSB0Īnd obtain the major and minor node numbers. Since I don't have your hardware I can't give you an exact answer. I'm using Ubuntu Server 10.04 and I tested the tools: lsusb By example I need to get the following: /dev/ttyUSB0 -> Bus 001 Device 006 E220 HSDPA Modem / E270 HSDPA/HSUPA Modemīus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubīut I want to know which device is related with which Bus Device.
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E220 HSDPA Modem / E270 HSDPA/HSUPA Modemīus 001 Device 007: ID 12d1:1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E270 HSDPA/HSUPA Modemīus 001 Device 006: ID 12d1:1003 Huawei Technologies Co., Ltd. If I do lsusb the output is: Bus 001 Device 004: ID 12d1:1003 Huawei Technologies Co., Ltd. An issue is that I have three dongles with the same id vendor and id product. I have all tools but I can't link my /dev/ttyUSBx to physical BUS and DEVICE. lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux. To run lsusb, you can type lsusb directly from console.
Lsusb device id tty manual#
I need to write an script for restart USB dongles. From its manual page, lsusb is defined as: A utility for displaying information about USB buses in the system and the devices connected to them.