Note, I'm not asking how to use lsusb. Yes, I know you can use lsusb or libusb to get device serial number, product ID, manufacturer name, etc. But as far as I can tell, nothing shown by lsusb can be cross-referenced with a /dev/video* path.
Logilink Usb To Serial Code 10
returns the Serial number of my camera (a Logitech HD Pro Webcam, used as an example with the correct Vendor:Product codes obtained from a previous use of lsusb). Please notice that the use of sudo is absolutely necessary: an unprivileged user does not get access to all info available thru the command.
The serial number is often, but not always, unique. If it is not unique (just compare the output of the above commands for two devices with the same Vendor:Product codes), you can set them so that they are distinct. There are guides all over Google for doing that, I will merely point to a couple of them, for the sake of thoroughness: here and here. But remember, this is a device-dependent procedure, so you will have to find out how to do it for your very own camera.
I had same problem too. I needed to identify 6 usb cameras connected to raspberry pi with 1 more usb hub. 6 cameras have all identical vendor id, model name and serial #. Whenever I turned off and on I was able to handle the cameras using '/dev/video0' ... '/dev/video5'. But I found that '/dev/videoX' was not always assigned to the same camera. So I've spent some time to solve this problem and finally solved it by using the bus#. Below is my raspberry pi's command result.
I have a usb camera I use for showing work I'm doing via a screen-share with my colleagues. I use VLC to just put the video feed in a window, so it can be seen next to the code I'm developing. This is a specific example, but the commands here will work for any programmatic use case.
A USB UART adapter is used to access the serial console of the Raspberry Pi from a development host such as a laptop or desktop PC. The USB end connects to the PC and the UART header end connects to the USB. While it is possible to connect the USB end to another Raspberry Pi, this configuration has not been tested unless explicitly mentioned against an individual entry below.
HDMI to VGA converters do work, they convert the digital serial data streams from HDMI and using complex logic, and digital to analog converters they convert the HDMI signal to the analog signals needed for VGA, and sometimes also convert HDMI audio to an analog stereo signal. But note that if they feed off the PI it can cause a problem, as the PI only is designed to provide about 50mA to the (HDMI or DVI-D) monitor, and these adapters use >200mA, while the absolute maximum the PI can let through is 200mA.These adapters also thus use about half the energy that the PI (without USB devices) uses.Therefore its much better to use an adapter that has an external power input. Alternatively there are HDMI dongles (male to female HDMI adapters) that have a barrel input connector to feed the adapter with.
I will be moving from PC to Mac, but will need to run a Windows application that uses a serial port, using boot camp. Would I be right in thinking I would need to install this adapter under Windows using a Windows driver?
Loaded it all up fine, however my main purpose was that so I can telnet to devices on the serial port.My question is running the telnet what would I put after the telnet command to identify the port,
Fazed, I would l look baud rate you are using for your device. I just had a similar issue connecting to an APC UPS management interface. if you are using screen try this command: screen /dev/cu.usbserial (Baud Rate). The baud rate is standard 9600 but you can change it by typing in the baud rate you wanna use i.e. 2400.
After following these directions, and the install of the PL2303_1.4.0 appearing to be successful, I do not see the USB serial monitor option anywhere. Whether I look on system preferences under network or in terminal.
The adapter card is based on a native single chip design, that allows you to harness the full capability of PCI Express (PCIe) - providing optimum reliability and speed while reducing the load applied to the CPU by as much as 48% over conventional (bridge chip) serial cards.
Plus, the adapter card includes an optional half-height/low profile bracket that allows the card to be installed in virtually any computer case - making it that much easier to add serial ports to a PCI Express enabled computer, regardless of the size of the computer case.
Note: If you are using a serial card that uses the OxPCIeMf file and installation fails, repeat steps 4 to 9, then browse to the Windows folder. Browse to the Serial Port Driver folder and click the oxserleg file. Click OK, and then click Next.
Note: If you are using a serial card that uses the OxPCIeMf file and installation fails, repeat steps 4 to 10, then browse to the Windows folder. Browse to the Serial Port Driver folder and click the oxserleg file. Click OK, and then click Next.
When you troubleshoot issues with a serial device, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:
You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session. When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.
Layouts of a typical MIDI setup (a) and of the SMIDIBT setups that can be used to test the latencies of MIDI messages that are sent through computers and MIDI serial devices (b), the latencies of MIDI and audio from percussion pads (c), and the latencies of audio generated by MIDI sound modules (d). Each of the three components that can be sources of latencies in a typical MIDI setup is represented in panels b (middle section of a typical MIDI setup), c (first section of a typical MIDI setup), and d (final section of a typical MIDI setup). The OUT audio and voltages can be compared in to her measure the veridical timing between inputs and outputs
The SMIDIBT contains schematics and code (Arduino IDE and MATLAB) to facilitate the accurate benchmarking of MIDI sound modules (and other MIDI devices) using an Arduino MIDI setup in conjunction with any audio sound card (i.e., digital mixer), analog input box, or oscilloscope. These tools are designed to allow experimenters to assess the audio latencies of their device and sound bank(s) prior to commencing experiments. Because it is not possible to comprehensively test the latencies of every available configuration, the present experiments focused on a selection of devices and sound banks that share similar sound bank names and, also, the sounds that demonstrate the lowest and highest latencies for each device. I provide examples of how the SMIDIBT can be used, and present a subset of results from my own tests using an informed selection of devices. Since it is near impossible to test every MIDI device available, the SMIDIBT and associated scripts used in this experiment are freely available so that other researchers can benchmark their own MIDI devices and report the latency of their chosen apparatus and stimuli within their articles.
The descriptive and inferential statistics for FSR-to-MIDI latencies in Supplementary Material 2 further support this proposition, with large differences between the ranges for the various instruments within devices. However, it would be impossible to know the precise source of these differences without first examining the software and code operating within each device.
USB was originally designed to replace the motley assortment of cables coming out of the backs of personal computers with their big inconvenient connectors which were USB's predecessors: parallel and serial connections. USB 1.0 was introduced in 1995 but wasn't standardized in computers until 1998 when Apple Computers came out with the iMac G3. USB 1.1 was soon developed after that to help solve problems with the initial USB adoption process.
Though some might argue that Serial port are things in the past, it is still the most popular port for those who are into electronic DIY. Building electronic device with serial port interface is cheaper than buiding one that uses USB. That is the reason why people still sell USB-Serial adapter to those electronic DIY enthusiast.
Bonus: What application benefits from usb-serial port adaptor?For starters, there are modems which uses RS-232 serial port. Some home-made devices includes Infrared remote control which uses LIRC which also depends on the serial port.
Can someone help with an email to jberry@geifuelcells.com if you have a link to some other code that has worked with REDHAT linux to just open USB port for serial text communcations. It so simple, it should work.
Thanks to you Mypapit, I can run my RS232 serial microchip picstart programmer under linux using mplabx and usb.My old Windows ME laptop finally died and I am resisting the wine solution.Cheers Lester 2ff7e9595c
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