![]() Are these all junk or am I doing something dumb? The usb unit I lost had a different usb interface and worked fine using a prolific driver. My question is whether anyone has been successful accessing auto data with one of these units and if so how? I suppose it could be a driver issue on my system, but as I said I also tried with several Windows systems and the behavior was the same. Conversely I now have two Bluetooth ELM327 units and once connected in Linux with rfcomm these work fine with my console software or the 'screen' program. None of these recognize the device and won't connect, presumably due to its non-ascii replys to standard OBDII AT commands. Have also tried a couple of the Windows and Linux Xwin graphical ELM327 programs. Most of my tests were done in Linux, but to be sure I borrowed an laptop with Windows Vista installed and it behaved the same way. A FORSan unit from Amazon gave no reply at all. I purchased 3 from Ebay all give a reply, but its not ascii, typically the high order bit in each reply character is set so a graphics style char is displayed rather than ascii. I've written my own code to send commands and read replies, but they are supposed to work fine with a serial terminal interface like 'Putty' or the linux 'screen' program however they don't. These are supposed to reply to ascii commands with ascii text in reply. I suspect all are some sort of clone from China, but none of these work properly. ![]() When communication with the device resumes, the device can leave the suspend state and resume the working state. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. On this lsusb says all the new units I purchased use the QinHeng usb to serial adapter and require the associated HL-340 driver. Starting in Windows 10, Usbser.sys supports USB Selective Suspend. I own and normally use a laptop running a Slackware 14.1 linux distribution. So far I have ordered 4 of these and none appear to work properly. I tried to replace the usb unit last month. I seem to have miss-placed both although I still have a Bluetooth unit that works fine. I am trying this post here as there were a couple posts about this device back in 2016, but nothing about the current series with the QinHeng serial adapter.Īt one time I owned both an rs232 serial ELM327 and a usb unit. Per below I am having trouble purchasing one with the USB interface that works. Its an inexpensive device that plugs into a vehicle under the dash near the steering wheel and allows viewing the cars built in diagnostic codes on a PC. In this case, the error appeared on a Linux when trying to upload code due to the drivers not being installed and the root permissions.For those that do not know this device it is an OBDII scanner interface. language:bashĪvrdude: ser_open(): can't open device "/dev/ttyUSB0": No such file or directory You may receive an avrdude: ser_open(): can't open device error similar to the output shown below. If you installed the drivers for the CH340 on your computer but have issues connecting via serial terminal or uploading code using the Arduino IDE, there may be an issue with your user settings preventing you from using the CH340. COM Port Not Available Windows, Mac, and Linux Users seem to be able to eventually get the board recognized by a combination of giving the computer time to finish the install ( close to 20 min), plugging the board back in multiple times, reinstalling the drivers, and/or resetting the computer multiple times ( repeat both steps). Others have had issues where the installation process hangs.īased on the customer experiences, this might be specific to the manufacturer and are usually isolated cases. ![]() ![]() However, the board cannot be accessed on the Arduino IDE. We have had a few reports on Windows 10 where the driver will automatically install and the board will show up under a new COM port as USB-Serial CH340, but with a different device name. ![]() Troubleshooting COM Port is Not Showing Up as CH340 Windows ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |