4/11/2024 0 Comments Hl 340 usb serial adapter driverAre 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. USB to RS232 conversion cable for USB and serial devices easily connect serial devices with features such as Plug and play, hot-swappable. 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. This is HL-340 USB serial port (COM) USB to RS232 USB Nine Serial Line Support Windows 7-64. 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. I am running Windows 11 with the preview build of WSL to enable USB support via usbipd. A FORSan unit from Amazon gave no reply at all. I purchased a HL-340 USB-RS232 adapter, and the MAcBook Pro wont recognize it. 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. On this lsusb says all the new units I purchased use the QinHeng usb to serial adapter and require the associated HL-340 driver. 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. Ive tried checking the manufacturers website, various online driver databases, and even forums, but to no avail. I tried to replace the usb unit last month. Ive been searching high and low for the driver for the Adapter USB Serial HL-340, but Im unable to find it anywhere. 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. For those that do not know this device it is an OBDII scanner interface.
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