Jan 29, 2010 From what I can see perusing some Ubuntu Linux forums, the HL-340 is not a PL2303 device, but rather a CH341 device. That is why you don't see the osx-pl2303 driver in your Extensions list. The extension will only be loaded if a supported device is plugged in. There does not appear to be a Mac OS X driver available for CH341 devices. Jun 03, 2018 USB SERIAL HL 340 DRIVERS FOR MAC - USB serial driver not getting installed Hi I am trying to install a gadget serial driver 2. If the folder contains a driver, make sure it is designed to work with Windows for Similar help and support threads. By Roberto, April 13, Your recently viewed items and featured recommendations. See all 3 reviews. To manually install the USB to Serial drivers on Windows Vista 64-bit operating systems. Select Locate and install driver software. If the driver isn't found automatically, select Don't have a disc. Show more options. Select Browse my computer for drive software.
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:
Serial cables
Serial ports
Serial devices
To test your setup components, try the following:
Use the serial cable, serial port, and serial device in another setup to see if the problem is with the components or the setup.
Use a different serial cable, serial port, and serial device in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.
When you test your cables, it is recommended that you do the following:
Test each cable individually.
Use short cables when you are testing.
When you test the serial ports and serial device, it is recommended that you do the following:
Hl-340 Usb Serial Driver Mac Os 7
Press the Windows key + R, type devmgmt.msc, and press Enter to open Device Manager. Check to see if your device is listed under Ports (COM & LPT).
Make sure that the COM port number is the correct number for the serial device and that the software being used to connect the computer to the serial device uses the correct COM port number.
If the device is listed with an error, follow the instructions on the website to reinstall the drivers.
Hl 340 Usb Serial Adapter
Note: Some serial devices work only if the COM port number is between a certain range. For example, COM1 to COM4.
Perform a serial loopback test. See this FAQ on how to perform a RS-232 serial loopback test: http://www.startech.com/faq/serial_loopback_test_rs232_windows