It could be fixed by swapping RX and Ground wires, but. It seems like those cheap PL2303 boards are designed for TTL 3.3v signal levels and while they can handle UART 5v voltage, data becomes inverted. However I was able to see the pattern in that message and it could be possibly decoded. After several liters of coffee I realized that on Mac and Windows I had to revert RX and GND for uknown reason, otherwise message text was garbled. I was shocked and overwhelmed - it works with Mac, works with Windows 8 and 10 PCs, but not on Linux, even with latest kernels and drivers. I spent a day backporting 4.19 driver to old kernel and recompiling, bricked and restored my Linux PC several times and finally got it working, but not with Midnite KID. Previous driver could possibly work with 'cheap UART TTL 2303' converter, but most of the time it refuses to. To handle HX series there was a patch in pl2303.c driver around kernel 4.2 adding a thing called TYPE_HX mode. There is completely other story with Linux drivers. It could be easily fixed using old drivers, as with the link above or here: To cut some tails they managed to change latest Windows drivers rendering them incompatible with fakes. Prolific itself never produced HX chips, only HXD. So, first of all, there are tons of fake PL2303 chips, most of them are called PL2303HX. Part #'s SW-1314, SW-1318, and other FTDI based adapters:Well, sorry for necroposting, but I want to share some interesting information on PL2303 and Midnite devices. Plug the USB-to-Serial Adapter cable into your USB port. ![]() Follow the prompts to extract and run the dmg file. Click here to download the driver for MAC OS X.USB to Serial Support Mac How to Install the Driver: Part # SW-1301 and other Prolific based adapters: If you are having problems with the USB-to-Serial Adapter in Windows that this page does not address, please contact us at or call (800)709-1345 between 7 AM - 6 PM MST. You may have to run the software that came with your device to make it rescan the COM ports. Notice that the device will show up as being on the same COM port that it was before (i.e., COM5), but will show up on the new port if you close the Device Manager and open it again. Pull down the scrollbar on the bottom, left side and select COM 1, 2, 3 or 4 (NOTE: Choose one that does not say "in use" next to it).Right click on the "Prolific USB to Serial Port" and click on Properties.How do I change the COM port on my USB to Serial adapter? If the adapter is installed on COM5, a device with such a limitation will not work until the COM port is reassigned to COM1 - COM4. would not work with a USB to Serial adapter when everything appears to have installed fine is that some devices will only scan a limited number of COM ports.įor instance, it is very common for a PDA to have a limitation of scanning the first four (or sometimes two) COM ports. The most common reason that a device such as a PDA, GPS, cell phone, etc. Troubleshooting The driver is installed properly, but the device is not working: If the device is installed properly, you will see "Prolific USB to Serial Com Port.".Click on the plus sign (+) next to "Ports.". ![]() ![]()
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