- PROLIFIC USB TO SERIAL COMM PORT VERSION 3.3 2.105 DOWNLOAD SERIAL
- PROLIFIC USB TO SERIAL COMM PORT VERSION 3.3 2.105 DOWNLOAD DRIVERS
- PROLIFIC USB TO SERIAL COMM PORT VERSION 3.3 2.105 DOWNLOAD DRIVER
I started to suspect that there actually was another program that was disrupting the USB communications or hogging the COM port. This program was not able to open the COM ports either, indicating they are in use.
PROLIFIC USB TO SERIAL COMM PORT VERSION 3.3 2.105 DOWNLOAD SERIAL
I downloaded another program called Portmon ( a serial port monitoring program). I even downloaded a different emulator program (Teraterm) which was unable connect to the COM ports (prolific or FTDI adapters).
PROLIFIC USB TO SERIAL COMM PORT VERSION 3.3 2.105 DOWNLOAD DRIVER
Clearly this was not a hardware or driver issue. Fustrated, I ended up buying a FTDI based USB-Serial adapter cable (Model USA-FTDI-A12). I tried every version of the driver I could find and still no luck.
PROLIFIC USB TO SERIAL COMM PORT VERSION 3.3 2.105 DOWNLOAD DRIVERS
After some intense web searching, I came across a lot of posts about how these drivers are complete crap and they are very finicky about how they are installed. I was not able to open the COM port with Hyperterminal. I tried connecting to the COM using hyperterminal and kept getting an error stating ' Another program is using the selected telephony device. I was not aware of any other programs utilizing the COM ports. I kept getting an error in labview indicating that the VISA resource is valid but the program cannot access the resource. My Labview program could no longer access the device, even when I programatically entered the correct COM number. Everytime I would plug in the adapter the COM port number changed. I made the silly mistake of unplugging the USB to serial adapter and plugging it back in. My labview program was able to communicate properly with a syringe pump I was controlling. When I first installed the USB-Serial adapter, it showed up as COM3 an everything worked great. The story begins when I bought a Trendnet TU-S9 USB adapter that uses the Prolific PL2303 driver.
I just solved the problem and thought I would share my experience in case it may help others. Okay, I have had a living nightmare trying to get a Prolific USB-RS232 Serial adapter working with my Labview program.
Hard Drives WDC WD3200BEVT-22A23T0 3 partitions S/N W -DXW167AM03248 Size 298.09 GB Internet Speed 6690 Antivirus Avast Pro Browser Firefox 28 Other Info Sound: Card 1 - Microsoft High Definition Audio Device Card 2 - High Definition Audio Device Card 3 - High Definition Audio Device Card 4 - NVIDIA Virtual Audio Device (Wave Extensible) (WDM) Card 5 - NVIDIA High Definition Audio Card 6 - NVIDIA High Definition Audio VideoController1 - NVIDIA GeForce GT 425M Video Processor - GeForce GT 425M Video Driver Version - 9. I never had an adapter with the WCH processor mentioned earlier in this thread, but that will probably be the next I will buy and test. Sometimes it works with Windows 7 sometimes not. Prolific is the one that is most unreliable.
No serious troubles, only sometimes Windows can't open the port in the first try and I have to restart. The FTDI chip works perfectly with all versions of Windows, the Silicon Labs works mostly fine too. By looking inside the adapters I found out that they all contain one of these 3 processor chips: FTDI, Prolific and Silicon Labs. Some work with Windows 7 32/64 some don't. I have about 8 different usb - serial adapters that I have bought over the years, all of them are from different manufacturers.
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