Order Tray | Contact Us | Home | SIG Lists

[aprssig] Prolific USB<>RS232 woes (Was Re: New tablet usable for APRS.)

KB1TX at aol.com KB1TX at aol.com
Thu Feb 2 14:41:28 UTC 2012

I had similar problems with USB/232 and Byonics TT 3 and 4. Byon suggested  
I use the driver they use, and it loads as ports 8 and 15 on my HP desktop  
running Windows 7 -32.
It may take several tries to get it to load completely. My system loses the 
 internet connection after a couple seconds of the download, but eventually 
I get  it all.
Arthur L Smith

Chocorua, NH, USA 

In a message dated 2/1/2012 6:58:53 P.M. Eastern Standard Time,  
dave at g8kbv.demon.co.uk writes:

While on  the subject of USB<>RS232...

Does anyone have any idea what the  trouble is with the recent Prolific 
drivers, on XP, Vista and 7 (32  bit.)  Myself and others have found that 
many Ham applications can  have trouble now when using such chipset based 
adapters, ranging for  scrambled communications, to random BSoD's.

HRD/DM780 for instance  causes BSoD's at random times with my TS870, but 
DM780 on it's own works  fine for hours at a time.  HRD will sometimes 
BSoD on it's own when  using any of the Prolific adapters I've tried, with 
radios that have a  very busy remote IO link..

A program I have to control an old Skanti  radio, that uses a low speed 
byte by byte handhaked protocol, just refuses  to work with the Prolific 
based adapters in any way.

However, an  older FTDI based adapter works 100% with everything!  Pitty, 
it's  drivers don't run on 7, and those that do, wont recognise the 'good'  
adapter.  (PID/VID issues, customised in the hardware, and of course  you 
can't successfully "Hack" signed drivers any more.)

All the  apps work fine too on W2k/XP etc, on hardware based "Real" COM 
port's  (Antique ISA cards, and MoBo based etc.)   On one XP machine where  
I can have real COM ports, the FTDI and Prolific adapters installed,  
everything other than the Prolific hosted ports work.

We've tried  altering or disabling the FIFO buffers, and so on, with 
little effect that  is any better.   I've tried both sets of currently 
available  drivers from Prolific's website, also those supplied with some 
of the  adapters on mini CD.  All have issues.

The problem seems to be  with data received from the "device" getting lost 
or scrambled between the  outside world and the application.  The BSoD's 
are also worrying,  buffer overflows?

Data line signal voltages and waveforms look good  too, as much as you can 
tell with a 'scope that is.  (+-6V, just like  the FTDI based devices.)

Any thoughts from the collective?     We've not seen any of the infamous 
"Error 10" problems, alegedly caused by  "Fake" chipsets, so we're at a 
bit of a loss after several weeks  trying.


Dave G0WBX.

On 31 Jan 2012 at 9:44,  david vanhorn wrote:

> For what it's worth, my  Acer Iconia A500 (android or windows models
> available) has a USB host  port that works with the common serial port
> adaptors, plus bluetooth  and  wifi.

aprssig  mailing  list
aprssig at tapr.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tapr.org/pipermail/aprssig/attachments/20120202/28900090/attachment.htm>

More information about the aprssig mailing list