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

Dave dave at g8kbv.demon.co.uk
Tue Feb 7 13:08:44 UTC 2012

On 6 Feb 2012 at 11:27, Charles Blackburn wrote:

> I have the same issue under linux, try going into the device
> properties and telling windows not to turn it off. Istr its in the
> last tab in the device properties before you get to the hardware tab.
> Not sure, not at home at the minute
> charlie


I ran Memtest86 overnight, 2 full passes, no errors.

I also found a power management dialog behind the "Advanced" link in the 
power settings properties dialog.  (The one you get clicking on the icon 
in the notificaiton area.)  It's now set to "Disable" any power 
management for any USB port...  I forget the exact phrase.

For the "other" radio control software I've created, I found I had to add 
short delays between the call's that sends the data byte, and the calls 
that then wait's for a response.  30ms seems optimum, but it's 
configurable from a .ini now.

There seems to be layer upon layer of buffers these days between the 
application, and the wires to the outside world, also some "smart" 
(alegedly) stuff that seems to try and pre-empt what you want in the name 
of speed.   That issue at least has now been fixed, but I'll test the 
HRD/DM780 issue later.

I also found and flipped the Restart after failure switch, so I should be 
able to see the full error when it fall's over unatended now.

I've also got an idea how to hack the newer FTDI drivers that wont 
recognise the older FTDI chipset based other OEM branded device I have.

I'll report back when I've meddled some more.


Dave G0WBX.

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