I've purchased one already made by "Cypress Semiconductor" but it
doesn't work. The VID is 04b4 and the PID is 5500.

Can anyone suggest a USB to RS232 adapter that does its job perfectly
100% of the time under Microsoft Windows, i.e. it trully behaves
exactly just like any other serial port?

On Jun 12, 8:39 pm, Tom=E1s =D3 h=C9ilidhe <t...@lavabit.com> wrote:
> I've purchased one already made by "Cypress Semiconductor" but it
> doesn't work. The VID is 04b4 and the PID is 5500.
>
> Can anyone suggest a USB to RS232 adapter that does its job perfectly
> 100% of the time under Microsoft Windows, i.e. it trully behaves
> exactly just like any other serial port?

We've had no end of problems with USB to RS232 adapters
that only work sometimes, or at certain baud rates, etc. The
best we've found is Belkin. If you're lucky you'll get one with
current software. No idea if Vista drivers are available or working,
but under XP Belkin is OK.

Hope this helps !
Best Regards, Dave

If you're looking for an embedded solution, take a look at the FTDI modules.

-- 
------------------------------------------------------------------------------------
Free Software - Baxter Codeworks   www.baxcode.com
------------------------------------------------------------------------------------

"Tomás Ó hÉilidhe" <t...@lavabit.com> wrote in message 
news:9...@34g2000hsf.googlegroups.com...
>
> I've purchased one already made by "Cypress Semiconductor" but it
> doesn't work. The VID is 04b4 and the PID is 5500.
>
> Can anyone suggest a USB to RS232 adapter that does its job perfectly
> 100% of the time under Microsoft Windows, i.e. it trully behaves
> exactly just like any other serial port? 

Tomás Ó hÉilidhe wrote:
> 
... snip ...
> 
> Can anyone suggest a USB to RS232 adapter that does its job
> perfectly 100% of the time under Microsoft Windows, i.e. it
> trully behaves exactly just like any other serial port?

Impossible.  USB is not a serial port.

-- 
 [mail]: Chuck F (cbfalconer at maineline dot net) 
 [page]: <http://cbfalconer.home.att.net>;
            Try the download section.


** Posted from http://www.teranews.com **

Tomás Ó hÉilidhe wrote:
> I've purchased one already made by "Cypress Semiconductor" but it
> doesn't work. The VID is 04b4 and the PID is 5500.
> 
> Can anyone suggest a USB to RS232 adapter that does its job perfectly
> 100% of the time under Microsoft Windows, i.e. it trully behaves
> exactly just like any other serial port?

see:
http://www.dontronics-shop.com/easysync-premium-gold-usb-rs232-adapter-cable-10cm-cable.html

I can't guarantee 100%, and nobody can, but this is what it says on my 
advertised page:

Dontronics Guarantee: These converters are packed in a plastic envelope 
that can easily be re-packed without any damage. If you purchase this 
product, and it doesn't work for you, return it in a re-sellable 
condition, that is, in the same condition that it was delivered to you, 
and will will refund your money in full, provided you return it within 7 
days of receiving it.

and read the user comments/feed back near the bottom of the page.

These use the FTDI chips, and in fact are manufactured by FTDI under the 
Easysync brand name.

Cheers Don...


-- 
Don McKenzie

Site Map:            http://www.dontronics.com/sitemap
E-Mail Contact Page: http://www.dontronics.com/email

Intelligent 2.83" AMOLED with touch screen for micros:
http://www.dontronics-shop.com/product.php?productid=16699

CBFalconer wrote:
> Tomás Ó hÉilidhe wrote:
> ... snip ...
>> Can anyone suggest a USB to RS232 adapter that does its job
>> perfectly 100% of the time under Microsoft Windows, i.e. it
>> trully behaves exactly just like any other serial port?
> 
> Impossible.  USB is not a serial port.

Hi!

He properly means that he wants to have the RS232 tunnelled through USB 
and showing itselves as a serial port in Windows.


Look at this ftdi.com based RS232<->serial converter. The VCP drivers 
installed on your PC simply tunnels your RS232 serial port through USB 
to a virtual com-port in e.g. Windows.

(This was found at the Web-shop: http://www.ftdichip.com/FTProducts.htm ):

?14.50, US232R-100 USB to RS232 Converter, 1m:
http://apple.clickandbuild.com/cnb/shop/ftdichip?op=catalogue-products-null&prodCategoryID=4&title=USB+RS232+cab
les
Quote: "...
The electronics, including the FT232RQ chip are housed in an attractive 
glossy white enclosure with blue, side-lit LED TX and RX traffic 
indicators. A matching white 1m USB cable uses gold plated USB and DB9 
connectors.

The US232R-100 evaluation cable is supplied in retail packaging which 
includes instructions together with a Drivers and Utilities CD complete 
with Microsoft WHQL certified VCP drivers for Windows XP. Drivers for 
the Apple Mac, Linux and other versions of Windows are also included on 
the CD.
...."

Cables: UC232R:
http://apple.clickandbuild.com/cnb/shop/ftdichip?op=catalogue-products-null&prodCategoryID=45&title=UC232R

Cables: TTL-232R and variants:
http://apple.clickandbuild.com/cnb/shop/ftdichip?op=catalogue-products-null&prodCategoryID=47&title=Cables%3A+TT
L-232R+and+variants

-

The FT232BM RS232<->USB chips drivers for many platforms is found here:

Virtual COM Port Drivers:
http://www.ftdichip.com/Drivers/VCP.htm
http://www.ftdichip.com/

-

Glenn

CBFalconer wrote:
> Tomás Ó hÉilidhe wrote:
>
> ... snip ...
>
>> Can anyone suggest a USB to RS232 adapter that does its job
>> perfectly 100% of the time under Microsoft Windows, i.e. it
>> trully behaves exactly just like any other serial port?
> 
> Impossible.  USB is not a serial port.

I'm hearing some objections to my statement above.  My point is
that USB is a shared system, and that it queues up traffic for
transmission at intervals.  You can't use the adaptor to respond to
an input event in microseconds, as you can with the original port. 
What you can do is asynchronous transmission and reception, which
is most people's objective.

For example I believe that the original X-modem protocol will fail
miserably.  That requires responding to a transmission with an ACK
(or NAK) within a very short time.  Z-modem will probably work.

-- 
 [mail]: Chuck F (cbfalconer at maineline dot net) 
 [page]: <http://cbfalconer.home.att.net>;
            Try the download section.

** Posted from http://www.teranews.com **

"Tomás Ó hÉilidhe" <t...@lavabit.com> wrote in message 
news:9...@34g2000hsf.googlegroups.com...
>
> I've purchased one already made by "Cypress Semiconductor" but it
> doesn't work. The VID is 04b4 and the PID is 5500.
>
> Can anyone suggest a USB to RS232 adapter that does its job perfectly
> 100% of the time under Microsoft Windows, i.e. it trully behaves
> exactly just like any other serial port?


I've found those with PROLIFIC chip sets work well with my obscure hardware.
Controlling rts/cts/dsr/dtr correctly is always seems to be the issue....... 

"CBFalconer" <c...@yahoo.com> wrote in message
news:4...@yahoo.com...
> I'm hearing some objections to my statement above.  My point is
> that USB is a shared system, and that it queues up traffic for
> transmission at intervals.  You can't use the adaptor to respond to
> an input event in microseconds, as you can with the original port.
> What you can do is asynchronous transmission and reception, which
> is most people's objective.
>
> For example I believe that the original X-modem protocol will fail
> miserably.  That requires responding to a transmission with an ACK
> (or NAK) within a very short time.  Z-modem will probably work.

I use X-modem regularly over an FTDI chip and it has never failed.

Meindert

Meindert Sprang wrote:
> "CBFalconer" <c...@yahoo.com> wrote in message
> news:4...@yahoo.com...
>> I'm hearing some objections to my statement above.  My point is
>> that USB is a shared system, and that it queues up traffic for
>> transmission at intervals.  You can't use the adaptor to respond to
>> an input event in microseconds, as you can with the original port.
>> What you can do is asynchronous transmission and reception, which
>> is most people's objective.
>>
>> For example I believe that the original X-modem protocol will fail
>> miserably.  That requires responding to a transmission with an ACK
>> (or NAK) within a very short time.  Z-modem will probably work.
> 
> I use X-modem regularly over an FTDI chip and it has never failed.
> 

It will depend on the level of sharing.  If you have an FTDI device 
plugged directly into a root port on your PC, then it will get the full 
12 Mbs for full speed USB.  Latency will then normally be of the order 
of a millisecond or two, since that's the polling rate of USB (at least, 
for 12 Mbs USB - I don't know if it is faster for 480 Mbs USB).

If you share the same root port via a USB hub which is also used for a 
USB memory stick and transfer large files at the same time, you'll see 
far more latency and throughput issues as the bandwidth is shared.  How 
much that may affect the serial protocol used depends entirely on its 
timing requirements.

Even at best, with a direct connection to a root port, USB works with 
timing in the range of a few milliseconds.  For most uses, it works fine 
- but as Chuck says it is not going to be 100% identical to a direct 
serial link.