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PICList Thread
'[EE]:USB to Serial converter'
2004\11\22@130432 by Charles Rogers

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Piclist:
 
Have had to resort to temporarily using a HP zv5160 laptop,
but it has no serial port for connecting my PS+.   Is the
solution simply to fabricate a cable, like installing a DB-9
connector on to a USB cable or is it more complicated
than that?
Have Googled extensively and found http://www.dontronics.com/usb_232.html
and http://www.ftdichip.com and what I have found is
somewhat mind boggling (at least to me). Radio Shack
has these things for $40USD.
I would really like to work this out myself, if possible,
so if someone could start me in  the right direction,
it would be most appreciated.

Charlie R.

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2004\11\22@131736 by olin_piclist

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Charles Rogers wrote:
> Have had to resort to temporarily using a HP zv5160 laptop,
> but it has no serial port for connecting my PS+.   Is the
> solution simply to fabricate a cable, like installing a DB-9
> connector on to a USB cable or is it more complicated
> than that?

It's a lot more complicated than that.  Fortunately, "USB serial ports" are
readily available.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com
____________________________________________

2004\11\22@132447 by Robert Rolf

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Charles Rogers wrote:

> Piclist:
>  
> Have had to resort to temporarily using a HP zv5160 laptop,
> but it has no serial port for connecting my PS+.   Is the
> solution simply to fabricate a cable, like installing a DB-9 connector
> on to a USB cable or is it more complicated
> than that?

Well, you will need RS232 level translators, and software
on the host side.

> Have Googled extensively and found http://www.dontronics.com/usb_232.html
> and http://www.ftdichip.com and what I have found is
> somewhat mind boggling (at least to me). Radio Shack
> has these things for $40USD.
> I would really like to work this out myself, if possible,
> so if someone could start me in  the right direction,
> it would be most appreciated.

I doubt that you could build something with just $40 of
your time.  And wouldn't it make more sense to 'plug and use'
than waste time reinventing/debugging the wheel?

USB-RS232 donggles are available in any good computer store,
and for less than Radio Shaft's price.

Robert



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2004\11\22@135118 by Wouter van Ooijen

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> Is the
> solution simply to fabricate a cable, like installing a DB-9
> connector on to a USB cable or is it more complicated
> than that?

No. The FTDI chip (FT232BM) is an example of what can be used.

I sell USB-serial cables for $ 18.50 + $ 7.35 S/H (once per order), see
http://www.voti.nl/shop/p/K-USB-2-232.html.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


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2004\11\22@135813 by Bob Axtell

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I have used two BAFO BF-810s, same price on WWW.
These are truly awesome. I think I got mine from CyberGuys.

But Wouter ships faster from NL than most US suppliers can
to US destinations; I don't know why.

--Bob

Wouter van Ooijen wrote:

{Quote hidden}

>_____________________________________________

2004\11\22@161831 by Ken Pergola

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Bob Axtell wrote:

> I have used two BAFO BF-810s...these are truly awesome.

Hi Bob,

Tell us more if you have the time. :) I'd be interested in hearing your
comments.

What are some of the features you like about it? I saw on BAFO's site that
it supports over 1 Mbps data transfer rate.
Is that something you can confirm? That would be cool if it can -- I don't
remember seeing very many USB to serial converters on the market that claim
this (other than FTDI's FT232BM chip).

On the BAFO BF-810, what is the highest baud rate you can select for the
virtual COM port?

Thanks Bob! I appreciate your time.


Best regards,

Ken Pergola



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2004\11\22@164513 by Shawn Yates

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I too have been using the BF-810 for quite some time.  The only problem
I have had is that they do not emulate the control lines vey well.  But
for data throughput, they are great.  

I have found them for 15 at tiger direct.  Anyone got a better price?

Tiger Direct page for BF-810:
www.tigerdirect.com/applications/searchtools/item-Details.asp?Edp
No=166842&sku=B133-1014

Shawn

{Original Message removed}

2004\11\22@170358 by Brent Brown

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I have used the Bafo BF-810 too, with good success. They are cheap from
local wholesaler. I have used mine with a Microchip ICD1, Shane Tolmies
bootloader and various of my own PIC projects and they work well. I re-sell
them to several of my clients and they like them too.

I've only had one occasion when a customer reported that they just didn't
work for him. In that case I expect it may have been due to delay times
caused by pacing of serial bytes into USB packets, and overly tight timing
constraints in the serial protocol. Didn't persist to figure out exactly why, but
in that case we went for serial to Ethernet conversion using the Lantronix
XPort, which was a more favourable solution.

My main dislike about the BF-810 is the threaded locking nuts jutting out on
the D9 connector. The assumption, I guess, is that the user will always
connect the device to a serial cable which has mating screws. Problem
occurs when I want to plug it in directly to an RS232 device that also has
locking nuts, therefore it wont plug in. On my own BF-810 I removed the
nuts, but they are riveted not screw in so I had to break them off and then
solder the D9 shell to hold it back in place.

I found the same problem on another brand of USB to serial converter
yesterday, so it's not exclusive to Bafo.

Some USB to serial converters (like the Bafo one) have a USB 'B' type
socket and a USB cable, others have a directly connected cable which I
prefer because that means less joins to fall apart (no locking mechanisim on
USB connectors).

--
Brent Brown, Electronic Design Solutions
16 English Street, Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  spam_OUTbrent.brownTakeThisOuTspamclear.net.nz


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2004\11\22@184130 by Mike Singer

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Charles Rogers  wrote:
> Have had to resort to temporarily using a HP zv5160 laptop,
> but it has no serial port for connecting my PS+.   Is the
> solution simply to fabricate a cable, like installing a DB-9
> connector on to a USB cable or is it more complicated
> than that?
.
> I would really like to work this out myself, if possible,
> so if someone could start me in  the right direction,
> it would be most appreciated.

Perhaps AN956 "Migrating Applications to USB from RS-232 UART with
Minimal Impact on PC Software" would be of some help.

Mike.
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2004\11\22@190353 by William Chops Westfield

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On Nov 22, 2004, at 1:45 PM, Shawn Yates wrote:

>
> I too have been using the BF-810 for quite some time.  The only problem
> I have had is that they do not emulate the control lines vey well.  But
> for data throughput, they are great.
>
Do they handle the rs232 BREAK condition?

BillW

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2004\11\22@222355 by Bob Axtell

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Ken Pergola wrote:

>Bob Axtell wrote:
>
>  
>
>>I have used two BAFO BF-810s...these are truly awesome.
>>    
>>
>
>Hi Bob,
>
>Tell us more if you have the time. :) I'd be interested in hearing your
>comments.
>
>What are some of the features you like about it? I saw on BAFO's site that
>it supports over 1 Mbps data transfer rate.
>  
>
I'm using the BF810s with MCU.CZ ICD2 clones as a replacement for USB.
That speeds up the transfer so
the ICD2 is much faster than the normal serial business; it shouldn't
be, but it is. I suspect that the data transfer
itself is instantaneous, then the serial UART chunks each byte out on
the ICD2 side...no waiting

>Is that something you can confirm? That would be cool if it can -- I don't
>remember seeing very many USB to serial converters on the market that claim
>this (other than FTDI's FT232BM chip).
>  
>
I can't tell how fast it is. Its just FAST.

>On the BAFO BF-810, what is the highest baud rate you can select for the
>virtual COM port?
>  
>
I think I can select 115.2Kb via Win2K control panel, but I use 57600
for the ICD2 clone.

--Bob

>Thanks Bob! I appreciate your time.
>
>
>Best regards,
>
>Ken Pergola
>
>
>
>_____________________________________________

2004\11\22@230325 by Ken Pergola

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Hi Bob Axtell,

Ok thanks for the feedback and your experience with this particular model.
The next time I'm in the market for one of these I'll contact BAFO just to
verify their 1 mbps claim. The reason I asked for more details is because my
SIIG Quartet PCI add-in card serial ports are specified at 921,600 bps
maximum (although I'm a bit disappointed that the SIIG engineers chose a
standard Lucky Gold Star GD75232D transceiver chips for it which, if I have
correct information, do not even come close to "officially" supporting that
baud rate). I just want to make sure that if I do get a new USB to serial
adapter that it can match that. A few years ago, I had a old Entrega USB to
serial adapter that maxed out at 115,200 bps or 230,400 bps if I remember
correctly. Things of course have improved considerable with some USB to
serial adapters since then.

Thanks again for your time and sharing your experience with this model.
Thank you also to Brent and Shawn too. :)

Best regards,

Ken Pergola




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