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Author Topic: usb to lpt converter  (Read 6524 times)
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digi_micro
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« on: January 03, 2008, 11:13:40 23:13 »

i havent got lpt port on my notbook and i want to use usb to lpt converter cable for pic programming
but this cable not genarate any lpt port but its works with printer
pls help me how can i use this converter cable

this cable ic is CH-340S its brand: s-link and model:sl-25f
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kolin
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« Reply #1 on: January 03, 2008, 11:40:54 23:40 »

usb-lpt cables usually can't be used as LPT port. They only works with printers.
sorry for bad news
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gtn
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« Reply #2 on: January 04, 2008, 08:27:43 08:27 »

Unfortunatelly Kolin is correct. Simple adapter won't do the job. If your notebook has PCMCIA conncetor, then you can use PCMCIA->LPT. Bad news is that it costs about 100$. So it is better to buy a brand new Microchip USB ICD2 from ebay for about 80$. It is much better than parallel programing Smiley
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yobalzal
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« Reply #3 on: January 04, 2008, 10:06:38 10:06 »

I am facing the same problem. My notebook don't have any serial or parallel port. I even tried a bit expensive USB docking station but it did not work. I found though a USB to serial that gives me a real com port (almost every application that uses serial port works) but unfortunately could not found a bit cheaper solution for lpt.

Please don't forget to post the detail here if anyone finds (I mean make and model, and Price?)

Cheers...
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dideco
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« Reply #4 on: January 04, 2008, 01:46:47 13:46 »

Is it possible to write a code for PIC's to convert serial to parallel? There are cheap usb to serial converters on the market. By this way a serial to paralel converter may work for al paralel interface programmers.

There were some printers working both with serial and paralel interface several years ago when USB was not very popular. If such kind of conversion possible, why dont we use paralel interface problem by this way?
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digi_micro
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« Reply #5 on: January 04, 2008, 01:55:30 13:55 »

t has some useful information in this site http://www-user.tu-chemnitz.de/~heha/bastelecke/Rund%20um%20den%20PC/USB2LPT/index.html.en#driver
but my chip is different
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yobalzal
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« Reply #6 on: January 05, 2008, 08:08:31 08:08 »

A serial to parallel converter using the AT89C2051: Please have a look at this site

http://www.airborn.com.au/serial/sertopar.html

The converter runs at 9600 baud, and outputs each byte received on a centronics style parallel port, together with a nominal 50 microsecond strobe. The converter buffers up the bytes received if busy is active, and is bidirectional - when the sample switch is pushed, the converter samples the parallel port and transmits the value back out the serial port.

Complete detail including schematics and firmware is given on site. I hope this will help.
« Last Edit: April 02, 2008, 06:08:05 18:08 by yobalzal » Logged
sinisa
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« Reply #7 on: January 05, 2008, 10:52:17 10:52 »

usb to lpt converter

http://rapidshare.de/files/38213033/4439.rar.html
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« Reply #8 on: January 05, 2008, 11:56:57 11:56 »

best to a pickit2, on cost alone it wins.
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spl
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« Reply #9 on: January 08, 2008, 06:59:18 06:59 »

USB chip
 FT232  for usb to serial port
 see.. http://www.ftdichip.com/
 
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digi_micro
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« Reply #10 on: January 08, 2008, 04:09:37 16:09 »

USB chip
 FT232  for usb to serial port
 see.. http://www.ftdichip.com/
 

no serial pls read subject again correctly
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zetd
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« Reply #11 on: January 09, 2008, 11:34:42 11:34 »

no serial pls read subject again correctly

Must be FT245R from FTDI, to do that conversions, looks at FT245R datasheet and there is 8 bit bidirectional IO + 2 Input + 2 Output

more at http://www.ftdichip.com/Products/FT245R.htm


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LazBoy
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« Reply #12 on: January 15, 2008, 07:17:44 07:17 »

FT245 is USB to parallel converter, right.
But should not use LPT conversion purpose directly.
In that case chip needs some driver to perform LPT activity.

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nine9
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« Reply #13 on: January 21, 2008, 08:12:50 20:12 »

buying a new programmer seems to be more reliable and cheaper for me
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ZH
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« Reply #14 on: February 19, 2008, 10:09:20 10:09 »

t has some useful information in this site http://www-user.tu-chemnitz.de/~heha/bastelecke/Rund%20um%20den%20PC/USB2LPT/index.html.en#driver
but my chip is different
This site have AVR chip USB2LPT
But is so slowlly.
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GreenGiant
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« Reply #15 on: February 21, 2008, 07:34:52 07:34 »

If you just need it to program pic', then look into a Serial/USB based programmer.
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fios
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« Reply #16 on: March 05, 2008, 03:45:26 03:45 »

That docking station work fine for me... TRENDnet TU2-ET200.

http://trendnet.com/langpo/products/proddetail.asp?prod=195_TU2-ET200&cat=32
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seaspac
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« Reply #17 on: March 05, 2008, 12:02:20 12:02 »

Hi,

I m not an expert on microcontrollers but i see a lot of usb microcontroller from ATMEL, may be we can use them to make a real Bidirectional full functional LPT port.

Any one has intesion to work in this direction, may be i start my project on it, the problem is PC side programming of the driver as i can easily come up with a hardware design.

Thanks

seaspac
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