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x3.exe
Joined: 08 Sep 2009
Posts: 25
Location: Bradford
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 03 Nov 2009 18:25 10M PC to microcontroller cabled connection |
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Dear all,
Does anyone know how to interface uC to PC over 10m distance, with data rates up to 1Mbitps?
looking forward to your replies.
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sebmaster
Joined: 09 Mar 2008
Posts: 11
Helped: 2
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03 Nov 2009 18:48 Re: 10M PC to microcontroller cabled connection |
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Might be a little overkill but LVDS would work.
See this for speed vs. distance: http://pdfserv.maxim-ic.com/en/an/AN1856.pdf - youd be looking at anywhere between 500-600Mbps.
You can buy really simple driver/reciever chips that would be good for serial connections.
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x3.exe
Joined: 08 Sep 2009
Posts: 25
Location: Bradford
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03 Nov 2009 19:25 Re: 10M PC to microcontroller cabled connection |
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| Forgot to mention that data is output from uC through UART. As far as I know, for RS232 cables, length of the cable should be very short in order to operate at 1Mbps. For USB, maximum cable length is 5m. However, I have read that there are some USB active extension cables, which have built-in repeaters or something. However, I am not sure whether it will provide a reliable communication link between computer and microcontroller. Does anyone have any experience in using USB extension cables with microcontrollers?
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sebmaster
Joined: 09 Mar 2008
Posts: 11
Helped: 2
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04 Nov 2009 0:09 Re: 10M PC to microcontroller cabled connection |
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Hi x3.exe,
Sorry I can't tell you much about USB repeaters, but acctually when I mentioned LVDS I was thinking of a serial connection like you mentioned.
Now I have never done this but I am *pretty sure* you could use a couple of these to 'jump' the 10m gap between your uC and your PC: http://www.national.com/mpf/DS/DS90LV019.html
I would think it would be a simple matter of providing them power then just connecting the appropirate Tx/Rx of your serial ports to the inputs/outputs and running some cheap twisted pair inbetween.
Those chips are about £2 each, so it might be a fair bit cheaper than using USB.
Good luck anyway with whatever you go with!
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ChrisC
Joined: 30 Sep 2009
Posts: 34
Helped: 8
Location: London, UK
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04 Nov 2009 13:09 10M PC to microcontroller cabled connection |
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| What about RS485? You can get RS232 to RS485 converters which will handle 1Mbit/sec (e.g. Amplicon 485HF9) which plug directly into an existing serial port, or you can get the bare RS485 transceivers (e.g. Maxim MAX3080 family) for integrating onto your own PCB.
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