Connecting RS422 to AVR

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aramez
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Posted by aramez: Wed. Mar 4, 2009 - 12:16 PM
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Hi all
I'd like to connect RS422 to an AVR (for example ATmega16), but I did not find anything useful. Can anyone help us?
Regards.

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AVR Microcontrollers, AVR UC3, ATmega16
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hce
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Posted by hce: Wed. Mar 4, 2009 - 12:41 PM
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Well, you forgot to tell which AVR32 device you are using, but there is really no tricks to do 422.

Setup the AVR32 device to do normal RS232 communication, with matching setup on the AVR device (baudrate, bits, stop, parity, etc). Then you'll need two RS232 TTL level => RS422 IC to get the differential signaling.

AVR32 device -- TTL RS232-RS422 ----- RS422-RS232 TTL -- AVR device

Quite simple :)

Hans-Christian

Last Edited: Wed. Mar 4, 2009 - 01:12 PM
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aramez
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Posted by aramez: Wed. Mar 4, 2009 - 01:09 PM
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thanks much.

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austca
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Posted by austca: Fri. Mar 6, 2009 - 01:44 AM
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Do you really need the RS232 level drivers? I think there are TTL RS422 drivers... have not looked today:(

Caleb

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drt80
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Posted by drt80: Fri. Mar 6, 2009 - 04:06 AM
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austca wrote:
Do you really need the RS232 level drivers? I think there are TTL RS422 drivers... have not looked today:(

Caleb

Yes, there are ICs that convert TTL-> RS422 and vice versa. You just need a USART peripheral in the chip.

-drt

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vamsi_vvk
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Posted by vamsi_vvk: Fri. Jun 25, 2010 - 11:41 AM
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Any part numbers.

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tr-avr
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Posted by tr-avr: Sat. Jun 26, 2010 - 09:22 PM
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Goto here:
http://datasheetcatalog.net

And search...

I am using this one : MAX485 for several projects

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