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Re: synchronous interface card suggestions


On Mon, Jun 16, 2003 at 08:56:47AM -0400, John Ackermann N8UR wrote:

> I'm working with what the radios support -- which is synchronous RS-422. 
> These are some surplus radios that  have quite a bit more range than 
> 802.11b (though they're not nearly as fast).  They are 5 watt output, full 
> duplex narrowband radios that were spec'd for paths of up to 30 miles.  We 
> need the range and reliability more than the speed...

I have used RS422 using a standard UART-based card that mostly just had
different line drivers from RS232. From a software point of view, these
things behave like perfectly normal serial lines. 

So I'd say you should just be able to get a simple (16550A) UART-based
RS422 card that can run in synchronous mode (if the radios really need

Then you can use Linux' standard tty driver, with PPP or SLIP on top if
you want to do IP networking.



> --On Monday, June 16, 2003 14:40:31 +0200 Jean-Francois Dive 
> <jef@linuxbe.org> wrote:
> >Do you really want serial type and sychronous ? If not, a standard wifi
> >802.11b is effective and supported by linux, but i suppose you already
> >knows that.
> >
> >On Sat, Jun 14, 2003 at 07:57:44PM -0400, John Ackermann N8UR wrote:
> >>Hi --
> >>
> >>I'm trying to implement a wireless point-to-point link  using a pair of
> >>radios that have a synchronous RS-422 interface.  The radios operate at
> >>128kbps and provide clock signals, etc.
> >>
> >>Can anyone suggest a source for such a card -- preferably inexpensive as
> >>this is a personal project -- that has Linux support?
> >>
> >>Thanks,
> >>
> >>John
> >>jra@febo.com
> >
> >-> Jean-Francois Dive
> >--> jef@linuxbe.org

E-Advies - Emile van Bergen           emile@e-advies.nl      
tel. +31 (0)70 3906153           http://www.e-advies.nl    

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