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Use a pup on it, so it doesnt float.

--- L030010 <l030010@singnet.com.sg> wrote:

> i try that for TX is ok but RX cannot
> when the switch is disable the line is floating so
> the pic is reading 
> rubbish even if there is nothing on the line, the rx
> line when idle should 
> be high
> 
> i use this
> 
> 
> 
> and it is working
> 
> 4051 is a 1 to 8 4052 is a 1 to 4 am i right
> 
> please let me know if it is wrong
> 
> but this circuit is working fine for me
> 
> regards
> WebSite : http://soonlee.agreatserver.com
> ----- Original Message ----- 
> From: "Vic Fraenckel" <victorf@windreader.com>
> To: "PICMIT" <piclist@mit.edu>
> Sent: Wednesday, May 04, 2005 8:08 PM
> Subject: [EE] Multiplexing RS232
> 
> 
> >I have a need to distribute a single RS232 port
> (TXD, RXD, GND only) to one
> > of four peripherals depending on certain
> conditions. This would be to ONLY
> > one at a time. My idea is to use a 4052
> multiplexer to do this. This 
> > devioce
> > is a dual 4 port multiplexer and I would configure
> it with the TXD on one
> > port and RXD on the other and then, using the S0
> and S1 select lines, to
> > distribute the signals to the desired output. Is
> this a feasible thing to
> > do? If not, is there a better solution that is
> doable?
> >
> > Any enlightenment will be appreciated.
> >
> > TIA
> >
> > Vic
> >
>
________________________________________________________
> >
> > Victor Fraenckel - The Windman
> > victorf ATSIGN windreader DOTcom
> > KC2GUI
> >
> >
> >
> > -- 
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist 
> > -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 



		
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