Why not convert RS232 to RS485 and connect the four devices to the same net
----- Original Message -----
From: Juan Jimenez <Juan_Jimenez_at_MXGD-TNM@CCGATE.DL.NEC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, May 03, 1999 11:10 AM
Subject: Re[2]: PIC12C508


>      Why not use the parallel port of the PC to switch the system. You get
>      256 posible options (multiplex) or 8 direct posibles.
>
>      Juan Jimenez
>
>
>
> My long goal is to built a serial interface board that include a pic, one
> RS232 line to communicate with the PC and four RS232 to communicate to the
> target system ( 4 units).  The pic's job will be to direct communication
to
> unit 1 when it sees the command "UNIT1" and to unit 2 when it sees the
> command "UNIT2" and so fort.
>
> At 09:37 AM 5/3/99 +0530, you wrote:
> >Why do you need a PIC for this ? Just connect the TX and RX line together
and
> >you receive the same bytes that are transmitted ;-)
> >
> >Pailoor
> >
> >Aidi Moubhij wrote:
> >
> >> Hi,
> >> I'm looking for code that will allow the 12C508 to receive data
serially
> >> from the PC.  The 12C508 will store 5 bytes in the buffer after that
the
> >> 12C508 will transmit the 5 bytes out back to the PC, then repeat the
task
> >> again.
> >> Does anybody have code that do this.  Thanks.
> >> Aidi Moubhij
> >>
> >> aidi@mjr.com
> >
> >--
> >=================================================
> >For Embedded Controls Solutions and Custom Designs
> >
> >CHIP TECHNOLOGIES - Member, Microchip Consultant Program
> >Bangalore - INDIA
> >
> >Email   : chiptech@vsnl.com
> >Webpage : http://business.vsnl.com/chiptech ( updated 16th April 1999 )
> >
> Aidi Moubhij
>
> aidi@mjr.com