RS232 addressing

[pmciprian]

Hello,

I would like to know if anyone could get me started on a project for designing a circuit that will check the first byte sent over RS232 and if it matches a set of dip switches, it will passthrough the rest of the RS232 signal to another controller, otherwise it will passthrough nothing. Any advice would be greatly appreciated.

Thanks
Phil

 

[sid2286]

Are your dip switches connected to certain port?
1.read the port status first.
2. Check the incomming byte from RS-232

using if condition or a while
eg

if(port_status==Incomming_byte)
{
pass to other controller;
}
else
{
do nothing;
}

 

[OLIVE2222]

Hi,

As RS232 is not intended to be chained you need to work on hardware side too.

here under a link to such an application:

http://www.weedtech.com/an100.pdf

having a µC with 2 UARTS (like the ATMEGA644P) will also be a solution

cheers,
Olivier