Multiple device connected by RS232

rikotech8 · Joined: 10 Dec 2011 Posts: 376 Location: Sofiq,Bulgariq

Hi!
I want to ask, is it possible to be established communication between several
controllers via RS232. If so, how the transmiter address (point) the data to certain controller?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Google for this:

temtronic · Posted: Mon Oct 08, 2012 12:47 pm

While it is possible to setup a network using RS-232(mine's been online for about 32 years...), nowadays as Ttelmah points out RS-485 is the current choice to use.
hth
jay

John P · Joined: 17 Sep 2003 Posts: 331

I'm not sure whether the lack of clarity here is a result of your language or if there are basic things you don't know.

You can't have more than one RS-232 transmitter on a single line (though you can have multiple receivers). But often people say "RS-232" when they mean "serial port" or "UART" and maybe you're doing that.

How far apart are your "several controllers", what is the environment like and what is the data rate? You might or might not need RS-485.

n-squared · Joined: 03 Oct 2006 Posts: 99

I have implemented small networks using RS232 over the years.
What you do is connect TX of controller #1 to RX of controller #2, TX of #2 to RX of #3 .. TX of #n to RX of #1, so you have a ring topology.
Of course you have to echo a received message so the other controllers will also "see" it, and you have to make sure to stop transmission when the originally transmitting controller gets its own echo.
Do this if you have no other choice in the matter.
A better course of action is to use RS485, like the pros suggested.

BR
NN
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