Two different serial communication at the same time.

restman · Guest

Hi.

How can i do two serial communication at the same time by using PIC. Can i use USART module for two different serial communication.

Thanks for your help.

Matro · Guest

The simplest way is to use a PIC that has 2 UARTs.

Actually it depends on what kind of UART. If one of them shall just send data (only TX), you can think about implementing it in software.

Difficult to say more without any extra information about your project.

Matro

treitmey · Joined: 23 Jan 2004 Posts: 1094 Location: Appleton,WI USA

If I were you I'd find a PIC with 2 hardware USARTS.
Then you could fill the buffers and the IRQ could trickle out the data
at the right rate.

Guest · Posted: Tue Apr 29, 2008 7:59 am

Hmm. that's one solution thanks.

In my project, i need min 5m distance for one communication, min 80m for the other communication. We use 18f4620 for our latest project and we want to develop it by adding two serial communications.

Is there any other solution along this solution?

Matro · Guest

You will never achieve a 80m communication with RS-232.
Maybe with RS-485. So you will need an external driver.

Matro.

RLScott · Joined: 10 Jul 2007 Posts: 465

restman · Guest

Hmm. We've searched for it and we found that we could use sn75176 for it. But i don't know how to use it exactly. I found and read its datasheet but couldn't find an example code for PIC. If i can find i think we can use two sn75176 for two different communications.

restman · Guest

Matro · Guest

restman · Guest

Ok. I understood. Now, it can be only used one sn75176 per PIC(with one USART), did i understand correctly?

Is there another driver solutions that can be used without SFR?

Matro · Guest

You have to use one SN75176 by channel, i.e. one for RX and one for TX. Of course if you only need RX or TX, you can use only one.

But I definitely don't see what SFR do here !!??

Matro.

Humberto · Posted: Tue Apr 29, 2008 9:28 am