[Rahul]

I read it somewhere just now about it (I myself asked it in my earlier post though) and thought might help some else also:

"

One stop bit-time is recommended.

If the RS-232 cable is very long then two stop bit-times may be needed.

You may occassionally see 1.5 stop bit-times. The intent is to gain 4% more data throughput when a link is too long for one stop bit-time but is too short to require two stop bit-times. 1.5 stop bit-times is now rare enough to be a hazard to use

"

[Rahul]

Yes dear I have set the baud rate on both sides as 9600.

[Rahul]

Thanks a lot Ameer for your support but I took a very simple program as posted on the link and still couldn't get the echo back. So my concern is not developing program but troubleshooting my simple tx-rx using hyper terminal.

[Rahul]

sorry I forgot to mention that I'm using 89v51rd2fn, in case it matters.

[Rahul]

Hi Ameer,

I think you can find the necessary details on:

http://www.engineersgarage.com/microcontroller/8051projects/interface-serialport-RS232-AT89C51-circuit

 

As for the same program code mentioned on this page, can some one plz tell me how to get the CORRECT characters on the terminal. I'm receiving an absurd value in reply of any typed character (for the same program as mentioned on the link) on the terminal.

I understand that there is nothing wrong with the program but I'm not getting the sent character back. Ex. a-a-a-a-a-a-  etc when i'm typing only 'a'.

[Author]

Posts