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HELP needed on RS-232 waveform

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NiCeBoY

New Member
Hello,
i need to :

Sketch the waveform of Asynchronous signal with ASCII character L with format 7, O, 1 2400bps. (The sketch should also show the symbol time.) After you finish the sketch of the waveform, sketch another waveform from the out put of RS-232 interface with the same data format as before.
I did the sketch as i attached below, can anyone check it and let me know if its good please and how i calculate and show the symbol time in both waveform please?

below is my waveform as attachment :


thanks.
 

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Diver300

Well-Known Member
Most Helpful Member
The waveforms seem correct. The idle condition is logic 1 for both voltage levels, the same as the stop bit. The start bit commences with the transition from logic 1 to logic 0, at the end of the stop bit or at the end of an idle period.

The overall period is 10 times the bit period, as you have 7 data, one parity, one start and one stop bit.
 

NiCeBoY

New Member
also can anyone help me out to find out the Coding Efficiency, Redundancy, Transmission Efficiency & System Efficiency.

And how do i show on the above sketch the symbol time.

Thanks
 

Mr RB

Well-Known Member
Darn you didnt read your own homework question. The question says 7 0 1. You got the parity wrong, i'll leave it up to you to fix 'cos i'm not doing your homework for you. :)

Also you should show the bus free state before the start bit.
 
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