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8051 serial communication problem

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Qasim Khokhar

Qasim Khokhar

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hi, i am trying to interface serially with 8051 i am using ISIS , hyper-terminal and virtual com port emulator , i am using MAX232 for level conversion but after passing through max232 data become garbage , hyper-terminal show garbage characters . i am attaching my ISIS model and C code with my post . can anybody help me . One more thing my configurations are correct .


Untitled.pngView attachment code.txt
 

this is my working schematic and code look at it and comparison between it and your schematic and code
 

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  • control 4 relay via UART.rar
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#MAAM# said:
this is my working schematic and code look at it and comparison between it and your schematic and code
Click to expand...

MAAM its really help full Thanku shhooooo much . one thing i have to ask , i am using AT89C51 so when i connect not on TX and RX its working for bi-direction but in your schematic diagram you never connect on both terminal is 8152 do this step by its own .
THANKu again :p
 

dear Qasim please clarify your question

i am using AT89C51 so when i connect not on TX and RX its working for bi-direction but in your schematic diagram you never connect on both terminal is 8152 do this step by its own
Click to expand...

thank you
 

in your schematic diagram there is one "NOT GATE " is connected ! for bi-direction when i connect NOT GATE on both tx and rx of 8051 it work. My question is this 8052 convert data before transmit from TX.

:???:
 

Qasim Khokhar said:
in your schematic diagram there is one "NOT GATE " is connected ! for bi-direction when i connect NOT GATE on both tx and rx of 8051 it work. My question is this 8052 convert data before transmit from TX.

:???:
Click to expand...

As jayanth.devarayanadurga said but in practical experiment you not need this not gate.
 
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