8051 serial communication problem

[Qasim Khokhar]

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 .


View attachment code.txt

 

[#MAAM#]

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

 

[Qasim Khokhar]

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

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

 

[amayilsamy]

I want subscribe this thread . Thank you

 

[#MAAM#]

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

thank you

 

[Qasim Khokhar]

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.

:???:

 

[jayanth.devarayanadurga]

MAX232 o/p is inverted.

 

[#MAAM#]

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.

:???:

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

 

[patelhirenh]

Proteus software image