• State Not Answered
  • Locked Locked
  • Replies 25 replies
  • Subscribers 21 subscribers
  • Views 2993 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

SERIAL COMMUNICATION PROBLEM

LA p

this is my code for serial communication using 8051
iam trying to send letter B on serial port
but iam not getting any thig on heperterminal though all setting are ok .so not getting what the problem is.

 ORG 000H

     MOV  TMOD,#20H
     MOV  TH1,#0FAH

     MOV  SCON,#50H
     SETB TR1
     MOV  A,#'B'
     ACALL DELAY
A_1:
     MOV  SBUF,A
H_1: JNB  TI, H_1
     CLR  TI
     SJMP A_1
DELAY:

         MOV R0,#255
   L1:  DJNZ R0,L1
        MOV R1,#255
L2:     DJNZ R1,L2
        RET
        end

Parents
  • 0 in reply to Eric Best

    'Baud' [Bd] is a name of a unit named after Emile Baudot, 'rate' means a speed.

    Eric,

    Try using google and doing a define:baud

    Far more often than not, you'll get something along the lines of 'unit of signalling speed' and 'number of bits per second'.

    When I last got stopped by the police for speeding, they said I was doing 39MPH in a 30MPH zone, they didn't say I was doing 39MPH speed in a 30MPH speed zone.

    Change that to 'if I were to get stopped by the police' ;)

Reply
  • 0 in reply to Eric Best

    'Baud' [Bd] is a name of a unit named after Emile Baudot, 'rate' means a speed.

    Eric,

    Try using google and doing a define:baud

    Far more often than not, you'll get something along the lines of 'unit of signalling speed' and 'number of bits per second'.

    When I last got stopped by the police for speeding, they said I was doing 39MPH in a 30MPH zone, they didn't say I was doing 39MPH speed in a 30MPH speed zone.

    Change that to 'if I were to get stopped by the police' ;)

Children
  • 0 in reply to Susi Sware

    But at least the definitions claiming "number of bits per second" should be ignored since that is a very bad definition.

  • 0 in reply to Susi Sware

    I tried Google before I answered, of course. I must confess that even the 'unit named after Emile Baudot' has been pasted from Wikipedia (you may have noticed that ;-), even though I knew that fact before. On the other hand, Wikipedia (not talking about Google or Internet itself) is not fully trustworthy source...

    To Per Westermark:
    'baud rate' and 'number of bits per second' or, to be more precise, [Baud] and [bits/s] are DIFFERENT things, both meaningful. Unlike [Baud], which includes "all costs", i.e. START-bit, STOP-bit, parity bit, etc., the unit [bit/s] means only the 'useful' information (the character itself) transferred per second.

    Best regards,
    Eric

  • 0 in reply to Eric Best

    No, baud contra bits/s shouldn't consider bits including/excluding start/stop bits. It is the number of symbol transitions per second, so it might be the same as bits/s, but for example high-speed modems transfers more than one bit in each symbol by using phase and amplitude, i.e. bits/second is higher than your baud measure.

    That is why I claimed that definitions equalizing bits/s and baud are wrong.