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Format of the data received by MSComm from a COM Port??

Posted on 2004-09-06
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Last Modified: 2013-12-25
I am interfacing a 8 bit microcontroller based system with a PC using COM port. I am trying to send data in binary format (conforming to RS232) from the microcontroller to the PC. On the PC side I have a simple application which has to receive data and display it. Later I would enhance the application so that it can store and plot graphs using the data.

I am using MSComm control. The settings for the serial port are 9600 baud rate, no parity bit, 8 bit data and 1 stop bit.

When I am displaying the data received from the microcontroller, I am getting garbage output. I am facing problem in understanding the format in which VB receives the data. E.g. I am repeatedly sending 9 from the microcontroller but I am getting ‘I’ as output on the PC side.

Please provide me information about the format in which data is received by MSComm and how I can overcome the above problem. I feel that I am making mistake in conversion of data format and am not being able to figure it out?

Please help urgently??

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Question by:prashant_agr
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imarshad earned 375 total points
ID: 11989471
You should first monitor the coming data with Hyper Terminal......Set the following parameters .....9600 baud rate, no parity bit, 8 bit data and 1 stop bit......Now what you receive ? Is it still "I" or now you receive "9" ??? If you are still receiving "I" then there is some problem with the handshaking and/or Baud Rate.......Try to adjust the Baud rate accordingly......If you receive "9"
in the Hyper Terminal screen then you need to post your code here so that we can check what was the problem in your code......

Imran Arshad
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