writing the variable value on port.

[jacek]

You are writing "i" string to the port, not the variable. If you want to write variable's value, you have to first convert it to a byte array.

You need something like:

port->write( QString::number( i ).toAscii() );

port->write( QString::number( i ).toAscii() );

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[jjbabu]

thanx for ur sharp response.i did well with ur suggession.thank u.bye