How to tell if a string to serial port has been sent


 
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# 1  
Old 04-12-2009
How to tell if a string to serial port has been sent

I have a need to determine when a string has been completely sent via a serial port from a standard 'C' application. The code is as follows:

SerialPort_Send = open (pPortString, O_WRONLY | O_NOCTTY | O_NONBLOCK);
write (SerialPort_Send, pCommandString, strlen (pCommandString));
close (SerialPort_Send);

Is there a way of doing this?

Thanks in advance
-ExDes-
# 2  
Old 04-12-2009
Then open the serial port in blocking mode so that it won't close until the entire string has been read by the receiving process.
# 3  
Old 04-12-2009
Have the other side send back some kind of information (eg 0xFF or some other byte of your choosing) as soon as all information has been received.
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