Serial Communications problem - Resolved

[VisBeg]

Dear All,

I am trying to transmit and receive a single file over a serial port using MSComm. I have a bootload cable between COM1 and COM2, and two seperate programs, (one to transmit and the other to receive the file).

I am able to happily transmit and receive text files and bitmap files of any size. Unfortunately when I attempt to send any other file types (*.dll, *.exe, *.jpg), both programs lock up. The problem is caused by the receiving com port. During file transfer, I ack and nack file receipt. However, when transmitting the above file types, the receiving com port becomes unable to transmit any data to acknoweldge the receipt of the file, and thus they both lock up.

I have no idea why this is happening, and would appreciate any answers which may shed some light on the situation.

Cheers!

[VisBeg]

Found the problem.

In case anyone was wondering, it was because the code I was re-using,(from my older version), was utilising XOn\XOff. This was preventing the "ack" being sent back to the transmitter. Removal of the protocol lines, allows the programs to run perfectly

[yaswanth]

Hi!
I guess I'm facing a similar problem with flow control. It would be very helpful to me if you can elaborate on the flow control and how to set it and stuff....pls help me out, its urgent...

Yaswanth