Can I send a 100 Hz message (one message sent every 10 millisecond with 100 bytes of data) in WIndows Operating System using an RS 422 serial communication card without loss of even a single byte ? I am sending a 100 Hz data with 100 bytes in Windows Operating System using a RS 422 serial communication card. I am using windows timer for sending it every 10 milliseconds. But data is lost in every cycle. I miss 5 to 10 bytes every cycle. Can anybody provide any solution in Windows for this problem ?