JimboZA:
But Serial.print sends from the Arduino to the monitor...
Exactly, I need the arduino to send the "s" command to start communications. Just assume I have two arduinos connected via serial. Unit A is waiting for the "s" command to come from the serial before it will start streaming data to Unit B. Unit B upon boot up will send the "s" command via serial to A to let it know that it is ready. So I do need unit B to Serial.print.
I have tested unit A through the serial monitor and it works fine.
But thank you anyway.