I had to run a sketch (BareMinimum) on the Arduino to enable me to open the serial monitor. I put into the Send box, $, then $ $ - nothing happened. Connection is fine using the UGS (GUI ), so ...

This signals to the controller to send the string to the Arduino IDE Serial Monitor. Upon delivery of the message to the Serial Monitor, the value 0 is placed in OREG, the value 64 (the address of ...