JCM Part No . 960 - 000053R _ Rev . 6 © 2007, JCM American, Corporation 6 - 2 5 Programming and Testing AD - 02™ Retrievable Bill Validator Section 6 Normal State Flow Diagram Figure 6 - 57 illustrates a normal sequence state of Command/Response information flow in an AD - 02™ Unit . Figure 6 - 57 AD - 02 Normal State Command/Response Sequence Flow Diagram