Changes made for Pathfinder 5226 controllers.

There was a bug in the communication between the 5226 controller and the Indra Drive CS where the controller was able to send a command before the drive was done processing the previous command. This caused the communication to get into a stalled state where the drive was sitting there waiting for a command and the controller was sitting there because it already sent the command.

The fix to this was found when looking at available status bits the drive sends back through implicit messaging. One of them was Command Value Acknowledgment which can tell the controller that it received the message. The controller was then set up to use this status to check before sending another command.