The master / slave function allows for communication between a master unit and up to 5 additional slave units.  The master unit controls the slaves so that all 6 units run in exactly the same way.

The slaves relays information back to the master. Any error that might arise in a slave unit will be displayed on the master unit with an error message and specification of the defective unit. Therfore, all units must be numbered.

This particular master / slave function requires an extra small circuit board for each unit. This small circuit board must be mounted on the existing main circuit board of each unit.