Labconco FreeZone and FreeZone Plus 6, 12 and 18 Liter Freeze Dry Systems 79600 Series - Manual (Page 46)

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Chapter 6: Using the RS232 Receptacle
Product Service: Domestic 1-800-522-7658, International 816-333- 8811
6. When the Freeze Dryer main power switch is on, the data will
be transmitted and updated at the time intervals selected by the
user.