INFICON MDC-370 Thin Film Deposition Controller - Manual (Page 69)

MDC-370 DEPOSITION CONTROLLER
Individual - Individual position feedback. This feedback type uses one input
for each crystal position in the sensor head. All inputs are normally false
(open circuit) unless that crystal is in position then that input is true (closed to
ground). For example, a six crystal sensor head would use six inputs. If
crystal two was in position then all the inputs would be false except the input
connected to feedback position number two.
BCD - Binary Coded Decimal position feedback. This feedback type
uses binary coding to indicate which crystal is in position. Inputs are
numbered most significant bit first. For example, an eight crystal sensor head
would use three inputs. With crystal one in position, all inputs would be false.
With crystal four in position, inputs one and two would be true and input three
would be false.
PROGRAMMING AND CONTROLLER SETUP 4-37