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2IQEC2/43798 Manual 11
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5105
Index Control Registers (Write to Control Address)
Either the LCNTR'/LOL' or the RCNTR'/ABG inputs can be
initialized to operate as an index input. When initialized as such,
the index signal from the encoder, applied to one of these inputs
performs either the Reset CNTR or the Load CNTR or the Load OL
operation synchronously with the quadrature clocks. Note that only
one of these inputs can be selected as the Index input at a time and
hence only one type on indexing function can be performed in any
given set-up. The index function must be disabled in non-
quadrature count mode.
IDR Byte Defined
76543210
X11XXXX0DisableIndex
X11XXXX1Enable Index
X 1 1 X X X 0 X NegativeIndex Polarity
X 1 1 X X X 1 X PositiveIndex Polarity
X 1 1 X X 1 X X LCNTR'/LOL'pin is indexed
X 1 1 X X 0 X X RCNTR'/ABGpin is indexed
011XXXXXSelecttheIDRaddressed by X'/Y input
111XXXXXSelectbothXCIDRandYIDRorZIDRandWIDRtogether