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To use single-ended open collector and open emitter HTL encoders, the interface unit
needs to have pull-up resistors configured.
R
For open collector HTL encoder, the OUT+ channel (A+/B+/Z+) is actively driven low
when the transistor closes the circuit. When the transistor opens the circuits, the
signal line is passively pulled high by the 1.5 kilo-ohm load resistor in FEN-31.
For open emitter HTL encoder, the OUT+ channel (A+/B+/Z+) is actively driven high
when the transistor closes the circuit. When the transistor opens the circuits, the
signal line is passively pulled low by the 1.5 kilo-ohm load resistor in FEN-31.
ENCODER
ENCODER
R
FEN-31
VCC
1.5k
A+/B+/Z+
A-/B-/Z-
0 V
FEN-31
1.5k
Installation 23
VCC
A+/B+/Z+
A-/B-/Z-
0 V
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