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24 Installation
Configuring the internal pull-up resistor dip switches
In FEN-31, a 1.55 kΩ resistor is connected to each signal line (A+, B+, Z+) from one end
and the other end is, by default, floating. These floating ends can be connected via
DIP switches between connectors X81 and X82.
DIP switches 1, 2, and 3 connect the floating ends of the resistors. Switch 4 selects
whether the resistor ends (connected together) are further connected to 0V or VCC
(ground or supply voltage).
Note: To access the DIP switches, the FEN-31 cover has to be removed.
Note: The DIP switches are OFF by default. Turn them ON only if an encoder that
specifically needs a pull-up or pull-down resistor is used.
The configuration of the DIP switches is shown in the table below:
Encoder type
Differential push-pull
Single-ended push-pull
Open collector (sinking)
Open emitter
1
2
3
4
off
off
off
off
off
off
off
off
on
on
on
off
on
on
on
on
ON
Resistors
Notes
connected
no
Default setting
no
Default setting
yes
Resistors pull up (A+, B+, Z+)
yes
Resistors pull down (A+, B+, Z+)
OFF
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