Monarch Instrument F2A1X - Manual (Page 8)

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3.0 USER PROGRAMMABLE HARDWARE
SETTINGS
There are several settings relating to the sensor input that can be set by the
user.
The settings are done by moving jumpers on the circuit board inside the
housing. To access these jumpers REMOVE ALL WIRING FROM THE
UNIT. Then remove the two screws on the bottom of the unit and remove the
base exposing the circuit board as shown below.
Figure 3 Signal Source Connection Detail
Figure 4 Exposed Circuit Board showing Program Jumpers
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There are three jumpers as shown in Figure 4. These are:
3.1 Sensor Power Voltage
This jumper adjusts the supply voltage to the external sensor. Can be
set as +5Vdc or +10Vdc depending on the sensor used. Factory Default
is +5V.
3.2 Sensor Termination
This jumper sets the input termination. Can be set HI for 10k pull up
resistor (to sensor supply voltage) for NPN type open collector sensors
(factory default) or LO for 10k pull down resistor (to Common) for
PNP type open collector sensors or none (remove jumper altogether)
high impedance input for external termination.
3.3 Input Coupling
This jumper sets the input coupling for the external signal. Can be set to
DC (default) for most digital input sources or AC for sine wave and
bidirectional sources or sensors that provide negative going pulses.
Once the jumpers have been set, replace the base and the two screws.