External Pull-Up/Pull-Down Capability - Measurement Computing USB-2416 User Manual

USB-2416 User's Guide
Figure 14. Location of screws connecting bottom and top sections of case
The pull-up/pull-down voltage is common to all of the internal 47 kΩ resistors.

External pull-up/pull-down capability

You can also place an external pull-up resistor on any of the DIO bits. This enables you to pull the DIO bit up to
a voltage that exceeds the internal +5 V pull-up voltage.
When using external pull-up resistors, note the following:
You should either remove the JP1 jumper or store it by attaching it to one of the three pins.

When using external pull-up resistors, the internal resistors cause slight impedance shifts to digital lines in

the on state as the number of lines in the off state changes.
Figure 15. Location and default configuration (pull-up) of JP1
Figure 16. Digital I/O external resistor configuration
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Functional Details