Measurement-computing USB-2416 Manual de usuario Pagina 19
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USB-2416 User's Guide Functional Details
19
Figure 15. Location of JP1
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 16. Digital I/O external resistor configuration
Counter input terminals (CTR0, CTR1)
Two 32-bit event counters are built into the USB-2416. Each counter accepts frequency inputs up to 1 MHz.
Refer to the Screw terminal pinout diagrams starting on page 10 for the location of these pins. The internal
counter increments when the TTL levels transition from low to high. The counter can count frequencies of up to
1 MHz.
- User's Guide 1
- HM USB-2416 2
- Table of Contents 3
- Chapter 5 4
- About this User's Guide 5
- Introducing the USB-2416 6
- Installing the USB-2416 7
- Installing the software 8
- Installing the hardware 8
- Configuring the hardware 9
- Functional Details 12
- Screw terminal wiring 13
- Analog/TC input terminals 13
- Analog input mode 14
- Thermocouple inputs 14
- Input isolation 16
- Digital I/O 17
- Figure 15. Location of JP1 19
- USB-2416 mechanical drawings 20
- Calibrating the USB-2416 21
- Specifications 22
- Channel configurations 23
- Accuracy 23
- Input bandwidth 34
- Noise performance 34
- Channel switching error 35
- Throughput rate 36
- Analog input calibration 37
- Digital input/output 37
- Counter 38
- Microcontroller 38
- USB specifications 39
- Environmental 39
- Mechanical 40
- Screw terminal pinout 41
- Declaration of Conformity 48
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