Counter Input - Measurement Computing USB-1808X User Manual

USB-1808X User's Guide
4. Hold both the top and bottom sections together, turn the device over and rest it on the surface, then
carefully remove the top section of the case to expose the circuit board.
Figure 6 shows the location of the
5. Configure the
DIO
6. Replace the top section of the housing and fasten it to the bottom section with the four screws.
For more information about digital signal connections
For general information about digital signal connections and digital I/O techniques, refer to the Guide to DAQ
Signal Connections (available for download at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).

Counter input

Counter inputs can be read asynchronously under program control, or synchronously as part of a digital scan
group.
The and
CTR0 CTR1
50 MHz.
The USB-1808X supports the following counter input modes:
Totalize

Period measurement

Pulse-width measurement

Counter input modes are programmable with software. Each mode supports additional counter operation
options.
jumper on the circuit board.
DIO
Figure 6. Pull-up/down jumper location
jumper for pull-up or pull-down, as shown in Figure 7.
Figure 7. Pull-up/down jumper configuration
terminals are 32-bit general-purpose counters that can accept frequency inputs up to
12
Functional Details