USB-1208HS User's Guide
Functional Details
14
Figure 10. Pull-down and pull-up configurations
6.
Replace the top section of the case, and then fasten it to the bottom section with the four screws.
For more information on digital signal connections
For general information regarding digital signal connections and digital I/O techniques, refer to the
Guide to
Signal Connections
(available on our web site atCounter input
CTR0
and
CTR1
provide connections to each 32-bit counter input channel. Each counter can count frequencies
of up to 20 MHz.
Timer output
Use the
TMR
terminal to connect to the pulse width modulation (PWM) timer output. You can set the following
timer output parameters through software:
pulse frequency
duty cycle (pulse width divided by the pulse period)
number of pulses to generate
time delay before starting the timer output after it's enabled
resting state of the output (
idle high
or
idle low
)
The timer can generate a pulse output with a programmable frequency range of 0.00931 Hz up to 20 MHz. Both
the period and time delay ranges are 50 ns to 107.4 seconds.
Figure 11. PWM timer output channel
Trigger input
The
TRIG
connection is an external digital trigger input. The trigger mode is software selectable for:
Level-sensitive or edge-sensitive
Rising or falling edge
High or low level
The default setting at power up is edge sensitive, rising edge.
