Measurement-computing USB-1608GX-2AO-OEM Manual de usuario descargar pdf (Pagina 15)

USB-1608GX-2AO-OEM User's Guide Functional Details

For more information about digital signal connections

For general information about digital signal connections and digital I/O techniques, refer to the Guide to Signal

Connections (available on our web site at www.mccdaq.com/signals/signals.pdf).

Trigger input

The TRIG terminal is an external digital trigger input. The trigger mode is software selectable for edge or level

sensitive.

 Edge sensitive mode is configurable for rising or falling edge.

 Level sensitive mode is configurable for high or low level.

The default setting at power up is edge sensitive, rising edge.

Retrigger mode

Retrigger mode lets you set up repetitive analog input or output trigger events. The trigger is automatically re-

armed after it is activated. Use software to set the A/D or D/A trigger count (the number of samples you want

per trigger).

Counter input

The CTR0 and CTR1 terminals are 32-bit event counters that can accept frequency inputs up to 20 MHz. The

internal counter increments when the TTL levels transition from low to high.

Timer output

The TMR terminal is a pulse width modulation (PWM) timer output that can generate a pulse output with a

programmable frequency in the range of 0.0149 Hz to 32 MHz. The timer output parameters are software

selectable. Figure 8 shows the timer output schematic.

Figure 8. Timer output schematic

Power output

The +5V terminal can output up to 10 mA maximum. You can use this terminal to supply power to external

devices or circuitry.

Caution! The +5V terminal is an output. Do not connect to an external power supply or you may damage the

device and possibly the computer.

Ground

The analog ground (AGND) terminals provide a common ground for all analog channels.

The digital ground (

GND) terminals provide a common ground for the digital, counter, timer, and clock

channels and the power terminal.

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