Trigger Input; Counter Input - Measurement Computing USB-1608GX User Manual

USB-1608GX User's Guide
5. Configure jumper
Figure 8 shows the location of the jumper on the board.
Figure 9 shows the jumper configured for pull-up and pull-down.
6. Replace the top section of the case, and fasten it to the bottom section with the four screws. Replace the
rubber feet onto each screw.
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 on our website at www.mccdaq.com/support/DAQ-Signal-Connections.aspx.

Trigger input

The terminal is an external digital trigger input. The trigger mode is software selectable for edge or level
TRIG
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 and
CTR0 CTR1
internal counter increments when the TTL levels transition from low to high.
for either pull-up or pull-down. The jumper is configured by default for pull-down.
W1
Figure 8. W1 jumper location
Figure 9. W1 jumper configurations
terminals are 32-bit event counters that can accept frequency inputs up to 20 MHz. The
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Functional Details