OM-USB-1208HS Series User's Guide
Functional Details
15
Figure 8. PWM timer output schematic
Refer to Figure 3 on page 11 for the location of the
TMR
pin.
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.
Refer to Figure 3 on page 11 for the location of the
TRIG
pin.
Retrigger
The acquisition uses the trigger settings for positive edge/negative edge and level-sensitive/edge-sensitive, but
automatically re-arms the trigger after it is activated
Power outputs
You can use the two
+5V
connections to supply power to external devices or circuitry. These terminals can
output up to 285 mA.
Caution!
The
+5V
terminals are outputs. 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 ground (
GND
) terminals provide a common ground for the digital, counter, timer, and clock channels and
the power terminals.
Refer to Figure 3 on page 11 for the location of the
AGND
and
GND
pins.
