2-18
Functional Description
KPCI-3110 and KPCI-3116 User’s Manual
Trigger sources
A trigger is an event that occurs based on a specified set of conditions. KPCI-3110 and
KPCI-3116 boards support the following trigger sources for analog output operations:
•
Software trigger
•
External digital (TTL) trigger
•
Analog threshold trigger
This subsection describes these trigger sources in more detail.
Software trigger
A software trigger event occurs when you start the analog output operation (the computer issues
a write to the board to begin conversions). Specify the software trigger source in software.
External digital (TTL) trigger
For analog output operations, an external digital trigger event occurs when the KPCI-3110 or
KPCI-3116 board detects either a rising or falling edge on the External D/A TTL Trigger input
signal connected to screw terminal 75 on the STP-3110 screw terminal panel (pin 8 on connector
J2). The trigger signal is TTL-compatible.
Using software, specify the trigger source as either a rising-edge external digital trigger or
falling-edge external digital trigger.
Analog threshold trigger
For analog output operations, an analog trigger event occurs when the KPCI-3110 or KPCI-3116
board detects a transition from above a threshold level to below a threshold level (falling edge),
or a transition from below a threshold level to above a threshold level (rising edge). The follow-
ing analog threshold trigger sources are available:
•
External Analog Trigger input signal connected to screw terminal 104 on the STP-3110
screw terminal panel (pin 34 on connector J2). Using software, specify the trigger source as
either a rising-edge or falling-edge analog threshold trigger.
•
One of the analog input channels after gain is applied. Using software, specify the trigger
source as either a positive threshold trigger or a negative threshold trigger.
Using software, specify the analog input channel used as the analog threshold trigger as the first
channel in the analog input channel list; refer to
page 2-3
for more information.
On KPCI-3110 and KPCI-3116 boards, the threshold level is set using a dedicated 8-bit DAC
(the second analog output subsystem); the hysteresis is fixed at 50mV. Using software, program
the threshold level by writing a voltage value to the DAC of the second analog output subsystem;
this value can range from
−
10V to +10V.
NOTE
If you are using an analog threshold trigger to trigger both the A/D and
the D/A subsystems, ensure that you use the same analog trigger type for
both subsystems (either external or one of the analog input channels).
Summary of Contents for KPCI-3110
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Page 16: ...Preface...
Page 20: ...1 Overview...
Page 25: ...2 Functional Description...
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Page 61: ...3 Installation and Configuration...
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Page 86: ...4 Testing the Board...
Page 89: ...5 Calibration...
Page 92: ...6 Troubleshooting...
Page 99: ...A Specifications...
Page 111: ...B Connector Pin Assignments...
Page 116: ...C Systematic Problem Isolation...
Page 143: ...D Using Your Own Screw Terminal Panel...
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