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Chapter 2
DAQ System Overview
Analog Input
Analog Output
Counters
PFI/Static DI
PFI/Static DO
DAQ-STC2
NI 6238/6239 User Manual
A
Isolation
Barrier
AI GND
A
A
AO GND
Digital
Isolators
P0
P0.GND
P1
P1.GND
Figure 2-2. General NI 6238/6239 Block Diagram
The DAQ-STC2 implements a high-performance digital engine for
NI 6238/6239 data acquisition hardware. Some key features of this engine
include the following:
•
Flexible AI and AO sample and convert timing
•
Many triggering modes
•
Independent AI and AO FIFOs
•
Generation and routing of RTSI signals for multi-device
synchronization
•
Generation and routing of internal and external timing signals
•
Two flexible 32-bit counter/timer modules with hardware gating
•
Static DIO signals
•
PLL for clock synchronization
•
PCI/PXI interface
•
Independent scatter-gather DMA controllers for all acquisition and
generation functions
Digital
Routing
and Clock
Generation
RTSI
2-2
Bus
Bus
Interface
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