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© National Instruments Corporation 11 NI cDAQ-9172 User Guide and Specifications
wiring connections directly from the C Series I/O modules to your
sensors/actuators. In most cases, the C Series I/O modules provide isolation
from channel-to-earth ground.
For more information about which C Series I/O modules are compatible
with the NI cDAQ-9172 chassis, refer to the KnowledgeBase document,
C Series Modules Supported in the NI cDAQ-9172. To access this
KnowledgeBase, go to
ni.com/info and enter the info code rdcdaq.
Correlated vs. Static DIO Modules
Digital I/O module capabilities are determined by the type of digital signals
that the module is capable of measuring or generating. Static Digital I/O
modules are designed for signals that change slowly and are accessed
by software-timed reads and writes. Correlated Digital I/O modules are
for signals that change rapidly and are updated by either software or
hardware-timed reads and writes. Correlated Digital I/O modules can
perform the following tasks:
• Used in any slot—software-timed reads and writes.
• Used in slots 1 though 4—Digital Waveform Generation and
Acquisition (Correlated Input/Output)
• Used in slots 5 and 6—Counter/Timer
• Used in slots 5 and 6—Access PFI signals
To determine the capability of digital I/O modules supported by the
NI cDAQ-9172 chassis, refer to the KnowledgeBase document, CSeries
Modules Supported in the NI cDAQ-9172. To access this KnowledgeBase
document, go to
ni.com/info and enter the info code rdcdaq.
cDAQ Module Interface
The cDAQ Module Interface manages data transfers between the
USB-STC2 and the C Series I/O modules. The interface also handles
autodetection, signal routing, and synchronization.
USB-STC2
The USB-STC2 features independent High-Speed data streams; flexible
AI and AO sample timing; triggering; PFI signals for multi-device
synchronization; flexible counter/timers with hardware gating; digital
waveform acquisition and generation; and static DIO.
AI and AO Sample Timing
The USB-STC2 contains advanced analog input and analog output timing
engines. A wide range of timing and synchronization signals are available