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Chapter 3
Hardware Overview
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CLKIN
—Clock Input. This connector supplies the module with a clock that can be
programmatically routed to the PXI backplane (PXI_CLK10_IN) for distribution to the
other modules in the chassis when the NI PXI-6683 is installed in the system timing slot.
Note
The NI PXI-6683H does not have the CLKIN connector.
•
PFI<0..2>
—Programmable Function Interface <0..2>. These connectors can be used for
either input or output. You can program the behavior of these PFI connections individually.
Additionally, PFI0 can function as an input for IRIG-B DC or AM.
Caution
Do not connect an AM signal to PFI0 when the PFI line is configured for
digital operations. This could cause damage to the digital circuitry, the device driving
the AM signal, or both. Always ensure the line is configured for IRIG-B AM
operation before connecting an IRIG-B AM signal.
•
RJ-45 Ethernet
—10/100/1000 Mbit Ethernet connection. This connector allows the
module to communicate via standard Ethernet cabling.
Caution
Connections that exceed any of the maximum ratings of input or output
signals on the NI PXI-6683 Series can damage the module, the computer, or other
devices connected to the NI PXI-6683 Series. NI is
not
liable for any damage
resulting from such signal connections.
Hardware Features
The NI PXI-6683 Series performs the following functions:
•
Synchronization using GPS, IRIG-B, PPS, or IEEE 1588.
•
Generation of future time events and clock signals, based on the synchronized time.
•
Timestamping incoming signals with the synchronized time.
•
Routing internally or externally generated signals from one location to another.
•
Single-board clock disciplining capability.