© National Instruments | 1-37
cDAQ-9185/9189 User Manual
• Flexible Counter/Timers—The cDAQ chassis includes four general-purpose 32-bit
counter/timers that can be used to count edges, measure pulse-widths, measure periods and
frequencies, and perform position measurements (encoding). In addition, the
counter/timers can generate pulses, pulse trains, and square waves with adjustable
frequencies. You can access the counter inputs and outputs using parallel digital I/O
modules installed in up to two slots, or by using the two chassis PFI terminals provided on
the cDAQ chassis. Refer to Chapter 6, Counters, for more information.
Ethernet Network Interface
The Ethernet Network Interface transfers analog input, analog output, and digital I/O data
between the STC3 and the network. It gathers the data into TCP/IP packets that can be sent
across the network and interpreted by the host.
Internal Ethernet Switch and Ethernet Ports
The Ethernet switch exposes two Ethernet ports to the user. Either port can be used to connect
the chassis to the network. The two ports can be used to connect multiple chassis in a daisy-chain
topology. The switch also provides synchronization features that enable analog input, analog
output, and counter/timers to be synchronized to other chassis across a distributed network.
Refer to Chapter 2, Networking, for information about cDAQ chassis daisy-chain topology and
the internal Ethernet switch.
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