PXI-2555 Overview

PXI-2555 Pinout


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Table 1. Signal Descriptions
Signal Description
CHx Signal connection with optional termination
COM Routing destination for all channels with optional termination

PXI-2555 Hardware Diagram

This figure shows the hardware diagram of the module.


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PXI-2555 Topology

This figure describes the topology of the module.

Module software name: 2555/4x1 Terminated Mux (NISWITCH_TOPOLOGY_2555_4X1_TERMINATED_MUX)

Notice The terminators on the module are rated for 1.5 W at 25 °C. When operating at ambient temperatures greater than 25 °C, a termination power derating applies. Refer the PXI-2555 Specifications for more information about termination power derating. Terminators cannot withstand the full rated power of the module.

4x1 Multiplexer


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Making a Connection

Call the niSwitch Connect Channels VI or the niSwitch_Connect function to connect channels in this topology. If applicable, you must call the niSwitch Disconnect Channels VI or the niSwitch_Disconnect function to disconnect an existing connection before you call the niSwitch Connect Channels VI or the niSwitch_Connect function.

Note All channels are disconnected from COM when the module is in its power on state. Any input channel not connected to COM is connected to its associated 75 Ω terminator.

The following sequence of tasks illustrates the VI/function calls necessary to make consecutive connections—one between CH 1 and COM and the other between CH 2 and COM:

  1. Call the niSwitch Connect Channels VI or the niSwitch_Connect function with parameters ch1 and com.
  2. Call the niSwitch Disconnect Channels VI or the niSwitch_Disconnect function with parameters ch1 and com.
  3. Call the niSwitch Connect Channels VI or the niSwitch_Connect function with parameters ch2 and com.

When scanning the module, a typical scan list entry might be ch1->com;. This entry routes the signal connected to CH 1 to COM.