PXI-2557 Overview

PXI-2557 Pinout


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

PXI-2557 Hardware Diagram

This figure shows the hardware diagram of the module.


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PXI-2557 Topology

This figure describes the topology of the module.

Module software name: 2557/8x1 Mux (NISWITCH_TOPOLOGY_2557_8X1_MUX)


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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 The niSwitch Disconnect Channels VI or the niSwitch_Disconnect function does not operate the relay until the next niSwitch Connect Channels VI or the next niSwitch_Connect function is executed. Thus, one channel of each of the 8x1 multiplexers is always connected to the common channel. If you have reset the module or called the niSwitch Disconnect All Channels VI or the niSwitch_DisconnectAll function, you do not need to disconnect the default channel (ch0) from COM upon initial connection.

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.