PXI-2558 Overview

PXI-2558 Pinout


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Table 1. Signal Descriptions
Signal Description
COMx Routing destination for corresponding signal connections
NCx Normally closed signal connection
NOx Normally open signal connection

PXI-2558 Hardware Diagram

This figure shows the hardware diagram of the module.


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PXI-2558 Topology

Module software name: 2558/4-SPDT (NISWITCH_TOPOLOGY_2558_4_SPDT)

Quad SPDT 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 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 is always connected to each 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 (NCx) from COMx upon initial connection.

The following sequence of tasks illustrates the VI/function calls necessary to make consecutive connections—one between NO 1 and COM1 and the other between NC 1 and COM1:

  1. Call the niSwitch Connect Channels VI or the niSwitch_Connect function with parameters no1 and com1.
  2. Call the niSwitch Disconnect Channels VI or the niSwitch_Disconnect function with parameters no1 and com1.
  3. Call the niSwitch Connect Channels VI or the niSwitch_Connect function with parameters nc1 and com1.

When scanning the module, a typical scan list entry might be no1->com1;. This entry routes the signal connected to NO 1 to COM 1.