NI PXIe-2746 Quad 4×1 Multiplexer (Quad SP4T) Topology

NI Switches Help

Edition Date: April 2015

Part Number: 375472H-01

»View Product Info

Download Help (Windows Only)

The following figure represents the NI PXIe-2746 (NI 2746) in the 4×1 multiplexer topology.

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 the 4×1 multiplexer is always connected to a 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 from COM upon initial connection.

The following sequence of tasks illustrates the VI/function calls necessary to make consecutive connections—one between CH1 and COM and the other between CH2 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.