NI SCXI-1191 Quad 4×1 Multiplexer Topology

The following figure represents the NI SCXI-1191 in the quad 4×1 multiplexer topology.

Making a Connection

In this topology, you can connect channels by calling the niSwitch Connect Channels VI or the niSwitch_Connect function.

For example, to connect ch1A to comA, call niSwitch_Connect (vi, "ch1A", "comA"). If you now want to connect ch2A to comA, first disconnect the existing connection. The sequence of calls for this task is as follows:

niSwitch_Disconnect (vi, "ch1A", "comA")

niSwitch_Connect (vi, "ch2A", "comA")

Note  niSwitch_Disconnect (vi, "ch1A", "comA") does not activate the relay until the niSwitch_Connect(vi, "ch2A", "comA") is executed. One channel of each 4×1 multiplexer is always connected to its respective common channel.