NI SCXI-1194/1195 Quad 4×1 Multiplexer Topology

The following figure represents the NI SCXI-1194/1195 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 operate 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.

Note  For an initial connection, you do not need to disconnect the default channel (ch0) from COM after the module has been reset or a call to the niSwitch Disconnect All Channels VI or the niSwitch_DisconnectAll function has been made.

When scanning the NI SCXI-1194/1195, a typical scan list entry could be ch1A->comA;. This entry routes the signal from ch1A to comA.