NI SCXI-1193 Quad 4×1 Terminated Multiplexer Topology

The following figure represents the NI SCXI-1193 quad 4×1 terminated multiplexer topology.

The following figure shows the reset position of the NI SCXI-1193 in the quad 4×1 terminated multiplexer topology.

Making a Connection

For proper termination, connect an external terminator, such as the NI 50 Ω MCX terminator (778831-01), to every odd channel. Any input connected to an even channel not connected to the COM is automatically routed to its associated termination channel.

The NI SCXI-1193 in this topology contains four banks of four input channels connected to a common channel. These input channels are the even channels from channel 0 to channel 30. The four common channels are referred to as com<0..3>. You can only connect to the common channel that is in the same bank. The banks are organized as follows:

Input Channels	Common Channel
ch0, ch2, ch4, ch6	com0
ch8, ch10, ch12, ch14	com1
ch16, ch18, ch20, ch22	com2
ch24, ch26, ch28, ch30	com3

For example, you can connect ch8 to com1; however, you cannot connect ch8 to com0 in this topology.

You can connect the channels of the NI SCXI-1193 using the niSwitch Connect Channels VI or the niSwitch_Connect function. For example, to connect channel 16 to common 2, call the niSwitch Connect Channels VI or the niSwitch_Connect function with the channel 1 parameter set to ch16 and the channel 2 parameter set to com2.

When scanning the NI SCXI-1193, a typical scan list entry could be ch2->com0;. This entry disconnects ch2 from its termination and routes it to com0.