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