NI SCXI-1129

The NI SCXI-1129 module has the following legacy suffixes:

• MATRIX_4x16—four 4×16, 2-wire matrixes
• MATRIX_4x32—two 4×32, 2-wire matrixes
• MATRIX_4x64—one 4×64, 2-wire matrix
• MATRIX_8x16—two 8×16, 2-wire matrixes
• MATRIX_8x32—one 8×32, 2-wire matrix
• MATRIX_16x16—one 16×16, 2-wire matrix
• MATRIX—topology is determined by the terminal block configured in MAX

For example, to configure the NI SCXI-1129 in the 4×64 topology, the resource name is:

SCXIn::m::MATRIX_4x64

where

n = chassis ID

m = module slot number

You can also use MATRIX as a resource name. If you use MATRIX, NI-SWITCH picks a topology based on the terminal block you configured in MAX.

Note  If you specify MATRIX as the resource name and do not configure a specific terminal block in MAX, then the NI SCXI-1129 defaults to the MATRIX_4x16 topology.

Any of the following resource names allows you to perform the following operations on the NI SCXI-1129:

• Route signals with the connect/disconnect functions
• Scan a list of channels
• Manually control individual switches

The analog bus relays are not automatically connected when configuring the NI SCXI-1129 in any of the above mentioned topology.

Routing Signals

Using the NI SCXI-1129, you can route signals in any one of six configurations: MATRIX_4x16, MATRIX_4x32, MATRIX_4x64, MATRIX_8x16, MATRIX_8x32, or MATRIX_16x16.

For example, calling the niSwitch Connect Channels VI or the niSwitch_Connect function with channel 1 set to B4R3 and channel 2 set to B4C3, routes signals from row 3 of bank 4 to column 3 of bank 4. Refer to Topologies for more information about matrix topologies.

Scanning a List of Channels

You can scan through a list of channels on the NI SCXI-1129 by specifying the triggering information and a scan list. The resource name does not change when scanning on the NI SCXI-1129. For example, you can use MATRIX_4x16 to route channels and scan on the NI SCXI-1129. Refer to scanning for more information on scanning options and the scan list syntax.

Analog Bus Configuration for Scanning

The analog bus channels are not automatically connected to the HVAB on the NI SCXI-1129. Connecting the analog bus channels enables a DMM that is cabled to the HVAB to take measurements. To close the analog bus channels, you can specify the analog bus as part of the scan list. For example, a scan list entry of r0->com0 && com0->ab0; connects row 0 to analog bus 0. You can also close the analog bus channels by calling the niSwitch Connect Channels VI or the niSwitch_Connect function with channel 1 set to com0 and with the channel 2 set to ab0.

Note  If the analog bus relays are closed during a scan, they remain closed until the niSwitch Abort Scan VI or the niSwitch_AbortScan function is called.

Manual Control of Switches

You can use the niSwitch Relay Control VI or the niSwitch_RelayControl function to individually control the switches on the NI SCXI-1129.