National Instruments NI 2590/2591 PXI Interface

Chapter2 NI2590/2591 Operation

©NationalInstruments Corporation 2-7 NI2590/2591 User Manual

intervention.You can configure the switch module to process the scan list

once or to continuously loop through the scan list.

PXI Interface

Youcan configure and contro ly ourNI 2590/2591s witch module through

the PXI interface, taking advantage of PXI features. The NI 2590/2591

usest he PXI TTL triggers to synchronize scanning with a measurement

device such as the NI 5102 (PXI) 20 MS/s oscilloscope, or the NI 5411

forPX I arbitrary waveform generator.

The NI 2590/2591 can use an external trigger input to advance between

scansetups in a scan list. Using the driver software, you can configure the

switchmodule to route the external trigger from any of the PXI TTL trigger

lines or the PXI star trigger. Alternatively, you can use a software

command to trigger the switch module.

All externaltrigger lines are compati ble with TTL voltagelevels and are

edge sensitive.The minimum pulse w idth from the PXI TTL triggers and

PXI star trigger is 70 ns.

The NI 2590/2591 can generate a scanner advanced trigger to indicate

when the switch module is set up and ready to take measurements. Using

the driver software, you can configure the switch module to route the

scannera dvanced (SCANADV) trigger to any PXI TTL trigger line or to

the PXI star trigger. You can configure the switch module to generate the

SCANADV trigger when a relay has settled (or debounced).

Because the NI 2590/2591h as open-collector driverson the PXI TTL

triggerlines, you can have multiple switch modules using the same trigger

line in the multiboard SCANADVmode.