National Instruments NI 9472, NI 9474

The NI 9472/9474 with screw terminal has a 10-terminal,

detachable screw-terminal connector. The NI 9472 with DSUB has

a 25-pin DSUB connector. Each channel of the NI 9472/9474 has

a terminal or pin, DO, to which you can connect a device. The

eightdigital output channels are internally referenced to the

common terminal or pin, COM. NationalInstruments recommends

you provide independent COM and Vsup wiring for each channel of

the NI9472 with DSUB to minimize current flow in the COM and

Vsup wiring. The COM pins on the NI9472 with DSUB are

internally connected..

Note You must use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9472/9474 with screw terminal.

Each channel has an LED that indicates the state of the channel.

When a channel LED is lit, the channel is on. When the LED is

dark, the channel is off. The LEDs are disabled when the chassis is

in sleep mode. Refer to the Sleep Mode section for more

information about sleep mode.