National Instruments NI 781xR Instrukcja Użytkownika Pobierz pdf (Strona 28)

Specifications

This appendix lists the specifications of the NI 781xR. These specifications

are typical at 25 °C unless otherwise noted.

Digital I/O

Number of channels ............................... 160 input/output

Compatibility ......................................... TTL

Digital logic levels

Maximum output current

max

(sink) ........................................ 5.0 mA

max

(source) .................................... 5.0 mA

Input leakage current.............................. ±10 µA

Power-on state........................................ Programmable by line

Data transfers ......................................... Interrupts, programmed I/O

Protection

Input ................................................ –0.5 to 7.0 V

Output ............................................. Short-circuit (up to eight lines

can be shorted at a time)

Level Min Max

Input low voltage (V

)

Input high voltage (V

)

0.0 V

2.0 V

0.8 V

5.5 V

Output low voltage (V

where I

OUT

= –I

max

(sink)

Output high voltage (V

where I

OUT

= I

max

(source)

—

2.4 V

0.4 V

—

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 47 48

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