National Instruments NI 7831R User Manual

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National Instruments NI 7831R User Manual Manual pdf 35 page image

Chapter 2 Hardware Overview of the NI 7831RNI 7831R User Manual 2-16 ni.comFigure 2-10. Analog Output ConnectionsDigital I/OThe NI 7831R has 96 bidirectional DIO lines that you can individuallyconfigure for either input or output. When the system powers on, the DIOlines are high-impedance. To set another power-on state, you can configurethe NI 7831R to load a VI when the system powers on. This VI can then setthe DIO lines to any power-on state.Connecting Digital I/O SignalsThe DIO signals on the NI 7831R MIO connector are DGND andDIO<0..15>. The DIO signals on the NI 7831R DIO connector are DGNDand DIO<0..39>. The DIO<0..n> signals make up the DIO port and DGNDis the ground reference signal for the DIO port. The NI 7831R has one MIOand two DIO connectors for a total of 96 DIO lines.Refer to Figure B-1, NI 7831R Connector Locations, and Figure B-2,NI 7831R I/O Connector Pin Assignments, for the connector locations andthe I/O connector pin assignments on the NI 7831R.The DIO lines on the NI 7831R are TTL-compatible. When configured asinputs, they can receive signals from 5 V TTL, 3.3 V LVTTL, 5 V CMOS,and 3.3 V LVCMOS devices. When configured as outputs, they can sendsignals to 5 V TTL, 3.3 V LVTTL, and 3.3 V LVCMOS devices. Becausethe digital outputs provide a nominal output swing of 0 to 3.3 V(3.3 V TTL), the DIO lines cannot drive 5 V CMOS logic levels.LoadVOUT 0+– AOGND0x8 ChannelsNI 7831RAO0 Channel 0