Chapter 3 Signal Connections
© National Instruments Corporation 3-7 PCI/PXI-6703/6704 User Manual
In Figure 3-4, line 0 is configured for digital output; lines 1 and 2 are
configured for digital input.
Digital input applications include receiving TTL signals and sensing
external device states such as the switch in Figure 3-4. Digital output
applications include sending TTL signals and driving external devices such
as the LED shown in Figure 3-4.
Note
The 6703/6704 devices allow line-by-line direction control of digital I/O
connections.
Refer to Appendix A, Specifications, for a list of the digital I/O signal
ratings.
Power-up Condition
At power up, all of the DIO lines on the 6703/6704 devices are configured
as input lines.
Power Connections
Pin 1 on the I/O connector is connected to the +5 V supply from the PCI or
PXI bus power supply. This pin is referenced to DGND and can supply
power to external circuitry. The +5 V supply has a total of 0.75 A available.
The +5 V power supply has a self-resetting protection circuit breaker in
series. If the circuit breaker protection is activated, simply remove the
circuit causing the heavy current load and the circuit breaker will reset
itself. For more information on these output pins, see the Digital I/O and
Power Requirement sections in Appendix A, Specifications.
Power rating 0.75 A at +5 V ±10%, +4.55 to
+5.25 VDC at 0.75 A
Warning
Under no circumstances should you connect these +5 V power pins directly to
ground or to any other voltage source on your 6703/6704 device or any other device. Doing
so can damage your device and your computer system. National Instruments is
NOT
liable
for damage resulting from such a connection.
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