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Chapter 4 Theory of Operation
©
National Instruments Corporation 4-3 PC-DIO-24/PnP User Manual
Digital I/O Connector
All digital I/O is transmitted through a standard, 50-pin, male
connector. Pin 49 is connected to +5 V through a resettable protection
fuse. You can use this +5 V supply to operate I/O module mounting
racks. Even-numbered pins are connected to ground. See the
Optional
Equipment
section in Chapter 1,
Introduction
, as well as Chapter 3,
Signal Connections
, for additional information.