Chapter 4
Theory of Operation
©
National Instruments Corporation
4-3
Digital I/O Connector
All digital I/O is transmitted through a standard, 100-pin, female connector
for the DAQPad-6508 or 100-pin screw terminal with a strain-relief clamp
for the DAQPad-6507. Pins 49 and 99 are connected to +5 V through a
self-restarting protection fuse (F1). See Figure 4-1 for its location. This
+5 V supply is often required to operate I/O module mounting racks.
Pins 50 and 100 are connected to ground. See the
section in Chapter 1,
, as well as Chapter 2,
, and the
Digital I/O Signal Connections
section in
, for additional information.
