National Instruments 700 - Manual (Page 32)

Chapter 3 Signal Connections
© National Instruments Corporation 3-13 DAQCard-700 User Manual
TTL Signal
Digital
Input
Port
Digital
Output
Port
22 DIN0
19
DGND
I/O Connector
DAQCard-700
LED
+5 V
+5 V
29 DIN7
30 DOUT0
Figure 3-6. Digital I/O Signal Connections
Power Connections
Pin 49 of the I/O connector sends +5 V from the PCMCIA I/O channel power supply. This pin is
referenced to DGND and can be used to power external digital circuitry that draws up to 1 A.
Pin 49 is connected to a 1 A resettable fuse on the card. The actual current available from this
signal may be less than 1 A, depending on the computer. Notice also that any current drawn
from this line adds to the power requirements from the computer.
Warning: Do NOT exceed any of the maximum ratings of input or output signal connections
on the DAQCard-700. Doing so can damage the DAQCard-700 and the computer.
Exceeding the maximum connections includes connecting any power signals to
ground and vice versa. National Instruments is
NOT liable for any damages
resulting from any such signal connections.