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Chapter 3
Digital I/O
The input lines on the NI 6511 consist of input photocouplers, which react to a voltage
differential rather than only to a voltage increase. If the voltage connected to a digital input is
either greater than or less than the voltage connected to P
X
.COM by at least the logic threshold,
the reading on the digital line will be logic high, even though in one instance the digital line has
a lower voltage level than P
X
.COM.
For more information, refer to the
NI 6512/6513 I/O Connector
The 100-pin high-density SCSI connector on the NI 6512/6513 provides access to the digital
inputs and outputs. The digital I/O available on this connector includes 64 outputs. For easy
connection to the digital I/O connector, use the National Instruments SH100-100-F shielded
digital I/O cable with the SCB-100 connector block, or use the R1005050 ribbon cable with the
CB-50 or CB-50LP connector block. For more information on digital I/O connectivity options,
refer to Chapter 5,
Caution
Do not make connections to the digital I/O that exceed the maximum I/O
specifications. Doing so could permanently damage the NI 6512/6513 and the
computer. Refer to the
NI 651x Specifications
, available at
ni.com/manuals
, for
information about maximum input ratings.
The output lines on the NI 6512 consist of photocouplers and Darlington arrays. To connect to
these signals, connect a 5 V to 30 V power supply to VCC, connect COM (GND) to ground, and
cross a load between digital output and COM (GND).
The output lines on the NI 6513 consist of photocouplers and Darlington arrays. To connect to
these signals, connect a 5 V to 30 V power supply to COM (VCC), connect GND to ground, and
cross a load between digital output and COM (VCC).
For more information, refer to the
NI 6514/6515 I/O Connector
The 100-pin high-density SCSI connector on the NI 6514/6515 provides access to the digital
inputs and outputs. The digital I/O available on this connector includes 32 inputs and 32 outputs.
For easy connection to the digital I/O connector, use the National Instruments SH100-100-F
shielded digital I/O cable with the SCB-100 connector block, or use the R1005050 ribbon cable
with the CB-50 or CB-50LP connector block. For more information on digital I/O connectivity
options, refer to Chapter 5,
.
Caution
Do not make connections to the digital I/O that exceed the maximum I/O
specifications. Doing so could permanently damage the NI 6514/6515 and the
computer. Refer to the
NI 651x Specifications
, available at
ni.com/manuals
, for
information about maximum input ratings.