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2.4.2 Digital Outputs
The Digital I/O Card has 16 digital outputs, OUT00–OUT15, which can each sink or
source up to 200 mA. Figure 11 shows a wiring diagram for using the digital outputs in a
sinking or a souring configuration.
The rn_digOutConfig() function call simultaneously configures all the output chan-
nels to a “safe state” on power-up for sinking or sourcing outputs by setting the channels
to a high impedance. The “safe state” is considered to be all zeros, a disabled state for
sourcing outputs.
All the digital outputs sink and source actively. They can be used as high-side drivers,
low-side drivers, or as an H-bridge driver. When the Digital I/O Card is first powered up
or reset, all the outputs are disabled, that is, at a high-impedance status, until the rn_
digOutConfig() software function call is made. The rn_digOutConfig() call sets
the initial state of each digital output according to the configuration specified by the user,
and enables the digital outputs to their initial status.
SINKING OUTPUT
K1 or K2
D-REF
OUTPUT[00?15]
SOURCING OUTPUT
K1 or K2
D-REF
OUTPUT[00?15]
Figure 11. Digital I/O Card Digital Outputs
24
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