User`s guide

Summary of I/O Operations
The following table summarizes the V+ I/O instructions:
Keyword Type Function
AIO.IN RF Read a channel from one of the analog IO boards.
AIO.INS RF Test whether an analog input or output channel is
installed.
AIO.OUT PI Write to a channel on one of the analog IO boards.
ATTACH PI Make a device available for use by the application
program.
BITS PI Set or clear a group of digital signals based on a value.
BITS RF Read multiple digital signals and return the value
corresponding to the binary bit pattern present on
the signals.
$DEFAULT SF Return a string containing the current system default
device, unit, and directory path for disk file access.
DEF.DIO PI Assign third-party digital I/O boards to standard V+
signal numbers, for use by standard V+ instructions,
functions, and monitor commands.This instruction
requires the Third-Party Board Support license.
DETACH PI Release a specified device from the control of the
application program.
DEVICE PI Send a command or data to an external device and,
optionally, return data back to the program. (The
actual operation performed depends on the device
referenced.)
DEVICE RF Return a real value from a specified device. The value
may be data or status information, depending upon
the device and the parameters.
DEVICES PI Send commands or data to an external device and
optionally return data. The actual operation
System Input/Output Operations
Summary of I/O Operations
(Undefined variable: Primary.Product_Name_V)Language User's Guide, version
17.x
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