VISA In 16

Reads in 16-bits of data from the specified memory space, assigned memory base + offset. You do not need to call the VISA Map Address function before you call this function.

address space specifies the address space without requiring VISA Map Address to be called. The following table lists the valid entries for specifying address space:

Value Description
VXI, VME, and GPIB-VXI VI_A16_SPACE (1)

VI_A24_SPACE (2)

VI_A32_SPACE (3)

PXI VI_PXI_CFG_SPACE (10)

VI_PXI_BAR0_SPACE (11) to VI_PXI_BAR5_SPACE (16)

VISA resource name specifies the resource to be opened. This control also specifies the session and class. Refer to VISA Resource Name Control for more information.
offset is the offset, in bytes, of the device to read from.

INSTR Specific

The offset specified in the VISA In 8, VISA In 16, and VISA In 32 operations for an INSTR Resource is the offset address relative to the device's allocated address base for the corresponding address space that was specified. For example, if address space specifies A16 SPACE, then offset specifies the offset from the logical address base address of the specified VXI device. If address space specifies A24 or A32 SPACE, then offset specifies the offset from the base address of the VXI device's memory space allocated by the VXI Resource Manager within VXI A24 or A32 space.

MEMACC Specific

For a MEMACC Resource, offset specifies an absolute address.

error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurs before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a non-zero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
dup VISA resource name is a copy of the VISA resource name that is passed out of the VISA functions. Refer to VISA Resource Name Control for more information.
value contains the data read from address space.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a non-zero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.