Measurement Computing UL for NI LabVIEW - Manual (Page 107)

Universal Library Virtual Instruments (VIs) Miscellaneous VIs
InByte.VI / InWord.VI
Reads a byte or a word from a hardware register on a board.
Summary:
Inputs: BoardNum [U32] - The board number assigned when installed with InstaCal. Can
be 0 to 100
PortNum [U32] - Register on the board to read.
Outputs: DataValue [I32] - Value read from port.
ErrCode [I32] - Error code. See ErrMsg.VI
Arguments:
BoardNum The board number associated with a board when it was installed.
PortNum Register within the board. Boards are set to a particular base address. The registers
on the boards are at addresses that are offsets from the base address of the board
(BaseAdr + 0, BaseAdr + 2, etc.). This argument should be set to the offset for the
desired register. This function takes care of adding the base address to the offset so
that the board's address can be changed without changing the code.
DataValue Current value of the specified register.
ErrCode Error code from the Universal Library. Zero if no error occurred. Use the ErrMsg
VI to convert ErrCode into a readable string.
Notes:
InByte.VI is used to read eight-bit ports. InWord.VI is used to read 16-bit ports.
107