Measurement Computing UL for NI LabVIEW - Manual (Page 79)

Universal Library Virtual Instruments (VIs) Digital I/O VIs
DOut.VI
Writes a byte to a digital output port.
Inputs: BoardNum [U32] - The board number assigned when installed with InstaCal. Can
be 0 to 100.
PortNum [I32] - Specifies which digital I/O port to set.
DataValue [I32] - Byte value to output to port.
Output: ErrCode [I32] - Error code. See ErrMsg.VI
Arguments:
BoardNum The board number associated with a board when it was installed.
PortNum If the port type is not AUXPORT , the specified port must be configured for output.
For many boards, AUXPORT is not configurable. However, some later boards do
require that the AUXPORT be configured using DCfgPort.VI or DCfgBit.VI.
Please see board details for more information.
The table below shows which ports are in which 82C55 and 8536 digital chips. The
most 82C55 chips on a single board is eight (8), on the CIO-DIO192. The most (2)
8536 chips occur on the CIO-INT32.
Mnemonic Bit # 8255 Chip # Chip Address 8536 Chip # Chip Address
FIRSTPORTA 0 - 7 1A Base + 0 1A Base + 0
FIRSTPORTB 8 - 15 1B 1B
FIRSTPORTCL 16 - 19 1CL 1C
FIRSTPORTCH 20 - 23 1CH Not present
SECONDPORTA 24 - 31 2A Base + 4 2A Base + 4
SECONDPORTB 32 - 39 2B 2B
SECONDPORTCL 40 - 43 2CL 2C
SECONDPORTCH 44 - 47 2CH No port C High in 8536 chips
and so on, to the last chip on the board as: THIRDPORTx, FOURTHPORTx, FIFTHPORTx, SIXTHPORTx,
SEVENTHPORTx and...
EIGHTHPORTA 168 - 175 8A Base + 28
EIGHTHPORTB 176 - 183 8B
EIGHTHPORTCL 184 - 187 8CL
EIGHTHPORTCH 188 - 191 8CH
Data Value Value to write to the specified port. The size of the ports varies. If it is an eight-bit
port, then the output value must be in the range 0 to 255. If it is a four-bit port, the
value must be in the range 0 to 15.
ErrCode Error code returned from the Universal Library. Zero if no error occurred. Use the
ErrMsg VI to convert ErrCode into a readable string.
Important - Read board-specific information in UL User's Guide
Refer to the example programs and the board-specific information contained in the Universal Library User's
Guide (available on our web site at
www.mccdaq.com/PDFmanuals/sm-ul-user-guide.pdf ) for clarification of
valid PortNum values.
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