Measurement-computing UL for NI LabVIEW Bedienungsanleitung PDF herunterladen (Seite 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.

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 108 109

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