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Universal Library Virtual Instruments (VIs) Digital I/O VIs

DBitOut.VI

Sets the state of a single digital output bit. This VI treats all of the DIO chips on a board as a single very large

port. It lets you set the state of any individual bit within this large port. If the bit or port direction is

programmable you must first use DCfgBit.VI or DCfgPort.VI to configure the bit or port for output.

Inputs: BoardNum [U32] - The board number assigned when installed with InstaCal. Can

be 0 to 100.

PortType [U32] - Specifies which digital port (AUXPORT, FIRSTPORTA).

BitNum [U32] - Specifies the bit to set.

BitValue [TF] - The bit's value (0 or 1)

Output:

ErrCode - Error code. See ErrMsg.VI

Arguments:

BoardNum The board number associated with a board when it was installed with InstaCal.

PortType There are two general types of digital I/O - 8255 and other. Some boards (DIO

Series) use an 8255 for digital I/O. For these boards,

PortType should be set to

FIRSTPORTA. Other boards don't use an 8255. For these boards PortType should be

set to

AUXPORT. Some boards have both types of digital I/O (PCI-DAS6025). Set

PortType to either FIRSTPORTA or AUXPORT depending on which digital outputs you

wish to write.

BitNum Specifies the bit number within the single large port. The specified bit must be in a

port that is currently configured as an output.

The table below shows which bit numbers are in which 82C55 and 8536 digital

chips. The CIO-DIO192 supports eight 82C55 chips—the most available on a

single board. The PCI-INT32 support two 8536 chips— the most available on a

single board.

82C55 Bit# Chip # Address 8536 Bit# Chip # Address

0 - 23 1 Base + 0 0 - 19 1 Base + 0

24 - 47 2 Base + 4 20 - 39 2 Base + 4

48 - 71 3 Base + 8

72 - 96 4 Base + 12

96 - 119 5 Base + 16

120 - 143 6 Base + 20

144 - 167 7 Base + 24

168 - 191 8 Base + 28

BitValue The output value of the bit. Value will be 0 or 1. A (0) indicates a logic-low output;

a (1) indicates a logic high output. Logic-high does not necessarily mean 5 V. See

the board manual for chip specifications.

ErrCode Error code returned from the Universal Library. Zero if no error occurred. Use the

ErrMsg VI to convert

ErrCode into a readable string.

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 108 109

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