xPC Target

PXI-6508 Digital Input

The PXI-6508 has four 8255 chip with 3 ports (A,B,C). Each port has a maximum of 8 digital I/O lines that can be configured as inputs or outputs.

Use a separate diver block for each port. By selecting the digital input driver block, the port is configured as input.

Scaling of Input to Output

Hardware Input	Block Output Data Type	Scaling
TTL	double	TTL low = 0.0 TTL high = 1.0

Driver Block Parameters

Channel Vector - Enter numbers between 1 and 8 to select the digital input lines used with this port. This driver allows the selection of individual digital input lines in any order. The number of elements defines the number of digital lines used.

For example, to use all of the digital inputs for one port, enter

[1,2,3,4,5,6,7,8]

Number the lines beginning with 1 even if the board manufacture starts numbering the lines with 0.

Port - From the list choose either A, B, or C. The I/O board has a 8255 chip with 3 ports. The Port parameter defines which port of the 8255 chip is used for this driver block. Each port has a maximum or 8 digital lines that can be configured as inputs or outputs depending on which driver block is chosen. In each case, one block is needed for each port.

Chip - From the list choose 1, 2, 3, or 4.

Sampletime - Enter a base sample time or a multiple of the base sample time.

Sampletime - Enter a base sample time or a multiple of the base sample time.

PCI Slot (-1:autosearch) - Enter a number between -1 and n.

If only one board of this type is physically present in the target PC, enter

-1 

PXI-6508

PXI-6508 Digital Output