National Instruments 653X Manuale Utente

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LabVIEW—Use one of the top-level VIs: the Read From Digital Line 
VI to read from a digital port, and the Write to Digital Line VI to write 
to a digital port. The digital channel number is 4 and the port width is 
4. If one of the control/timing lines is used or reserved and you are 
using the write or read port VIs, use the Line Mask parameter in the 
DIO Port Write VI to mask out the appropriate lines.

If you want to communicate with an external device using an exchange of 
signals to request and acknowledge each data transfer, use the handshaking 
I/O mode.

You can choose between a width of eight, 16, or 32 bits. Use the following 
table to find the valid combinations of ports and timing controllers you can 
use based on the width of data you want to transfer.

You can choose to send data from the 653X device to the peripheral device 
(output) or from the peripheral device to the 653X device (input).

Table 2-2.  Port and Timing Controller Combinations

8 bits

Port 0 (DIOA<0..7>)

Group 1

Port 2 (DIOC<0..7>)

Group 2

16 bits

Port 0, Port 1

Group 1

Port 2, Port 3

Group 2

32 bits

Port 0, Port 1, Port 2, Port 3

Group 1