User`s guide

DDE Item Names In PCIS-DDE • 45
4.14 cPCI-7252
Digital I/O Command Set
Command Item Name
Requested/Poked
value
R/W Data Type
Digital Data In PDI
Data Range: 0 ~ 65535
Example: 128
R Integer
Digital Data Out
PDO
Data Range: 0 ~ 255
Example: 128
W Integer
Nth bit Digital Data In
(N is the bit number)
PBI0…PBI15
Data: 0 or 1 R Integer
Fast Nth bit Digital
Data In (N is the bit
number)
PASBI0…
PASBI15
Data: 0 or 1 R Integer
* For InTouch, the value of Nth bit of PDO/PDI can be poked/advised by
using Tag.0N (N is the bit number) as the item name. For example, to
poke the value of the 0th bit of PDO, set tagname as Tag.00, or to poke
the value of the 1st bit of PDO, set tagname as Tag.01.
* “PASBIn” and “PBIn” (n is the bit number) commands are both used for
n-th bit digital data in. For signal bit digital data input, the performance of
these two commands is almost the same. However, for multi-bits digital
data input, using “PASBIn” can get much higher performance than “PBIn”.
Hence “PASBIn” command is especially suitable for multi-bits digital data
input.