User`s guide

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DDE Item Names In PCIS-DDE

4.3 PCI-7234

Digital I/O Command Set

Command Item Name

Requested/Poked

value

R/W Data Type

Digital Data Out

in digital format

PDO*

Data: xxxxxxxxxx

Example: 1234567890

Range: -2147483648 ~

2147483647

W Integer

Digital Data Out

in String mode

PSDO*

Data: xxxxxxxxxx

Example: 1234567890

Range: 0 ~ 4294967295

W String

* For InTouch, the value of Nth bit of PDO can be poked/ by using Tag.0N

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.

* To get the value of Nth bit of PDO by using Tag.0N as the item name, the

data type of PDO have to be set as integer. As mentioned before, the

“integer” is “32-bit signed integer” in InTouch. That means the range of

“integer” is –2147483648 ~ 2147483647. However, to poke 32-bit

unsigned data, use “PSDO” (the data type is string) for digital output.