DECASYNC OPC Items

Standard Items

Protocol Items

Item

Data Type

Description

0-65535

R4

Function number to read. If a function number is a command (write) it will need to be modified with a “C” on the end of the address. Example: MyDevice.254C

CommRejectStatus

Byte

The communications reject status byte is used to indicate one of the following reject conditions on the first three bits 0000 0111.

Station not in remote mode = 0000 0001.
Command value out of limits = 0000 0010.
Invalid function number = 0000 0100.

Note

Each item name can be followed by the <Primary> or <Secondary> specification. When one of these is included in the item name, the data will be retrieved using the primary or secondary connection (as specified) instead of the current connection.

Integer Bit Offset Modifier

Integer bit offsets are supported for read operations. To access a bit offset, use the following format:
Address/2 – To access the third position (zero based) bit as a Boolean

Boolean Invert Modifier

To invert the display value of a Boolean offset tag, use the following format:
Address/1! – Will display to logical inverse of the actual value.