2.5.224 RTDOper

The RTDOper structure specifies the variant data returned from an RTD server for real-time data (RTD).

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grbit
rtdVt (variable)
...

grbit (4 bytes): An unsigned integer that specifies the type of the variant data stored in rtdVt. MUST be a value from the following table:

Value	rtdVt Data Type	Meaning
0x00000001	Xnum	The returned variant is an Xnum (section 2.5.342).
0x00000002	RTDOperStr	The returned variant is a RTDOperStr. MUST be less than 256 characters long.
0x00000004	Boolean	The returned variant is a 4-byte Boolean (section 2.5.14) value.
0x00000010	Signed integer	The returned variant is a 4-byte signed integer indicating an error code.
0x00000800	Signed integer	The returned variant is a 4-byte signed integer used for purposes other than an error code.
0x00001000	RTDOperStr	The returned variant is a RTDOperStr. MUST be greater than or equal to 256 characters long.

rtdVt (variable): A structure that contains the variant data. The meaning of the data depends on the specific RTD server. The type of the variant data is specified by grbit.