DIS Data Dictionary - PDU Data

Current standard: IEEE 1278.1

Data Query PDU

Size: 384
Description: A request for data from an entity shall be communicated by issuing a Data Query PDU The Data Query PDU shall contain the following fields:

a) Simulation Management PDU Header - These fields shall identify the PDU header information, the originating entity, and the intended receiving entity. The Simulation Management PDU Header shall be represented by the Simulation Management PDU Header Record described in 5.3.29.
b) Time Interval - This field shall specify the time interval between issues of Data PDUs. A value of zero in this field shall mean that the requested data should be sent once and not at any previously specified time interval. This field shall be represented by a timestamp (see 5.3.31).
c) Request ID - This field shall identify the data query request being made by the Simulation Manager. This field shall be represented by a 32-bit unsigned integer.
d) Datum Information - This record shall specify the types of Datum for which information is required. Datum IDs, but not Datum values, are listed in the Data Query Datum Specification Record (see 5.3.9).

The Data Query PDU is represented in Table 49.

PDU Components:

Item Name	Bit Length	Opt	Opt Ctl	Rpt	Rpt Ctl
PDU Header Record	96
Originating Entity ID Record	48
Receiving Entity ID Record	48
Request ID Field	32
Time Interval Field	32
Number of Fixed Datum Records Field	32
Number of Variable Datum Records Field	32
Fixed Datum ID Field	32	Yes	Number of Fixed Datum Records	Yes	Number of Fixed Datum Records
Variable Datum ID Field	32	Yes	Number of Variable Datum Records	Yes	Number of Variable Datum Records

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