DIS Data Dictionary - PDU Data

Created by JDBE at Ft. Huachuca, Arizona

Current standard: IEEE 1278.1


Comment PDU

Size: 320
Description: Arbitrary messages (character strings for example) shall be entered into the data stream by using a Comment PDU. The Comment PDU shall consist of 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) Number of Fixed Datum Fields - This field shall specify the number of fixed datum fields required to supply database names or character fields which are less than 32 bits. This field shall be represented by a 32-bit unsigned Integer.
c) Number of Variable Datum Fields - This field shall specify the number of variable datum fields required to supply database names or character fields which exceed 32 bits. This field shall be represented by a 32-bit unsigned iteger.
d) Variable Datum Values - These fields shall specify the types of Variable Datum, their length and their value. This field shall be represented by a Variable Datum Record (see 5.3.32).

The maximum number of Fixed and Variable Datum Records in a Comment PDU is a function of the maximum PDU size specified in the Standard for Interactive Simulation - Communication Services and Profiles, and must adhere to the following relationship



The Comment PDU is represented in Table 53.

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
Number of Fixed Datum Records Field 32
Number of Variable Datum Records Field 32
Variable Datum Record Record 64 Yes Number of Variable Datum Records Yes Number of Variable Datum Records
For questions regarding the content of the DIS Data Dictionary,
please contact Jeff Wicks, jwicks@ist.ucf.edu

Other problems may be reported to the WebMaster,www@sc.ist.ucf.edu

Generated by the DIS Data Dictionary