Current standard: IEEE 1278.1
| Value | Description |
|---|---|
| 0 | Other |
| 1 | DIS PDU version 1.0 (May 92) |
| 2 | IEEE 1278-1993 |
| 3 | DIS PDU version 2.0 - third draft (May 93) |
| 4 | DIS PDU version 2.0 - fourth draft (revised) March 16, 1994 |
| 5 | IEEE 1278.1-1995 |
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