| Description: Source of the 1 Hz time pulse used in time-tagging MDIS images. |
| Namespace Id: mess | Steward: ppi | Class Name: MDIS | Type: ASCII_Integer |
| Minimum Value: -9223372036854775808 | Maximum Value: 9223372036854775807 | Minimum Characters: None | Maximum Characters: None |
| Unit of Measure Type: None | Default Unit Id: None | Attribute Concept: None | Conceptual Domain: INTEGER |
| Status: Active | Nillable: false | Pattern: None |
| Permissible Value(s) | Value | Value Meaning |
| | 0 | Software |
| | 1 | Main Processor A (MP-A) |
| | 2 | Main Processor B (MP-B) |
| | 3 | Software |