| Spec | Description |
|---|---|
| S1 | Loop address |
| S2 | PCU address |
| S3 | Module address |
| S4 | INSEM01 interface (FC241) |
| S5 | Next interface (FC244) |
| S6 | Channel 1 interface (FC245) |
| Block | Type | Description |
|---|---|---|
| N | N/A | Not used |
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