4.4.13MODE SENSE (6)
The normal MODE SENSE (6) sequence for the scanner is as follows:
Proce> | Bus phase | Initiator operation | ¨Æ | Target operation | |
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1 | Bus Free | Checks Bus Free |
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2 | (Arbitration) | Acquires the bus use right |
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3 | Selection | Selects the target | Æ |
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| Drives the BSY signal | |
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4 | (Message Out) | Selects the logical device | Æ |
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5 | Command | Specifies MODE SENSE (6) | Æ |
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| (CDB) |
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| Reports mode data | |
6 | Data In | Reports MODE SENSE | ¨ | ||
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| parameter data |
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7 | Status |
| ¨ | Reports GOOD status | |
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8 | Message In |
| ¨ | Reports message | |
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| (Command complete) | |
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| Releases the BSY | |
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9 | Bus Free |
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(1)MODE SENSE (6) command: Command phase (Initiator to Target)
The MODE SENSE (6) command is used for the target to report mode parameters to the initiator.
The command descriptor block (CCD) is as follows:
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | ||
Byte 0 |
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| Operation code X©1A |
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1 | Logical unit |
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| Reserved | DBD |
| Reserved |
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2 |
| PC |
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| Page code |
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3 |
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| Reserved |
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4 |
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| Allocation length |
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5 |
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| Control byte |
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4 $ 84