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4.4.10 SEND command
The following table shows the normal sequence of the SEND command when used
with this scanner.
Step Bus phase Initiator operation ¨ Æ Target operation
1 BUS FREE Verifies bus free
2 ARBITRATION Obtains bus>usage
right
3 SELECTION Selects target Æ
Drives BSY signal
4 MESSAGE OUT Selects logical unit Æ
5 COMMAND Specifies SEND
(CDB)
Æ
6 DATA OUT Æ Transfer data
7 STATUS ¨ Reports GOOD status
8 MESSAGE IN ¨ Reports Command Complete
Releases BSY signal
9 BUS FREE
(1) SEND command: COMMAND phase (initiator Æ target)
The SEND command is used by an initiator to send data to a target. The CDB of
this command is shown in the following illustration.
Byte 0
1
2
3
4
5
6
7
8
9
Transfer identification
Operation code X©2Aπ
Logical unit number RelAdr(Reserved)
Transfer length
Control byte
7 6 5 4 3 2 1 0
Transfer data type
(Reserved)
(MSB)
(LSB)
(LSB)
(MSB)
4 $ 68