Fujitsu M2488 manual Read Element Status MC command B8h, Read Element Status CDB Description

M2488 PRODUCT GUIDE MEDIA CHANGER COMMANDS

6-2.5 READ ELEMENT STATUS MC command B8h

The READ ELEMENT STATUS medium changer command requests that the target report status information for the medium-changer elements. Status for the elements is returned in blocks of bytes called element descriptors, one descriptor per element.

This command can be used to determine which elements are defined and the state of each defined element. The READ ELEMENT STATUS command is typically used preceding a MOVE MEDIUM or EXCHANGE MEDIUM command to help determine if a move or exchange operation is possible.

6-2.5.1 READ ELEMENT STATUS CDB Description

READ ELEMENT STATUS is a twelve-byte command. The bytes are shown below and described in Table 6-4. Common fields are described in paragraph 4-3.1 on page 4-4.

									BITS
BYTES		7		6	5		4			3	2	1		0
0		1		0	1		1			1	0	0		0
1
				LUN			Reserved				Element Type Code
	2-		MSB
							Starting Element Address
	3														LSB
	4-		MSB
								Number of Elements
	5														LSB
6									Reserved
	7-		MSB
									Allocation Length
	9														LSB
10									Reserved
11
						Reserved							Flag		Link

Note: Changeable fields in the CDB are shaded.

March 1997 CG00000-011503 REV. A 6-19