Fujitsu M2488 manual Element Status Page Header Field Description

M2488 PRODUCT GUIDE MEDIA CHANGER COMMANDS

6-2.5.2.2 Element Status Page

Each Element status page contains one 8 byte header followed by one or more Element descrip- tors. A diagram of the Element Status Page header is shown in Table 6-23 and described in Table 6-24. All Element descriptors in one page are for the same type of medium-changer ele- ment and are of equal length.

Table 6-23. Element Status Page Header

						BITS
BYTES	7	6	5		4		3	2	1	0
0					Element Type Code
1						Reserved
2-	MSB			Element Descriptor Length
3										LSB
4						Reserved
5-	MSB		Byte Count of Descriptor Data Available
7										LSB

Table 6-24. Element Status Page Header Field Description

BYTE	BIT	VALUE	DESCRIPTION
0			All element descriptors in one page are of the same type, the Element type code
			field indicates the medium-changer element type for the element descriptors in the
			page. The upper four bits of this field are always 0; the bottom four bits contain one
			of the code values shown in Table 6-18 on page 6- 20.
2-3	0		The Element descriptor length field indicates the number of bytes in each of the Ele-
			ment descriptors within the page. The value in this field is not adjusted for the allo-
			cation length.
5-7	2		The byte count of the descriptor data available field indicates the number of bytes of
			element descriptor data available for elements of this element type meeting the
			request in the CDB. This value is not adjusted to match the allocation length avail-
			able.

March 1997 CG00000-011503 REV. A 6-23