Figure 4-1 Extended Message - Data Format; Table 4-3 Extended Message - Field Description - Quantum DLT 4000 Product Manual

Messages
Bit 7
Byte
0
1
2
3 to n-1
Figure 4–1 Extended Message - Data Format
Table 4–3 Extended Message - Field Description
Field
Extended Message
Length
Extended Message Code
4-4
6 5 4
Extended Message (01h)
Extended Message Length
Extended Message Code
Extended Message Arguments
Description
This field specifies the length, in bytes, of the Extended
Message Code plus the Extended Message Arguments that
follow. Therefore, the total length of the message is equal to
the Extended Message Length plus 2.
A value of 0 for the Extended Message Length indicates that
256 bytes follow.
The drive supports some Extended Messages. They are:
01h SYNCHRONOUS DATA TRANSFER REQUEST
80h – FFh Vendor Unique (for more information, refer to the
section for the INQUIRY command in Chapter 5).
Quantum DLT 4000 Tape Drive
3 2 1 0