Quantum DLT 8000 Manual Página 134

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Messages
4-4 Quantum DLT 8000 Tape System
Bit
Byte
7 6 5 4 3 2 1 0
0 Extended Message (01h)
1 Extended Message Length
2 Extended Message Code
3
to
n - 1
Extended Message Arguments
Figure 41 Extended Message — Data Format
Table 43 Extended Message — Field Description
Field Description
Extended Message Length 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.
Extended Message Code The drive supports three Extended Messages. They are:
00h MODIFY DATA POINTER
01h SYNCHRONOUS DATA TRANSFER REQUEST
03h WIDE DATA TRANSFER REQUEST
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