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Quantum DLT 7000 Tape System 4-3
Table 4–2 Supported Messages
Message Message Code Direction
ABORT 06h Out
BUS DEVICE RESET 0Ch Out
COMMAND COMPLETE 00h In
DISCONNECT 04h In Out
EXTENDED MESSAGE (SDTR and wide Data
Transfer Request)
*
01h In Out
IDENTIFY 80h – FFh In Out
IGNORE WIDE RESIDUE 23h In
INITIATOR DETECTED ERROR 05h Out
LINKED COMMAND COMPLETE 0Ah In
LINKED COMMAND COMPLETE (with flag) 0Bh In
MESSAGE PARITY ERROR 09h Out
MESSAGE REJECT 07h In
NO OPERATION 08h Out
RESTORE POINTERS 03h In
SAVE DATA POINTER 02h In
WIDE DATA TRANSFER REQUEST * 03h In Out
*
Extended messages (Figure 4–1).
Two-byte messages consist of two consecutive bytes. The value of the first byte,
as defined in Table 4–1, determines which message is to be transmitted. The
second byte is a parameter byte that is used as defined in the message
description.
A value of 1 in the first byte indicates the beginning of a multiple-byte extended
message. The minimum number of bytes sent for an extended message is three.
The extended message format is shown in Figure 4–1 and the data fields are
described in Table 4–3.