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C141-E124-01EN 1 - 5
b. Transfer byte length or parameter list length
When this field is specified as the “Transfer Byte Length” or “Parameter List Length,” that
command specifies data length to be transferred between the INIT and the IDD, expressed as
the number of bytes. When 0 is specified in this field, data transfer is not executed, except in
cases where it is expressly stated in the individual command specifications in Chapter 3.
In commands which send parameters necessary for executing a command from the INIT to the
IDD, this field is called the “Parameter List Length,” and it specifies the total number of types
in the parameter list which the INIT is sending.
On the other hand, in commands for receiving information from the IDD (REQUEST SENSE,
INQUIRY, etc.), this field is called the “Transfer Byte Length,” and specifies the maximum
number of bytes which the INIT can receive (the number of bytes of area secured within the
INIT for receiving information). The IDD transfers either the number of effective bytes of the
type of information specified in the command, or the value specified in the “Transfer Byte
Length” field, whichever is the smallest number of bytes, and only that number, to the INIT.
(5) Control byte
Bit 76543210
0000000Link
a. Link
Command link is specified by this bit is “1.” Details of the operation of the command link are
described in Section 1.3.2.
b. Bit 7, 6 (vendor unique)
Except in cases where it is expressly specified in the individual commands, specification of
these bits has no meaning, and the IDD disregards the specified values.