Data returned – HP Q153090901 User Manual
Page 144
Commands
144
Data returned
The returned Parameter Data contains a 4-byte header followed by one or more command
descriptors:
Each command descriptor contains either a supported Operation Code or an Operation Code/
Service Action combination. The format of each descriptor is as follows:
7
6
5
4
3
2
1
0
0
(MSB)
Command Data Length
3
(LSB)
Command Data Length
The amount of Parameter Data available for return minus the size of the
header.
7
6
5
4
3
2
1
0
0
Operation Code
1
Reserved (0)
2
(MSB)
Service Action
3
(LSB)
4
Reserved (0)
5
Reserved (0)
ServActv
6
(MSB)
CDB Length
7
(LSB)
Operation Code The operation code of the supported command.
Service Action
A supported service action of the operation code. If no service actions are supported
this field will be 00h.
ServActv
0 No service actions are supported and the Service Action field should be
ignored.
1 This operation code supports service actions and the Service Action field
contains a valid service actions.
CDB Length
The length of the CDB for this operation code or operation code/service action
command.