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*1 <ab>
DT status (MS 3 bits)
0-2: Reserved
3: DT status of encapsulated MIDI command
4: DT status of device specific messages
5 - 7: Reserved
*2 data bytes
The format and length vary depending on the DT status byte.
The first byte of the DT message is the channel number (There are up to 128 channels).
Several DT commands may be contained in one DT message.
The EOX (F7) command is used at the end of the DT message.
From a standpoint of error correction, we recommend inserting breaks in DT messages at 100 ms intervals.
DT command format (Table 1)
1: Encapsulated MIDI command (for details, see Table 2)
Status
Substatus
Databyte[0]
Databyte[1...]
2: Device specific messages
2.1 parameter dump
Status
Substatus
Databyte[0]
Databyte[1 - 2]
Databyte[3 - 4]
Databyte[5...]
CAUTION: When recording to a hard disk, one unit is used for multi-channel recording/
playback. For this reason, parameters are separated into Common and
Channel parameters. The parameter addresses used are as follows:
Channel parameter base address = h'0
Common parameter base address = h'2000
Sub status (LS 4 bits)
Sub status equals to MIDI status code
Substatus=0 → parameter dump
Substatus=1 → parameter request
(See Table 1 for DT command formats.)
3
MIDI status byte
channel
MIDI data bytes
4
0
channel
parameter address
byte count
data
Add-29
29 29
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