Pioneer DVD-V7400 Command Protocol Manual page 46

The head address is a relative address. The base address is (BP = 1216)
and (BP = 1216) is the head byte of the Barcode & Blackboard Data in this
format.
(11)
Comprises the body of the data
(12)
checksum of the data that indicates the result of adding up BP 0 through BP
9315 and shows in HEX (double word) format
Format of Barcode / Command Stack data in the data:
The length of Barcode / Command Stack data is 16 bytes. This is a fixed
length. Each byte is made up of aH (upper nibble) and one digit of the
Barcode Command (lower nibble). The Barcode Command length is available
up to 16 digits. If the command length is less than 16 digits, it fills with (00H).
Example:
Segment Play Command : Title 02, from Frame 3600 to Frame 4800
> 4020036000048007
BP
1216 + BARCODE_SRP #n
+ 1
+ 2
+ 3
+ 4
+ 5
+ 6
+ 7
+ 8
+ 9
+ 10
+ 11
+ 12
+ 13
+ 14
+ 15
*BARCODE_SRP #n : Barcode #n Search Pointer
Data
a4H
a0H
a2H
a0H
a0H
a3H
a6H
a0H
a0H
a0H
a0H
a4H
a8H
a0H
a0H
a7H
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Command Descriptions
Explanations