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106
After converting all 48 rows in the example we
have the following hexadecimal bytes:
Checksum
Some VL70-m system exclusive message
require a “checksum” — a data byte which is
used to check for errors during MIDI data transfer.
The checksum is calculated using the system
exclusive message start address and data (data
size). A method of calculating the checksum is
given below, using a simple data format as an
example.
1. Convert the hexadecimal start address and
data bytes (underlined in the example) to
decimal format using the chart below. Each
two-digit hexadecimal byte becomes a
decimal number.
• “mm”, the Model ID, is “57” when the VOICE
sound module mode is selected, and “4C” when
the VL-XG sound module mode is selected.
5. Plug the data derived from the bitmap design
into the “xx xx .... xx xx” portion of the
bitmap window data format, and you have
the data stream required to display the
design on the VL70-m display.
FO 43 0n
mm
ss ss ss xx xx •• xx xx CS F7
Checksum
Data (size)Model ID
Start address
Device number.
HEX DEC
00 0
01 1
02 2
03 3
04 4
05 5
06 6
07 7
08 8
09 9
0A 10
0B 11
0C 12
0D 13
0E 14
0F 15
HEX DEC
10 16
11 17
12 18
13 19
14 20
15 21
16 22
17 23
18 24
19 25
1A 26
1B 27
1C 28
1D 29
1E 30
1F 31
HEX DEC
20 32
21 33
22 34
23 35
24 36
25 37
26 38
27 39
28 40
29 41
2A 42
2B 43
2C 44
2D 45
2E 46
2F 47
HEX DEC
30 48
31 49
32 50
33 51
34 52
35 53
36 54
37 55
38 56
39 57
3A 58
3B 59
3C 60
3D 61
3E 62
3F 63
Appendix
01 0E 30 40 00 01 07 09 13 22 43 23 13 09 07 01
70 0C 03 00 00 70 7C 72 79 48 48 48 79 72 7C 70
00 00 00 40 20 00 00 00 00 40 20 40 00 00 00 00