Roland CG-8 Supplementary Manual page 13

4. References
■Table of the corresponding a decimal
number and hexadecimal number
Hexadecimal numbers are described with "H".
The address or size of the data value or exclusive message is described in
hexadecimal notation. The table of the corresponding decimal numbers and
hexadecimal number as follows:
Decimal Hex Decimal Hex
0 00H 32 20H
1 01H 33 21H
2 02H 34 22H
3 03H 35 23H
4 04H 36 24H
5 05H 37 25H
6 06H 38 26H
7 07H 39 27H
8 08H 40 28H
9 09H 41 29H
10 0AH 42 2AH
11 0BH 43 2BH
12 0CH 44 2CH
13 0DH 45 2DH
14 0EH 46 2EH
15 0FH 47 2FH
16 10H 48 30H
17 11H 49 31H
18 12H 50 32H
19 13H 51 33H
20 14H 52 34H
21 15H 53 35H
22 16H 54 36H
23 17H 55 37H
24 18H 56 38H
25 19H 57 39H
26 1AH 58 3AH
27 1BH 59 3BH
28 1CH 60 3CH
29 1DH 61 3DH
30 1EH 62 3EH
31 1FH 63 3FH
* The decimal notation of the MIDI channel, Bank Select or Program Change is
described as the number that is added 1 to the decimal number on the table
above.
* In hexadecimal notation, every 7 bit, the value that is described as the data of 1
byte can divide into 128 steps at the maximum. For more resolution, use data of
more than one byte. For example, the value that is described in hexadecimal
notation of 2 byte data every 7 bit such as "aabb" is "aa x 128 + bb".
Example 1: Decimal notation of "5AH"
"5AH" = 90 (from table above)
Example 2: Decimal notation of the value that is described in hexadecimal notation
every 7bit of 2 byte data
12H = 18, 34H = 52 (from table above), 18 x 128 + 52 = 2356
■Examples of the MIDI message
Hexadecimal numbers are described with "H".
Example 1: 92H 3EH 5F
"9n" is the Note ON status and "n" is the MIDI channel number.
2H = 2, 3EH =62, 5FH =95,
This is the Note On message of MIDI CH = 3, note number 62 (D4), velocity 95.
Example 2: CEH 49H
"CnH" is the Program change status and "n" is the MIDI channel number.
EH = 14, 49H =73,
This is the Program change message of MIDI CH = 15, Program number 74 (Flute
for GS).
Decimal Hex Decimal Hex
64 40H 96 60H
65 41H 97 61H
66 42H 98 62H
67 43H 99 63H
68 44H 100 64H
69 45H 101 65H
70 46H 102 66H
71 47H 103 67H
72 48H 104 68H
73 49H 105 69H
74 4AH 106 6AH
75 4BH 107 6BH
76 4CH 108 6CH
77 4DH 109 6DH
78 4EH 110 6EH
79 4FH 111 6FH
80 50H 112 70H
81 51H 113 71H
82 52H 114 72H
83 53H 115 73H
84 54H 116 74H
85 55H 117 75H
86 56H 118 76H
87 57H 119 77H
88 58H 120 78H
89 59H 121 79H
90 5AH 122 7AH
91 5BH 123 7BH
92 5CH 124 7CH
93 5DH 125 7DH
94 5EH 126 7EH
95 5FH 127 7FH
MIDI implementation
Example 3: EAH 00H 28H
"EnH" is the Pitch bend status and "n" is the MIDI channel number.
Second byte (00H = 0) is the LSB of the pitch bend value and third byte (28h - 40) is
the MSB of the pitch bend value. For pitch bend value, the value of 40H 00H (64 x
128 + 0 =8192) is regarded as 0. In this case, the pitch bend value is:
28H 00H - 40H 00H = 40 x 128 + 0 - (64 x 128 + 0) = 5120 - 8192 = -3072
When the pitch bend sensitivity is set to 2 and half notes, the value -8192 (00H 0H)
varies
-200 cent of pitch. -200 x (-3072) /-8192 = -75
The message transmit the message of the pitch bend of -75 cent to MIDI CH = 11.
■Examples of the exclusive message and
calculation of checksum
Hexadecimal numbers are described with "H".
In the case of the exclusive message of Roland (RQ1, DT1), the message is
transmitted with checksum after the data to check if the message is received
correctly. The checksum value depends on the transmitted address, data or size of
the exclusive message.
●To calculate checksum
Hexadecimal numbers are described with "H".
The checksum is the value that regard the value of the lower 7bit that is added
address, size and checksum value as 0. For example, when the exclusive message
address that you want transmit is "aaH bbH ccH" and the data that you want
transmit is "ddH eeH",
aaH + bbH + ccH + ddH + eeH = total
Total / 128 = quotient ... rest
128 - rest = Checksum
Example: To assign the Playback speed control to the Modulation of the Control
change
(DT1)
The start address of the Playback speed control is "01H 10H 00H" and the
parameter value of the modulation of the Control change is "00H 01H",
F0H 41H 10H 00H 00H0EH 12H 01H 10H 00H 00H 01H 6EH
(1) (2) (3) (4)
(1) Exclusive status
(2) ID number (Roland)
(3) Device ID (17)
(4) Model ID (CG-8)
(5) Command ID (DT1)
(6) Address
(7) Data
(8) Checksum
(9) EOX
Calculate checksum.
01H + 10H + 00H + 00H + 01H = 1 + 16 + 0 + 0 + 1 = 18 (sum)
18 (total) / 128 = 0 (quotient) ... 18 (rest)
Checksum = 128 - 18 (rest) = 110 = 6EH
The transmitted message is:
F0H 41H 10H 00H 00H 0EH 12H 01H 10H 00H 00H 01H 6EH F7H
(5) (6) (7) (8)
F7H
(9)
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