Owner's manual

118
MIDI Implementation
5. Appendices
❍ Decimal and Hexadecimal table (Hexadecimal number is shown with H.)
In MIDI documentation, data values and addresses/sizes of system exclusive messages etc.
are expressed as hexadecimal values for each 7 bits.
the following table shows how these correspond to decimal numbers.
(*) Decimal values such as MIDI channel, bank select, and program change are listed as
one(1) greater than the values given in the above table.
(*) A 7-bit byte can express data in the range of 128 steps. For data where greater precision is
required, we must use two or more bytes. For example, two hexadecimal numbers aa bbH
expression two 7-bit bytes would indicate a value of aa x 128 + bb.
(*) In the case of values which have a +/- sign, 40H=-64, 00H=0, 3FH=+63, so that the
decimal expression would be 64 less than the value given in the above chart. In the case of
two types, 40 00H = -8192, 00 00H = 0, 3F 7FH = +8191.
(*) Data marked “nibbled” is expressed in hexadecimal in 4-bit units. A value expressed as a
20byte nibble 0a 0bH has the value of a x 16 + b.
<Ex.1> What 5AH in decimal system?
5AH = 90 according to the above table.
<Ex.2> What in decimal system is 12034H in hexadecimal of every 7 bit?
12H = 18, 34H = 52 according to the above table. So 18 x 128 + 52 = 2356.
<Ex.3> What in decimal system is 0A 03 09 0D in nibble system?
0AH = 10, 03H = 3, 09H = 9, 0DH = 13 according to the above table. So ((10 x 16 + 3) x 16
+ 9) x 16 + 3 = 41885.
<Ex.4> What in nibble system is 1258 in decimal system?
____
16)1258
16) 78 ... 10
16) 4 ... 14
0 ... 4
0 = 00H, 4 = 04H, 14 = 0EH, 10 = 0AH according to the above table. So it is 00 04 0E 0AH.
● Example of system exclusive message and Checksum
calculation
On Roland system exclusive message (DT1), checksum is added at the end of transmitted
data (in front of F7) to check the message is received correctly. Value of checksum is defined
by address and data (or size) of the system exclusive message to be transmitted.
❍ How to calculate checksum (Hexadecimal number is shown with H.)
checksum is a value which lower 7 bit of the sum of address, size and checksum itself turns
to be 0.
If the address of the system exclusive message to be transmitted is aa bb ccH and data or
size is dd ee ffH,
aa + bb + cc + dd + ee + ff = sum
sum /128 =quotient and odd
When odd is 0, 0 = checksum
When odd is other than 0, 128 - odd = checksum.
■ MIDI Machine Control (MMC) Command,
Information Field/Response Reference
● Command Recognized
Command Action
01H STOP STOP
02H PLAY PLAY
03H DEFERRED PLAY PLAY
04H FAST FORWARD FF
05H REWIND REW
06H RECORD STROBE REC / PUNCH IN
07H RECORD EXIT PUNCH OUT
0DH MMC RESET RESET
40H WRITE write to Information fields
41H MASKED WRITE Set Track Status Information Fields
44H 00H LOCATE I/F LOCATE (Read Locator)
44H 01H LOCATE TARGET LOCATE (Designated Time)
4CH MOVE Move between Information
● Commands Transmitted
Command Action
01H STOP STOP
03H DEFERRED PLAY PLAY
06H RECORD STROBE REC / PUNCH IN
07H RECORD EXIT PUNCH OUT
0DH MMC RESET RESET
44H 01H LOCATE TARGET LOCATE
● Valid Information Fields/response
Command Action Valid Commands
01H SELECTED TIME CODE Current Time MOVE(FROM)
08H GP0 / LOCATE POINT Locator 1 MOVE(FROM),MOVE(TO), WRITE
09H GP1 Locator 2 MOVE(FROM), MOVE(TO), WRITE
0AH GP2 Locator 3 MOVE(FROM), MOVE(TO), WRITE
0BH GP3 Locator 4 MOVE(FROM), MOVE(TO), WRITE
0CH GP4 Locator 5 MOVE(FROM), MOVE(TO), WRITE
0DH GP5 Locator 6 MOVE(FROM), MOVE(TO), WRITE
0EH GP6 Locator 7 MOVE(FROM), MOVE(TO), WRITE
0FH GP7 Locator 8 MOVE(FROM), MOVE(TO), WRITE
4FH TRACK RECORD READY Track Status MASKED WRITE, WRITE
dec hex dec hex dec hex dec hex
0
00H 32 20H 64 40H 96 60H
1 01H 33 21H 65 41H 97 61H
2 02H 34 22H 66 42H 98 62H
3 03H 35 23H 67 43H 99 63H
4 04H 36 24H 68 44H 100 64H
5 05H 37 25H 69 45H 101 65H
6 06H 38 26H 70 46H 102 66H
7 07H 39 27H 71 47H 103 67H
8 08H 40 28H 72 48H 104 68H
9 09H 41 29H 73 49H 105 69H
10 0AH 42 2AH 74 4AH 106 6AH
11 0BH 43 2BH 75 4BH 107 6BH
12 0CH 44 2CH 76 4CH 108 6CH
13 0DH 45 2DH 77 4DH 109 6DH
14 0EH 46 2EH 78 4EH 110 6EH
15 0FH 47 2FH 79 4FH 111 6FH
16 10H 48 30H 80 50H 112 70H
17 11H 49 31H 81 51H 113 71H
18 12H 50 32H 82 52H 114 72H
19 13H 51 33H 83 53H 115 73H
20 14H 52 34H 84 54H 116 74H
21 15H 53 35H 85 55H 117 75H
22 16H 54 36H 86 56H 118 76H
23 17H 55 37H 87 57H 119 77H
24 18H 56 38H 88 58H 120 78H
25 19H 57 39H 89 59H 121 79H
26 1AH 58 3AH 90 5AH 122 7AH
27 1BH 59 3BH 91 5BH 123 7BH
28 1CH 60 3CH 92 5CH 124 7CH
29 1DH 61 3DH 93 5DH 125 7DH
30 1EH 62 3EH 94 5EH 126 7EH
31 1FH 63 3FH 95 5FH 127 7FH
2480v2_app_e.book 118 ページ ２００６年２月７日 火曜日 午後３時３３分