Alesis QS7.1 Manuel de service télécharger pdf (Page 51)

Alesis QS Series Keyboards Service Manual V1.00 42 11/19/06

8.00 Appendix C Sys-Ex Implementations

8.10 S6 Sys-Ex

SYSTEM EXCLUSIVE FORMAT

4/15/95

The QS6 MIDI System Exclusive message format is as follows:

F0 System exclusive status

00 00 0E Alesis manufacturer id#

0E QS id#

cc Opcode

dd Data

: :

F7 End-Of-Exclusive

OPCODES:

00-MIDI User Program Dump F0 00 00 0E 0E 00 <program#> <data> F7

<program#>= 0..127 selects individual user programs

<data> is in a packed format in order to optimize data transfer. Eight MIDI bytes are used

to transmit each block of 7 QS6 data bytes. If the 7 data bytes are looked at as one 56-bit

word, the format for transmission is eight 7-bit words beginning with the most significant

bit of the first byte, as follows:

SEVEN QS BYTES:

0: A7 A6 A5 A4 A3 A2 A1 A0

1: B7 B6 B5 B4 B3 B2 B1 B0

2: C7 C6 C5 C4 C3 C2 C1 C0

3: D7 D6 D5 D4 D3 D2 D1 D0

4: E7 E6 E5 E4 E3 E2 E1 E0

5: F7 F6 F5 F4 F3 F2 F1 F0

6: G7 G6 G5 G4 G3 G2 G1 G0

TRANSMITTED AS

0: 0 A6 A5 A4 A3 A2 A1 A0

1: 0 B5 B4 B3 B2 B1 B0 A7

2: 0 C4 C3 C2 C1 C0 B7 B6

3: 0 D3 D2 D1 D0 C7 C6 C5

4: 0 E2 E1 E0 D7 D6 D5 D4

5: 0 F1 F0 E7 E6 E5 E4 E3

6: 0 G0 F7 F6 F5 F4 F3 F2

7: 0 G7 G6 G5 G4 G3 G2 G1

There are 400 data bytes sent for a single program dump, which corresponds to 350

bytes of program data. With the header, the total number of bytes transmitted with a

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 96 97

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Alesis QS7.1 Manuel de service Page 51