Roland VS-1880 Manual De Usuario página 126

Aplicación MIDI
16)1258
16) 78 ... 10
16) 4 ... 14
0 ... 4
0 = 00H, 4 = 04H, 14 = 0EH, 10 = 0AH According to the table.
So it is 00 04 0E 0AH.
GExample 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
IMIDI
Machine Control
Information Field / Response Reference
GCommands Recognized
Command
01H STOP
02H PLAY
03H DEFERRED PLAY
04H FAST FORWARD
05H REWIND
06H RECORD STROBE
07H RECORD EXIT
0DH MMC RESET
40H WRITE
41H MASKED WRITE
44H 00H LOCATE I/F
44H 01H LOCATE TARGET
4CH MOVE
GCommands Transmitted
Command
01H STOP
03H DEFERRED PLAY
06H RECORD STROBE
07H RECORD EXIT
0DH MMC RESET
44H 01H LOCATE TARGET
GValid Information Fields / Response
Information Field Interpret
01H SELECTED TIME CODE Current Time
08H GP0 / LOCATE POINT Locator 1
09H GP1 Locator 2
0AH GP2 Locator 3
0BH GP3 Locator 4
0CH GP4 Locator 5
0DH GP5 Locator 6
0EH GP6 Locator 7
0FH GP7 Locator 8
4FH TRACK RECORD READY Track Status
126
(MMC) Command,
Action
STOP
PLAY
PLAY
FF
REW
REC / PUNCH IN
PUNCH OUT
RESET
Write to Information Fields
Set Track Status Information Fields
LOCATE (Read Locator)
LOCATE (Designated Time)
Move between Information fields
Action
STOP
PLAY
REC / PUNCH IN
PUNCH OUT
RESET
LOCATE
Valid Commands
MOVE(FROM)
MOVE(FROM), MOVE(TO), WRITE
MOVE(FROM), MOVE(TO), WRITE
MOVE(FROM), MOVE(TO), WRITE
MOVE(FROM), MOVE(TO), WRITE
MOVE(FROM), MOVE(TO), WRITE
MOVE(FROM), MOVE(TO), WRITE
MOVE(FROM), MOVE(TO), WRITE
MOVE(FROM), MOVE(TO), WRITE
MASKED WRITE, WRITE