Roland VS-1824 Owner's Manual download pdf (Page 126)

126

MIDI Implementation

<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 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

●Commands 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 fields

●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

Information Field Interpret 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

1 2 ... 121 122 123 124 125 126 127 128 129 130 131 ... 139 140

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Roland VS-1824 Owner's Manual Page 126

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