Roland VS-1680 User Manual download pdf (Page 56)

❍ Format 2 - LOCATE[TARGET]

Status Data Bytes Status

F0H 7FH,Dev,06H,44H,06H,01H,hrH,mnH,scH,frH,ffH F7H

Byte Description

F0H Status of System Exclusive Message

7FH Universal System Exclusive Message Realtime Header

Dev Device ID (or 7FH)

06H MMC Command Message

44H LOCATE(MCP)

06H Number of Bytes

01H “TARGET” sub command

hrH, mnH, scH, frH, ffH Standard Time with Sub Frame

F7H EOX (End of System Exclusive Message)

If the device ID on the message was as same as that of the receiving device or 7FH, the VS-

1680 locates the specified time location received from the command.

If the efficient locate switch [LOC?] or Marker switch [PREVIOUS][NEXT] is pressed, the

VS-1680 transmits as the device ID 7FH.

● MOVE

Status Data Bytes Status

F0H 7FH,Dev,06H,4CH,02H,ddH,ssH F7H

Byte Description

F0H Status of System Exclusive Message

7FH Universal System Exclusive Message Realtime Header

Dev Device ID (or 7FH)

06H MMC Command Message

4CH MOVE

02H Number of Bytes

ddH Name of the Efficient Destination Information Field

(08H,09H,0AH,0BH,0CH,0DH,0EH,0FH)

ssH Name of the Efficient Source Information Field (01H)

F7H EOX (End of System Exclusive Message)

If the device ID on the message was as same as that of the receiving device or 7FH, the VS-

1680 transfers the data on the selected source information field to the destination

Information Field, if the name of both information fields is efficient. The VS-1680 does not

transmit the message.

● The efficient Information Field

The followings are the efficient Information Field on the VS-1680.

The name of the efficient destination Information Field :

01H SELECTED TIME CODE

08H GP0 / LOCATE POINT

09H GP1

0AH GP2

0BH GP3

0CH GP4

0DH GP5

0EH GP6

0FH GP7

4FH TRACK RECORD READY

4. 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.

+——————+——————++——————+——————++——————+——————++——————+——————+

| 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 |

+——————+——————++——————+——————++——————+——————++——————+——————+

* 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 expressing two 7-bit bytes would indicate a value of aa x 128 + bb.

* In the case of values which have a ± sign, 00H = -64, 40H = ±0, and 7FH = +63, so that

the decimal expression would be 64 less than the value given in the above chart. In the

case of two types, 00 00H = -8192, 40 00H = ±0, and 7F 7FH = +8191.

* Data marked “nibbled” is expressed in hexadecimal in 4-bit units. A value expressed as

a 2-byte nibble 0a 0bH has the value of a x 16 + b.

<Ex.1> What is 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 table.

So ((10 x 16 + 3) x 16 + 9) x 16 + 13 = 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 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 Implementation

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