Table des Matières
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❍1-3.Process Patch
+——————————————————————————————————————————————————————————————————————————————+
| Offset
|
|
Address |
|—————————————+————————————————————————————————————————————————————————————————|
|
00 00 | 0aaa aaaa | Process Patch
|
:
| :
|
:
|—————————————+————————————————————————————————————————————————————————————————|
|Total size
| 00 00 10 00
+——————————————————————————————————————————————————————————————————————————————+
❍1-4.Memory Save Request
+——————————————————————————————————————————————————————————————————————————————+
| Offset
|
|
Address |
|—————————————+————————————————————————————————————————————————————————————————|
|
00 00 | 0000 0000 | Memory Save Request
|—————————————+————————————————————————————————————————————————————————————————|
|Total size
| 00 00 00 01
+——————————————————————————————————————————————————————————————————————————————+
* When MC-09 receive Memory Save Request after receiving System parameters, User
parameters or Process Patch parameters, Parameter data is saved to a memory of MC-09.
Description
0 — 127
Description
0
6. Supplementary Material
|
|
■Calculating a checksum of an Exclusive message
|
|
Roland Exclusive messages (RQ1, DT1) are transmitted with a checksum at the end (before
|
F7) to make sure that the message was correctly received. The value of the checksum is
determined by the address and data (or size) of the transmitted Exclusive message.
❍How to calculate the checksum
|
|
(hexadecimal numbers are indicated by "H")
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The checksum is a value derived by adding the address, size, and checksum itself and
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inverting the lower 7 bits.
Here's an example of how the checksum is calculated. We will assume that in the Exclusive
message we are transmitting, the address is aa bb cc ddH and the data or size is ee ffH.
aa + bb + cc + dd + ee + ff = sum
sum ÷ 128 = quotient ... remainder
128 - remainder = checksum
MIDI Implementation
6
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