Sys ex. assign items, Specifying the checksum, Checksum types – Roland PCR-80 User Manual
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Convenient functions
Sys Ex. ASSIGN items
■
Specifying the checksum
The PCR-30/50/80 can automatically calculate the checksum of a system exclusive message and
embed it in the message. In order to use this function, you must use the following procedure to
specify the starting location from which the checksum is calculated, and the location at which the
checksum is inserted. You can also select the type of checksum.
For an actual example, please read the Sys Ex.ASSIGN section
1. Press the
[CHECKSUM]
key before you input the byte at which checksum calculation should begin.
fig.css
The display will indicate “CSS” (Checksum Start).
If you press the
[CHECKSUM]
key once again, “CSS” (Checksum
Start) will be cancelled.
2. Press the
[ENTER]
button.
3. Continue inputting data.
4. Press the
[CHECKSUM]
key at the location where the checksum should be inserted.
fig.cs1
The display will indicate “CS1” (Checksum type 1).
5. Press the
[ENTER]
button.
Checksum types
There are two types of checksum, as follows.
Switching the type
If you want to switch to
type 2
,
press the
[2]
key after you press
[CHECKSUM]
in step 4. To switch
back to
type 1
, press the
[1]
key.
1
CHECKSUM
TYPE 1
This is the method used by Roland and most other
manufacturers
2
CHECKSUM
TYPE 2
Select this if the method other than type 1 is used
[2]
[CHECKSUM]
[1]
*1
[CHECKSUM]