Bc2000 (for the BCF2000 & BCR2000) group photo

Yahoo Groups archive

Bc2000 (for the BCF2000 & BCR2000)

Index last updated: 2026-04-28 23:16 UTC

Message

Re: Calculate Checksum

2013-07-22 by djheikotnt

--- In bc2000@yahoogroups.com, "Royce" <rpcfender@...> wrote:
>
> Hi
> > # Hall Mode 0-7
> > 
> > $encoder 1
> >    .showvalue on
> >    .mode 1dot
> >    .resolution 24 24 24 24
> >    .default 0
> >    .minmax 0 7
> >    .tx $F0 $41 $10 $00 $18 $12 $40 $01 $30 val $0F $F7
> > 
> > But it doesn't work. i know that the checksum "0F" need to be calculated
> > from 40 01 30 00
> 
> Nearly right
> .tx $F0 $41 $10 $00 $18 $12 $40 $01 $30 val cks-1 cks_start $F7
> In your case...
> .tx $F0 $41 $10 $00 $18 $12 $40 $01 $30 val cks-1 $06 $F7
> 
> $F0 sysex start
> $41 Roland
> $10 device id
> $00 $18 model id
> $12 command - here is the parameter data
> $40 $01 $30 parameter address (should there be 4 bytes here??)
> val parameter value
> cks-1 the checksum result. cks-1 is the calculation that Roland uses
> $06 the start of checksum calc. 
> 
> Roland only uses the address and the value data, not the header, when working out the checksum.
> That is, the checksum calculation starts by adding the bytes from the address bytes (byte 6 - $F0 is byte 0) to the end of the value bytes.
> 
> All the best
> Royce
>




Thank you very much Royce :-D

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.