Doepfer

Hi Tim,

many thanks for the information. 

best regards,

heinz


 

--- In Doepfer_a100@yahoogroups.com, "Tim Stinchcombe" <timothy@t...>
wrote:
> 
> Hi Heinz,
> 
> > i have a question regarding the A-185 module (bus access). what
> > exactly must i do to get it into 'read only' mode? 
> > according to the manual it depends on a jumper, but the module 
> sports
> > two jumpers and there are no detailed instructions as to how to
> > proceed (i'm unfortunately completely unknowledgeable w.r.t. 
> electronics).
> > i want to mount the module in a frame that already HAS one A-185
> > mounted in it (i want additional CV and gate outputs on that frame)
> > and apparently this doesn't work when both are in read/write mode. 
> 
> The manual does seem a little confusing, but I think most of the 
> information is there. Each section of the 185 (one for 'CV', the 
> other for 'gate') consists of a 'buffer' (or 'refresh amplifier' in 
> the manual) connected between the 'in' and 'out'. The jumpers control 
> whether the internal bus bar is connected to the in or out. In the 
> factory setting (with the jumper in the position of the thick line on 
> the PCB), the system bus is connected to the output, as Fig 1 shows. 
> Hence feed CV and gate signals from the 'master' to the inputs: this 
> then goes to the bus bar to which the A-185 is connected, *and also* 
> to the output sockets, so another A-185 on another bus bar can 
> be 'daisy-chained', as Fig 2 shows.
> 
> If you swap the jumpers to the other position (for 'read mode'), the 
> system bus is connected to the inputs of the buffers, and hence the 
> buffered signals are avaliable at the outputs, this is Fig 3 (and 
> note that the diagram is a little incomplete: the input now *is* the 
> system bus, and so the statement immediately above it isn't correct!).
> 
> If you are solely using Doepfer modules, there should be no need for 
> the read mode, as the manual says, as if you think you need to read 
> what is on the bus, you should be able to take it from what put in 
> there (either an A-185 or A-190, as Fig 2 shows). However if you have 
> a different module writing signals to the bus, and that is why you 
> need to read it using an A-185, then Doepfer have taken the view that 
> you know what you are doing, hence the "won't go into any more detail 
> here" statement (which is probably not unreasonable in my view!).
> 
> And I hope this doesn't make things more confusing!
> 
> Tim