RE: STG2

["Jan" <jan-at-chocolateworld.be>]

>John wrote,
>>
>>I wiped the HD yesterday, reinstalled RH6.0, installed RTL2.0 then
>installed
>>the May release of EMC - still using the stg2mod.o motion controller.
>There
>>was no difference.  It's actually kind of weird, when I measure DAC0 it
>will
>>creep up slowly (ramping up), but DAC1 and DAC2 will both spike.  In fact,
>no
>>matter which direction button I press, DAC1 would still go positive!?
>
>It seems to me that your encoders are give the wrong signals, start-up the
>stg-soft for encoder input, if you turn now manually in two directions you
>have to see the counts go up and down if this is not the fact , say your
>counts are only get up or down it is normal that the DAC will sent output
in
>one direction.
>
>The spikes could come from the fact that no encoder signals are received by
>EMC.
>This was a problem I had myself. It made my old milling machine act like a
>spitfire... . So if you ask me both problems can be seen as encoder
>problems. EMC is a closed loop system with the STG-Board.
>
>There is also a utility in the plat/linux/bin directory called stg2diag
that
>captures the
>encoder data and shows it, when encoder impulses are received to fast it
>will generate a CR so you can closely examine.
>With this utility I saw that my encodersignal was flipping between 1 and
>env. 65000 and belief me or not tweaking the bios solved the problem.
>
>>(Another weird thing is that if you change the settings on one axis, it
>seems
>>to change it for all axes.)  I would suspect the board, but there are
>>separate opamps for 0&1, 2&3, etc.  If 0 works, why not 1?  Plus I've been
>>able to manually set voltages on it.  I think something may be getting put
>>together (the way the base address is appended to the DAC and the counts)
>>wrong when it writes to the DAC.
>
>Try to run the board on a different base-address?
>
>>-John
>>
>Jan.
>
>