That is correct. Normally, modules that don't use +5v don't even connect
anything to those pins on their cable. Its just totally unused. They all
use the +-12v stuff though, and GND of course. Later
KRIS

> -----Original Message-----
> Great Kris, thanx for the help, so if I understand you
> right... using the
> converter I can plug in both 12v modules and 5v modules on the same
> busboard, right
>
>
> ----- Original Message -----
> > The bus board looks like this
> >
> > pin 1: -12V
> > pin 2: GND
> > pin 3: GND
> > pin 4: GND
> > pin 5: +12v
> > pin 6: +5v
> > pin 7: Bus CV
> > pin 8: Bus Gate
> >
> > Normally, the power supply ONLY supplies the first and
> fifth pins (as well
> > as the three ground pin sets) and nothing is put on pin 6,
> so normally
> there
> > is no 5v supply.
> >
> > When you put a 5v converter on the bus, what it does is this:
> >
> > pin 1: -12V
> > pin 2: GND
> > pin 3: GND
> > pin 4: GND +---------------------------+
> > pin 5: +12v >>>>---| 5v regulator converts 12v |
> > pin 6: +5v <<<<---| to 5v and puts back on bus|
> > pin 7: Bus CV +---------------------------+
> > pin 8: Bus Gate
> >
> > (sorry for the ascii art - look at it with a proportional
> font and it
> should
> > be OK)
> >
> > so all the guts needed to generate 5v from +12v are on the
> little adapter
> > (made up of an LM7805 3-pin chip like THIS:
> >
> > http://www.hep.upenn.edu/SNO/daq/parts/lm7815.pdf
> >
> > basically it takes +12v OFF of the bus (taps into it NOT removes it
> > entirely, the +12v is still there, but the +5v adapter uses
> some of its
> > current to 'MAKE' +5v) and then it puts the appropriately
> regulated +5v
> BACK
> > ONTO the bus, so in the end, you have all three voltage
> sources on the
> bus.

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