Re: pin-assignment of Zeiss CAN-bus



On Dec 19 2006, 4:06 am, "heini"
<buerg...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Hi everyone,
I am proud user of a Zeiss axiovert 200M. Now I want to add a fast
shutter from an older Zeiss, so I don't have to switch the halogen lamp
on and off all the time.
I have got two shutters 457365 (slow) and 4537370 (fast iris shutter).
I also have the wiring-diagrams and pin-assignments for these two
shutters.
The modern CAN-bus of Zeiss looks like a VGA-connector. Has anyone got
an idea of the pin-assignment here?
thanks, heini

A CAN Bus has 4 lines that are very much like RS485 lines. On some
equipment RS 485 drivers will work with CAN Drivers. I don't know if
that's case for Zeiss. You can safely probe a CAN bus with an
Oscilloscope with .5 meg resistors and a .1 ufd capacitors in series
with the ground and tip of the scope probe and a lot of gain on the
scope.

I have no idea but I expect that the network is two sets of twisted
shielded pair terminated at each end with 75 ohm resistor just a Bosch
designed it. I wouldn't be surprised to see a voltage source or two in
the cable and possibly wiring for an older RS 485 or RS 232 networks as
well. Five pins are all thats needed for CAN so if there are nine I
expect there is something extra in the cable.

Reading and acting on a message form the CAN bus is no small
undertaking without the specifications for the bus and the messages.
Someone could loose themselves in there for months and months.

Gordon

.