Thank you for your ideas.
I am sorry this is in the wrong place. I intended it to go in the electrical section, but I got sidetracked looking at CAN, then forgot to go up one level before posting.
We are making a tester that our mechanical guys can use during the proto type design phase. They often want to run a motor to test some mechanism and have not had a good way to do that. Typically they would just connect it to the battery, but that gives them a false sense of power that is not really available when being controlled by the robot, because the battery is not very current limited. Or we would connect it to a control system, which is not very convenient.
The circuit is this device:
http://gadgetgangster.com/find-a-pro...projectnum=206
On a scope the signal looks just like the output from an IFI RC controller except for the voltage. With an 8 volt power supply the open circuit voltage is 8 volts, but connected to a victor it drops to 1 volt.
The Jaguar schematic shows an input to an optical isolator, which would be easy to interface to like Alan said using a series resistor. I would like to be able to use either a Jaguar or a Victor,
I would still like to find a schematic diagram for a Victor 884.
Thanks.
-Hugh