Tool distribution board problem?
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@dc42 It's a good idea!
We can easily do a dummy connector for plug it in the can bus cable as a terminator, in case weren´t present the printhead.
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@marcossf just to be clear, a dummy plug isn't a terminator, it's a bypass for a missing tool.
A bus terminator is a 120 ohm resistor (or two 60 ohm resistors if using split termination) at the very end of the bus. Its purpose is to prevent the signal from being reflected back along the bus when it reaches the end.
The Duet 3 main board has a permanent terminator fitted. All CAN expansion boards except tool boards have two jumpers that can be fitted to enable the termination resistors. The tool distribution board has a single jumper that can be fitted to enable the termination resistor.
The tool distribution board also has a pair of bypass jumpers for each tool board connection.
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@dc42 OK, understood. If we do a connector reachable for the user when no tool is present in the distribution board, in our case acts as bypass for this tool, not as the resistance terminator.
The distribution board will be leaved with the jumpers fitted as we showed in the last photo and cannot be reachable for the user.
The user will be instructed to put the "blank" connector when weren't tool in the 1 and 2 printhead cables, and follow the cable order if empty printhead from last one to the first one.
But in all the test we did without "terminating", all the times could be able to locate the board of the printheads present. Still testing a lot of things.
May I could not to explain properly. I'm sorry.
