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Wed Aug 17 19:08:56 EDT 2016

Remote node wire interface

Using standard CAT5 cable.  Same as 

- RX
- TX
- 5V
- GND

Should make it harmless if master or slave side of these gets plugged
into an ethernet port.

Serial signaling is a MIDI style current loop.

Positive voltage of inbound data can be used as reset signal.  Use a
capacitor to reduce noise level, and a resistor to dampen LC
resonannces.

Protocol: low baud rate after bringup.  Standard Staapl protocol.  Do
not overwrite bootloader.  Use trampoline loader if bootloader upgrade
is necessary.

Reset switches to low baud rate, then up baud rate through commands.

Make it compatible with MIDI (e.g. make the reset removable, or
disable it in firmware).



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