Signals

Octobus is the 40pin ribbon wire cable which connects the tentacles.

Octobus Pin	signal	FUT_I2C	FUT_UART	FUT_ONEWIRE	Comment
5	SIGNAL_TRIGGER1	trigger	trigger	trigger	logic analyzer, measures delays
7	GND
9	SIGNAL_TRIGGER2	trigger	trigger	trigger	logic analyzer, measures delays
11	GND
13	SIGNAL_DATA1	SCL	TX	data
15	GND
17	SIGNAL_DATA2	SDA	RX
19	GND

All signals are 3.3V.

Why are the SIGNAL_DATA1/2 lines shared for different protocols? The current tentacles only provide limited relays, so only a few data lines may be controlled.