Use terminal with 115200 baud 8N1 which is the typical setting for all Marvell ARM SoCs. Connect 3.3V-level TTL serial adapter GND-GND and then try all non-GND pins without voltage level above 3.3V as potential TX from the StorCenter by connecting it to RX of the serial adapter.Measure voltage on all other pins, exclude everything above 3.3V.to USB connector shield which should also be GND. ![]() Find all pins of the this 2x5 pin connector which are directly connected to GND using multimeter and measuring resistance e.g.I doubt the device will have real RS-232, but maybe pinout is similar? The 2x5 pin 2.54mm header suspiciously looks like the standard PC RS-232 motherboard connector.
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