YMMV

* your mileage may vary

Saturday, 3 May 2014

Beaglebone Black (BBB) Using the Serial Debug Cable

Don't use the red wire on the BBB!
Plug the cable in to the desktop. 
lsusb to see the device
Bus 002 Device 007: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port

In Putty, (on desktop)
  • Set the connection type to serial
  • Set the connection to /dev/ttyUSB0
  • Set the speed to 115200
  • Set Data bits to 8
  • Set Stop bits to 1
  • Set Parity to None
  • Set Flow Control to None
Turn off the BBB. On J1 of the BBB
  • Connect black wire to pin 1 (nearest to barrel connector)
  • Connect white wire to pin 5
  • Connect green wire to pin 4
  • do not connect red wire
Boot up the BBB and the Putty terminal will show all the boot info.

putty log file

There are four wires: 
red =>power (do not connect), 
black => ground, 
white =>RX into USB port,
green => TX out of the USB port.
The power pin provides the 5V @ 500mA direct from the USB port


The RX/TX pins are 3.3V level (according to Adafruit => I think this is wrong)
Readings from volt meter:
  • White RX (into USB) is 5v
  • Green TX (into BBB) is around 3.6v
Voltage divider needed for safety

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