[[Image(wiki:construction_guide:communication_cable.jpg)]]


= Communication Cable =

The Communicatin Cable is used with the [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/29/Serial-Pi-RS232-Interface RS232-Adapter] that is mounted on the Raspberrys GPIO.

  - cut the micro USB cable to fit the length, remove the cable coating 3 cm before the open end. Since this cable serves just for power supply, we just use the red (+5V) and the black (GND) cable, cut the remaining two other away
  - cut 3 cables to length, red (12V), black (GND) and yellow (5V)
  - cut the RJ45 cable to length, remove the cable coating 3 cm before the open end, cut away the cables for RJ45-Pin's 2,3 
  - connect RJ45-Pin5 (usually blue) with Pin 2 of the Female Sub-D plug
  - connect RJ45-Pin6 (usually white-green) with Pin3 of the Female Sub-D plug
  - connect RJ45-Pin8 with Pin5 of the Female Sub-D plug
  - solder RJ45-Pin's 4,7 with the black cable of the micro USB plug and the other black cable (GND), use 		shrinkable tubing for electrical isolation
  - solder RJ45-Pin1 with the red cable (12V), use shrinkable tubing for electrical isolation 
  - solder the third coloured cable (5V) with the red cable from the micro usb plug, use shrinkable tubing for electrical isolation