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geekmaster · 03-01-2012, 04:20 PM

The pins in the bottom connector are (from the bottom):

Power Enable (when shorted to GND, turns on power to top connector for LED book light)
GND
RxD
TxD

AFAIK the kindles route the signals so shorting adjacent pins does not hurt. Shorting RxD and TxD is just a loopback connection. Shorting RxD to GND is a "break" signal. Shorting GND to the bottom enable pin enables power to the top slot, which supplies power to the LED book light in the official amazon lighted case.

Some kindle models have a 1K resistor in series with RxD and TxD, which can cause problems if your USB serial adapter supplies too much current through a status LED that pulls up that signal line.

This is documented in other posts.

03-01-2012, 04:20 PM	#18
geekmaster Carpe diem, c'est la vie. Posts: 6,433 Karma: 10773668 Join Date: Nov 2011 Location: Multiverse 6627A Device: K1 to PW3	The pins in the bottom connector are (from the bottom): Power Enable (when shorted to GND, turns on power to top connector for LED book light) GND RxD TxD AFAIK the kindles route the signals so shorting adjacent pins does not hurt. Shorting RxD and TxD is just a loopback connection. Shorting RxD to GND is a "break" signal. Shorting GND to the bottom enable pin enables power to the top slot, which supplies power to the LED book light in the official amazon lighted case. Some kindle models have a 1K resistor in series with RxD and TxD, which can cause problems if your USB serial adapter supplies too much current through a status LED that pulls up that signal line. This is documented in other posts. Last edited by geekmaster; 03-01-2012 at 04:23 PM.