Quote:
Originally Posted by dram
I'm using this converter: http://www.tiaowiki.com/w/TIAO_USB_M...r's_Manual
TTL level selector is in correct position. I use pins 1,2 and 12 on TTL connector. I've tried to swap Rx and Tx wires just to test it. Nothing happened. Absolutely same setup was used on the same computer with the same operating system before executing 'eraseall' command. After that I get absolutely nothing on serial port. I still use same serial port settings - 115200 8N1. |
The device at that link describes itself as 3.3v operation, which is NOT compatible with the 1.8v TTL used in (all but the oldest) kindle models. You need a level shifter such as shown in my
Kindle serial adapter level shifter circuit thread, or you need a serial adapter directly supports 1.8v TTL serial.
Also, the device at your link shows pads for (and describes usage of) RX and TX LEDs. As I mentioned in my "level shifter" thread (link provided above), the kindle TxD cannot sink enough current to light an LED, and cannot pull the logic level down to a 1.8v TTL zero with an LED in that part of the circuit. I had to remove the LED and pull that line up with an appropriate resistor. If your adapter contains such LEDs (as described at your link), you will almost certainly have the same problem.
Also, as I discovered on some kindle models, the GND pin on the serial connection is inadequate, and I was able to get by without part of the level shifter circuit if I used a better GND point in the kindle (such as an RF or USB shield).
EDIT: This page confirms that the device at your link has a "3.3v to 5v TTL serial link", which is NOT compatible with 1.8v kindle serial TTL, unless you convert the TTL levels:
http://www.diygadget.com/tiao-usb-mu...2c-serial.html