Quote:
Originally Posted by dr_g100k
I used UM232R module. USB powered, 3.3V level. |
AFAIK I've understanded EBS, you need a TTL (5V) RS232 Port attached to Kindle side. You cannot attach a true RS232 port (+12VDC, -12VDC) because you can break Kindle internals. And if you've done it, it is practically sure you've broken internal Kindle serial port and the only available step is to soldering into Kindle if MAX232 (or equivalent) is available, but due Kindle board if you do not have an very good soldering station and are a skilled solder man you will definetively break your Kindle.
At the other side you need a RS232 port. If your computer only have USB, then you need an USB-to-RS232 with TTL levels or a USB-to-RS232 and then attach a RS232 (TRUE)-to-TTL RS232, that can be done with a MAX232 or variant.
I do not know if exists USB-to-RS232TTL converters, at work we use some internal boards made by our electronic engineer using FTDI chips and we can select configuration via jumpers and soldering jumpers...