[amnat]

Ups - tut mir leid, daß Dich das alles verwirrt.

Nun habe ich nochmals geyahood und fand bei solchen Adaptern
 D.Module FAQs:

Problems with USB-RS232 adapter

Since newer notebook computers do no longer provide the legacy RS232 port, you must use a USB-RS232 converter to communicate with a D.Module in Setup Mode. Many of the cheap adapters however have implemented flow control erronously: After receiving an Xon, these adapters repeat the entire last block instead of proceeding with the current character. This causes Intel-Hex format errors during program uploads to the D.Module Flash Memory.

Fortunately there are several converter chips available which handle flow control correctly. A known good device for example is the Silicon Laboratories CP2103. You may use their CP2103EK evaluation board (EUR30..50).

The default is 9600 baud, 8 data bits, no parity, 1 stop bit, Xon/Xoff Software Flow Control.