The second part of this project is to make a remote serial connection. The CP2102 USB-to-SERIAL-Converter is used to connect to the target. The software connection is done with ssh from the work station to the Raspi and with picocom from the Raspi to the target. I wrote a simple shell script to start the communication.
I want to have fixed target names for the targets. This can be done with udev-rules. Unfortunately, all the CP2102 have the same serial ID. But with the "USBXpress Driver Customization Utility" I was able to assign new serial IDs to the adapters. The Link to the software and the udev-rule can be found in the zip-file Remote_Serial_Connection.