seem to be the only one fiddling with serial at this stage so I will answer myself:

When you guys makes new similar templates. How do you know how to handle the messages that comes back?
It seems like the DCErouter.log is the file to monitor while doing this. Also the Device logfile
tail -f 64_Generic_Serial_Device.log seem to be another to keep an eye on.
I have seen complaints in the device log that 8N1 is not supported, see this complaint also in the Onkyo and since that one is working I guess it's not too relevant?
But what I cannot get my head around is this message that I get:
========== NEW LOG SECTION ==========
1 03/01/10 22:22:29 64 (spawning-device) Starting... 1
1 03/01/10 22:22:29 64 (spawning-device) Found /usr/pluto/bin/Generic_Serial_Device
05 03/01/10 22:22:30.312 Connect() failed, Error Code 111 (Connection refused)) <0xb77e38d0>
05 03/01/10 22:22:31.312 Connect() failed, Error Code 111 (Connection refused)) <0xb77e38d0>
05 03/01/10 22:22:32.312 Connect() failed, Error Code 111 (Connection refused)) <0xb77e38d0>
01 03/01/10 22:22:39.264 Paritybit/Stopbit 8N1 NOT supported. <0xb5fdfb90>
Connection refused, what can cause that?
-johan