This interface useses a XPORT to translate TCP/UDP messages to serial. The DMX magic happens on the serial port behind the XPort on pint 6 (RxD) and Pin 5 (TxD). The XPort in the interface has a web or telnet configuration page - see the manual. If you change the settings so you can speak to the XPort on the serial side with UDP commands you can send the DMX by UDP.
The settings are:
Protocol RS232
Baud Rate: 9600
Flow Control: None
Data Bits: 8
Parity: None
stop Bits: 1
Page: "Connection Settings"
Protocol: UDP
Datagram Type: 01
Accept Incoming: Yes
Local Port: <choose any port over 1000 - i.e. 8899>
Remote Port: <same as Local Port>
Remote Host: <IP-Adress of openhab OR your standart gateway i.e. 192.168.1.1>
Device Address Table: set all to 0
I once implemented my own home automation system and came quite far - but then openhab overtook me. Still you can find some info in the java file of the DMX binding I did using this interface. The protocol commands can be found in the code - I think there is a documentation somewhere in the internet. Most of the commands are 1 capital Letter followed by a number. I think B stands for Blackout etc...
Hope this works.
PS: If you change the settings on the XPort, you won't be able to speak to your interface with a regular DMX software designed to work with the DMX4All Interface. But as you have openhab, you don't need this anymore and you're fine to change to UDP and send the DMX commands yourself.
leutholl