Trouble reading E450 meter (L&Gyr)

Hello,
I have a E450 and GXDLMXDirector v8.1.1904.0201. I'm interfacing with the meter using this little device right here : https://www.ebay.com/itm/USB-transfer-MBUS-module-slave-module-communic…
It plugs into the consumer interface at the bottom of the meter, not the optical one.

I create a new device and fill in the info : see image attached. I had unplugged the serial interface this is why it doesn't show, but I had it set to 2400bd, 8 data bits, no parity and one stop bit.

When I try ton connect I get an error shown in the following log file :

GXDLMSDirector 8.1.1904.0201
Log created 17:03:03
17:03:07 Initializing serial connection.
17:03:09 HDLC sending:/?!<CR><LF>
17:03:12 HDLC received:    � 42064414 171687 .   0    �  �m~~������� �@
p S�<LF>
System.Exception: Invalid responce.
à GXDLMSDirector.GXDLMSDevice.InitializeConnection()
à GXDLMSDirector.MainForm.Connect(Object sender, GXAsyncWork work, Object[] parameters)
17:08:50 Initializing serial connection.

Any ideas as to why this happens? When I used a serial sniffer, I figured those weird characters were simply some badly interpreted data. By the way you can see the serial numbers in that string.

Thanks in advance for your help.