Using the canfox USB/CAN interface

**Describe the bug**
This is not really a bug, more a question.

I'm trying to use a canfox usb/can interface https://www.ifm.com/fr/en/product/EC2112
I tried using bustype "serial", and "slcan" to no avail.

Am I missing something or is this hardware not supported?

```python
import canopen
import time

network = canopen.Network()

node = canopen.RemoteNode(32, 'DTM428.eds')
network.add_node(node)

network.connect(bustype='serial', channel="COM10", bitrate=125000)

device_name = node.sdo['Manufacturer device name'].raw
print(device_name)
network.sync.stop()
network.disconnect()
```

```
Traceback (most recent call last):
File "c:\rfid\main.py", line 28, in
device_name = node.sdo['Manufacturer device name'].raw
File "c:\rfid\venv\lib\site-packages\canopen\sdo\base.py", line 44, in __getitem__
entry = self.od[index]
File "c:\rfid\venv\lib\site-packages\canopen\objectdictionary\__init__.py", line 64, in __getitem__
raise KeyError("%s was not found in Object Dictionary" % name)
KeyError: 'Manufacturer device name was not found in Object Dictionary'
```