Nmea 0183 Serial Adaptor Problem

[Alpenskipper]

Open OpenPlotter in debug mode and restart the NMEA 0183 multiplexer to see if kplex is reporting errors.

Check your wiring and bauds settings in plotter and OpenPlotter.

all settings 4800,8,N,1

Debug mode gives no messages in command line windows.

Green LED is flashing when receiving data
Red LED is flashing when sending data.

How can I check the raw data that is coming in?

EDIT:

I read the data outgoing from Openplotter on the PC via a terminalprogram:

There are coming "sentences" in on the PC side , but they don't look like NMEA:
4800,8,N,1 Mode ASCII:

[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo??????aYOw[?y??????y??Q???w??<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo??????aYOw[?y??????y??Q???w??<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?y??????y??Q???w???aYOw[?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?y??????y??Q???w???aYOw[?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo??????aYOw[?y??????y??Q???w??<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo?????<\0>[e=?m?y??????y??Q???w??<\0>[e=?m?_????????{?m?y_?y??????y?m?yW?o??????[?m?yo??????aYOw[?y??????y??Q???w??<\0>