MIDI Gateway does not read the Note correct

I have sent a loop of Midi Notes once to the Internal Gateway of our TI, there i could see the correct String.

Then I have sent the same String to the Midi Gateway and it saw only one byte...

The Transmitter was a PC with a M-Audio MIDISport Interface. Perhaps it has something to do with the MIDI Protocol Specifications, but I'm not that familiar with Midi.

I would be very thankful for some Ideas to find the problem.

Here a picture of the logs.