[RESOLVED] LattePanda Alpha RS232 and Linux

I am trying to use the RS232 interface on my LattePanda Alpha (Arch Linux installed).
The command

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sudo setserial -g /dev/ttyS* shows

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/dev/ttyS0, UART: 16550A, Port: 0x0000, IRQ: 20 /dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3 /dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4 /dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3 I guess that /dev/ttyS0 is the correct interface. Unfortunally no communication is possible using this device. I also checked /dev/ttyS1, /dev/ttyS2 and /dev/ttyS3. But nothing works...
Anyone has any experience using the RS232 on the Alpha?