epos_hardware list_device problem

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Hello everyone,

I am newbie at robotics and i try to move a robot which has MAXON EPOS driver. I try to use epos_hardware package. I connected EPOS driver's RS232 port via FTDİ FT232BM chipset. I command rosrun epos_hardware list_devices it responds

Could not get interface names: Bad Parameter

I try whatever i find loaded FTDI library gave permissions but it doesn't work.

connected port info like that:

crwxrwxrwx 1 root dialout 188, 0 Ara 28 21:28 /dev/ttyUSB0

to connect epos driver where should i look