Problem with OneWire on Raspberry

Hi,

I’m using OpenHab 1.71 on a Raspberry with Telldus. That works fine.
I’m using a second Raspberry with Owserver.

pi@onewire ~ $ netstat -a | grep 4304
tcp 0 0 onewire:4304 : LISTEN
tcp 0 0 onewire:4304 OPEnhab:48311 ESTABLISHED

I can read temperature value with a DS18B20 direct connected on GPIO :

pi@onewire / $ cat /sys/bus/w1/devices/28-00000464037f/w1_slave

I try to connect DS9097 serial adapter with USB serial on Raspi. No success.

Thank you for your help.