Cannot Read-out 1-Wire Tempsensors and USB Adapter DS9490R

Hello Folks,

i am using a Standard LP (2/32) with Win10 and an 3A Poweradapter.

I want to read out 1-Wire Temp Sensors (DS 18S20), 15 pieces with a maximum length of 20meter cable. I connected the Sensors with all 3 Pins.

As Adapter to PC i am using the Dallas DS9490R USB-Adapter.

Before LP i was using an IGEL 4610 Winestra, a little Stand-alone Windows XP Client (1 GHz CPU, 1GB RAM, 8GB Card as Harddisk).

So, the Sensors, Cable and USB-Adapter are working with the IGEL perfectly, no Latence or ReadoutErrors for nearly 2 Years running 24/7.

But now, As i startet with LP, the USB Adapter (9490) is recognized and installed with no problems.
But i cannot read out all Sensors. Just maximum 3 or 4 at the same time, normaly 1 or 2.

I tried to use it with an Active USB Hub, one with an 1A Poweradapter and one with 2A Poweradapter, but the same Issue.

Does anyone have an idea to solve this, or how to read out the Sensors on an other way (not USB...)?

Thank you for your help and Feedback,

Oliver from germany