Cannot get my Waveshare USB to RS485 working.

[DonatPlayZ]

Hello, i need help.
i try to get my Waveshare USB to RS485 working with mbusd.

my Setup:
RPI 3 B with DietPi install (Loxberry)

Mbusd V0.5.2

My device show as :ttyACM0

udevadm info /dev/ttyACM0 gives:
P: /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/tty/ttyACM0 M: ttyACM0 R: 0 U: tty D: c 166:0 N: ttyACM0 L: 0 S: serial/by-path/platform-3f980000.usb-usb-0:1.2:1.0 S: serial/by-id/usb-1a86_USB_Single_Serial_586D028735-if00 E: DEVPATH=/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/tty/ttyACM0 E: DEVNAME=/dev/ttyACM0 E: MAJOR=166 E: MINOR=0 E: SUBSYSTEM=tty E: USEC_INITIALIZED=261805644 E: ID_BUS=usb E: ID_MODEL=USB_Single_Serial E: ID_MODEL_ENC=USB\x20Single\x20Serial E: ID_MODEL_ID=55d3 E: ID_SERIAL=1a86_USB_Single_Serial_586D028735 E: ID_SERIAL_SHORT=586D028735 E: ID_VENDOR=1a86 E: ID_VENDOR_ENC=1a86 E: ID_VENDOR_ID=1a86 E: ID_REVISION=0445 E: ID_TYPE=generic E: ID_USB_MODEL=USB_Single_Serial E: ID_USB_MODEL_ENC=USB\x20Single\x20Serial E: ID_USB_MODEL_ID=55d3 E: ID_USB_SERIAL=1a86_USB_Single_Serial_586D028735 E: ID_USB_SERIAL_SHORT=586D028735 E: ID_USB_VENDOR=1a86 E: ID_USB_VENDOR_ENC=1a86 E: ID_USB_VENDOR_ID=1a86 E: ID_USB_REVISION=0445 E: ID_USB_TYPE=generic E: ID_USB_INTERFACES=:020201:0a0000: E: ID_USB_INTERFACE_NUM=00 E: ID_USB_DRIVER=cdc_acm E: ID_USB_CLASS_FROM_DATABASE=Communications E: ID_VENDOR_FROM_DATABASE=QinHeng Electronics E: ID_PATH=platform-3f980000.usb-usb-0:1.2:1.0 E: ID_PATH_TAG=platform-3f980000_usb-usb-0_1_2_1_0 E: ID_MM_CANDIDATE=1 E: DEVLINKS=/dev/serial/by-path/platform-3f980000.usb-usb-0:1.2:1.0 /dev/serial/by-id/usb-1a86_USB_Single_Serial_586D028735-if00 E: TAGS=:systemd: E: CURRENT_TAGS=:systemd:

Am i missing some drivers?

I looked arround a bit in the Issue Tab on Github and saw that a other user have the same USB as me but it shows as ttyUSB0 on him.

I tried the following settings:

Speed: 9600, 19200,
Serial Port mode, 8n1, 8E1

I installed it multiple Times.

Alway stuck on:
tty: trying to open /dev/ttyACM0 (speed 19200 mode E81)

Can somebody help me? i really need the Modbus device!