Serial Sensor get only read once at boot

Hello,

I am new to Home Assistant and I build a serial sensor, to get data from my Victron SolarCharger by ve.direct usb cable.

My problem is, that I only get one reading at boot. For one time, I got new readings every second, but after a reboot, that stops.

I use Home Assistant OS as a proxmox ve VM.

Can someone give me a tip, what is wrong?

In my sensor.yaml I add this.

  - platform: serial
    name: "Victron_SmartSolar"
    serial_port: /dev/serial/by-id/usb-VictronEnergy_BV_VE_Direct_cable_VE735TSL-if00-port0
    baudrate: 19200
    value_template: "{{ value }}"

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