. On these devices, the physical USB-A port is actually a serial interface compliant with the TIA/EIA-232F standard, necessitating a specific virtual COM port driver to communicate with a PC. Driver Package Overview
The ASR 900 series often has both an RJ-45 Console port and a USB Console port. asr9xxusbconsoledriverszip
Those generic drivers almost always work and are more up‑to‑date. . On these devices