Generic FTDI drivers (e.g., from ftdichip.com) may:
sudo screen /dev/asr9xx_console 9600 cs8 -cstopb -parenb crtscts asr9xxusbconsoledriverszip hot
You may need a free Cisco.com login to download it, but it ensures you aren't downloading malware bundled in a "hot" zip file from an unverified source. How to Install and Connect Once you have the .zip file: Generic FTDI drivers (e