Interface Cards
StarTech.com USB to Serial Hub - 16 Port - COM Port Retention - Rack Mount and Daisy Chainable - USB to RS232 Hub
Gain 16 RS232 serial port interfaces through a single USB port Connect multiple hubs together through daisy chain functionality 921.6Kbps baud per port 256-byte transmit, 128-byte receive FIFO Rack-mountable design
https://www.bizrate.co.uk/iocontrollers/startech-com-usb-to-serial-hub-oid7228831452.html
