4 Port USB Type-C To Serial Adapter with Per port LED Rx / TX Indicators
4-Port USB to RS232 Converter DB9 | Black Box
Amazon.com: TECHTOO 4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) : Electronics
StarTech 4-Port USB to Serial Adapter Hub with COM ICUSB2324X
Four-port USB to serial RS232 converter / adapter
4-port USB to Serial RS232 Converter
4-Port USB to RS-232 Serial Adapter Hub
Large Selection of USB-RS232 adapters, Easy Installation and Setup of USB RS232 COM ports.
4-Port USB to RS232 Adapter FTDI Cable - Coolgear
4-Port USB to RS-232 Hub - UC2324, ATEN Converters | ATEN Corporate Headquarters
USB 4-Port Serial Adapter - USB 2.0 to DB-9 Port RS232 with FTDI CHIP - Coolgear