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4-Port RS-422 / 485 USB to Serial Adapter - Coolgear
4 Port Professional RS-232 USB 2.0 to Serial Adapter
UC2324 - 4-Port USB-to -Serial RS-232 Hub
4 Port Professional RS-232 USB 2.0 to Serial Adapter w/Nuts
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4 Port USB to Serial Adapter - USB-B to DB9 RS485 RS422 | Eaton
4 Port USB Type-C To Serial Adapter with Per port LED Rx / TX Indicators
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4-Port USB to RS-232 Hub - UC2324, ATEN Converters | ATEN U.S.A.
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Delock Products 87414 Delock USB 2.0 to 4 x serial adapter
4-Port USB to RS232 Adapter FTDI Cable - Coolgear
FTDI CHIP 4 Port USB to Serial RS232 DB9 Adapter Cable | eBay
Tripp Lite Keyspan High Speed 4 Port USB to DB9 Serial Adapter Hub - serial adapter - USB - RS-232 x 4 - USA-49WG - USB Adapters - CDW.com
StarTech 4-Port USB to Serial Adapter Hub with COM ICUSB2324X
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4-Port USB to Serial RS232 Hub | TRENDnet - TRENDnet TU-S4
Large Selection of USB-RS232 adapters, Easy Installation and Setup of USB RS232 COM ports.
4-Port USB to RS-232 Serial Adapter Hub
