DB-9 connectors, with pin-outs defined by standard in use. USB-SIO-IU-100 | Price: $37.00 USB to RS-422/485 USB 2.0 to Serial Adapter RS-422 RS-485 DB9 2-Port IU-110 USB to 2 port, user selectable RS-422, RS-422 full duplex, and RS-485 serial host adapter. Supports Windows XP/Vista/7/8, Mac OS X, Linux and Windows CE. Rugged metal construction featuring a mounting bracket. DB-9 connector, with pin-outs defined by standard in use. USB-SIO-B02 | Price: 29.00 USB to RS-422/485 USB 2.0 to Serial Adapter RS-422 RS-485 DB9 IU-100 USB to user selectable RS-422, RS-422 full duplex, and RS-485 serial host adapter. Features data rates over 120 Kbps, and a DB25 Male Connector. UUSB-SIO-U-700 | Price: $32.99 Bafo RS-232 DB25 Bafo USB to Serial Adapter 1 Port RS-232 DB25 Inexpensive USB to RS-232 with cross platform capability. Windows XP/Vista/7 (32/64 bit) and Mac OS X 10.5 or later. USB-SIO-B01 | Price: $24.99 USB to R-232 Serial USB 2.0 to Serial Adapter 2 Port RS-232 COM DB9 The cross-platform U-700 USB 2.0 to Serial Adapter 2 Port provides two RS-232 'COM' ports with data transfer rates of up to 230Kbps. Features data rates over 120 Kbps, and a DB-9 Male Connector. USB-SIO-U620 | Price: $120.00 USB 2.0 RS-232 DB9 USB to Serial Adapter 1 Port RS-232 DB9, U-224 Inexpensive USB to RS-232 with cross platform capability. Transmit-Receive FIFO at 512 bytes per port with transmission rate up to 230400bps. USB-SIO-K03 | Price: $41.00 USB 2.0 to 8 Port Serial USB 2.0 to Serial Adapter 8 Port RS-232 DB9 Provides eight RS-232 male DB9 ports for direct connection to serial devices. Keyspan High Speed RS-232 DB9 Keyspan USB to 1 Port Serial Adapter High Speed RS-232 Keyspan's RS-232 adapter offers best in class compatibility and works with multiple operating systems. For example, on ExpressCard based notebooks, use our PCIe based ExpressCards. For these cases, look for system level bus based host adapters to provide serial I/O.
There are, however, certain serial devices that require true host adapters. Synchrotech recommends Keyspan's USB High Speed Serial Adapter for the best compatibility of all USB based adapters. For many applications the inexpensive DB9 and DB25 devices are quite suitable. USB to serial adapters emulate serial standards like RS-232 and RS-422 over the Universal Serial Bus. USB to Serial Adapter Home USB to Serial Adapters for Mainstream Applications
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