USB to Serial Adapter Home

USB to Serial Adapters for Mainstream Applications

USB to serial adapters emulate serial standards like RS-232 and RS-422 over the Universal Serial Bus. For many applications the inexpensive DB9 and DB25 devices are quite suitable. Synchrotech recommends Keyspan's USB High Speed Serial Adapter for the best compatibility of all USB based adapters. There are, however, certain serial devices that require true host adapters. For these cases, look for system level bus based host adapters to provide serial I/O. For example, on ExpressCard based notebooks, use our PCIe based ExpressCards.

Keyspan High Speed RS-232 DB9
USB to Serial More Information - View Product Pages Buy Now
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. Data rates up to 230 Kbps. DB-9 Male Connector.
USB-SIO-K03 | Price: $41.00
USB 2.0 to 8 Port Serial
USB 2.0 to 8 Port Serial More Information - View Product Pages Buy Now
USB 2.0 to Serial Adapter 8 Port RS-232 DB9
Provides eight RS-232 male DB9 ports for direct connection to serial devices. Transmit-Receive FIFO at 512 bytes per port with transmission rate up to 230400bps. Win XP/Vista/7 (32/64 bit).
USB-SIO-U620 | Price: $120.00
USB 2.0 RS-232 DB9
USB to Serial More Information - View Product Pages Buy Now
USB to Serial Adapter 1 Port RS-232 DB9, U-224
Inexpensive USB to RS-232 with cross platform capability. Features data rates over 120 Kbps, and a DB-9 Male Connector.
USB-SIO-B01 | Price: $24.99
USB to R-232 Serial
USB 2.0 to Serial Adapter 2 Port RS-232 COM DB9 More Information - View Product Pages Buy Now
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. Windows XP/Vista/7 (32/64 bit) and Mac OS X 10.5 or later.
UUSB-SIO-U-700 | Price: $32.99
Bafo RS-232 DB25
USB to Serial More Information - View Product Pages Buy Now
Bafo USB to Serial Adapter 1 Port RS-232 DB25
Inexpensive USB to RS-232 with cross platform capability. Features data rates over 120 Kbps, and a DB25 Male Connector.
USB-SIO-B02 | Price: 29.00
USB to RS-422/485
USB 2.0 to Serial Adapter RS-422 RS-485 DB9 IU-100 More Information - View Product Pages Buy Now
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. DB-9 connector, with pin-outs defined by standard in use. Rugged metal construction featuring a mounting bracket. Supports Windows XP/Vista/7/8, Mac OS X, Linux and Windows CE.
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 More Information - View Product Pages Buy Now
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. DB-9 connectors, with pin-outs defined by standard in use. Rugged metal construction featuring a mounting bracket. Supports Windows XP/Vista/7/8, Mac OS X, Linux and Windows CE.
USB-SIO-IU-110 | Price: $49.00
USB to RS-422/485
USB 2.0 to Serial Adapter RS-422 RS-485 DB9 4-Port IU-110 More Information - View Product Pages Buy Now
USB 2.0 to Serial Adapter RS-422 RS-485 DB9 2-Port IU-120
USB to 4 port, user selectable RS-422, RS-422 full duplex, and RS-485 serial host adapter. DB-9 connectors, with pin-outs defined by standard in use. Rugged metal construction featuring a mounting bracket. Supports Windows XP/Vista/7/8, Mac OS X, Linux and Windows CE.
USB-SIO-IU-120 | Price: $82.00

USB to Serial Based Networking

Need USB to synchronous/asynchronous serial networking capabilities? The FarSync Flex USB Sync/Async Adapter works with X.21, RS530, V.35, RS449, RS485 and RS232C network interfaces operating at serial line speeds up to 2 Mbits/s. FarSync Flex USB provides as single port and is designed to provide a high performance communications solution for use with TCP/IP and an API for companies who wish to quickly develop their own communications solutions. The API permits HDLC framed and transparent bit stream operation from Linux and Windows.

FarSync Flex FS4100
Farsync Flex More Information - View Product Pages Buy Now
FarSync Flex USB Sync/Async Adapter with Linux and Windows Drivers
Synchronous serial adapter supporting X.21, RS530, V.35, RS449, RS485 and RS232C network interfaces operating at serial line speeds up to 2 Mbits/s. For Linux and Windows. SDK available separately.
F-FS4100 | Price: $720.00

USB to Serial and Parallel Combo

USB to Serial and Parallel adapters emulate standards like RS-232 and IEEE1284 over the Universal Serial Bus. For many applications these inexpensive devices are quite suitable. There are, however, certain serial and parallel devices that require true host adapters.

Valid HTML 4.01 Valid CSS RSS/XML Feed Follow us on Twitter USB, Serial Adapter, RS-232, RS-422