FarSync Flex USB Sync/Async Adapter with Linux and Windows Drivers
Now with RS485 support on new units and software upgrades for existing FarSync Flex! FarSite announces the FarSync Flex, the worlds first USB Synchronous line adapter. FarSite have developed a USB connected 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. The device is believed to be the only USB Synchronous Serial line adapter available. No external power supply is required as the device is powered from the USB connection. USB 2.0 and older USB 1.1 host interfaces are supported.
FarSync Flex - Key Features: X.21, RS530, V.35, RS449, RS485, and RS232C network interfaces, drivers for Linux and Windows, NDIS and SDCI Windows API, Raw sockets Linux API, TCP/IP over PPP, USB line powered, Toolkit available for using the API, Line signal modes: NRZ, NRZI, FM0 and FM1, Selectable synchronous or asynchronous, 2 Mbits/s, internal and external clocking, USB 2.0 and 1.1.
See FarSite's W3 Page or PDF datasheet for more information and full features/specifications for this device.
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| Part Number and Description | Price | Add to Cart |
| F-FS4100 FarSync Flex USB Sync/Async Adapter with Linux and Windows Drivers | $720.00 | |
| OPTIONAL ACCESSORIES | ||
| F-FS9610 FarSync SDK (Software Developers Toolkit) with Card API's for Linux and Windows | $360.00 | ![]() |
| AVAILABLE CABLES | ||
| F-FS6011-KCR1 Single RS232C (v.24, X.21bis) and RS530 (EIA530) cable 1.5M | $54.00 | |
| F-FS6062-UCX1 Single X.21 (V.11, RS422) cable 1.5M | $54.00 | |
| F-FS6063-UCV1 Single V.35 cable 1.5M | $68.00 | |
| F-FS6019-KC449 Single RS449 cable 1.5M | $68.00 | |
| F-FS6016-KCR-MON Monitor Cable RS232C (v.24, X.21bis) with DB25M to DB25F passthrough 1.5M | $133.00 | |
| F-FS6017-KCX-MON Monitor Cable X.21 (V.11, RS422) with DB15M to DB15F passthrough 1.5M | $133.00 | |
Features and Specifications

- Features
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- FarSite W3 Page
- FarSite PDF datasheet
- USB Bus powered
- USB 2.0 and 1.1 compliant
- External and adapter generated clocks handling
- 1 communication port with ESD protection circuitry
- API for HDLC frame and transparent raw bitstream modes
- Wide speed range - up to 2 Mbits/s synchronous full duplex
- Sync support on X.21, V.35, RS232C, EIA530, RS422, RS485, and RS449 WAN interfaces
- SDK - optional Developers Toolkit - includes API documentation, utility applications, sample applications and source code
- Supported on Linux, Windows XP, Vista, Server 2003, Server 2008
- Can link to the PCs TCP/IP protocol stack
- NRZ, NRZI, FM0 and FM1 signaling
- CE and FCC class B approval
- Upgradeable firmware
- Warranty Information
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- FarSync five year limited warranty
Support
FarSync W3 Page
Data Sheet
FarSite Cable Compatibility Tables, Diagrams and Adapter Jumper Settings
FarSite direct support page this device
Status of FarSync products operation on Vista- FarSite has a press release regarding that status of their product line with Vista.



