Communications
USB cables provide RS-422 and RS-485 interface support
Future Technology Devices International (FTDI) has announced the availability of two serial interface converter cables that incorporate transceivers to facilitate connecting RS-422 or RS-485 based peripherals to a PC’s USB port. Using FTDI’s FT232RQ USB to asynchronous serial interface IC, the USB-RS485-WE converter cable includes an RS-485 transceiver while the USB-RS422-WE cable utilises a RS-422 transceiver. The far end of the 1.8m cables are wire ended (no connector).
WithA feature of the FT2232RQ provides a user writeable EEPROM area. This allows the cables USB interface to be customised using FTDI’s MPROG, available from http://www.ftdichip.com/Resources/Utilities.htm. The internal EEPROM can be programmed in-circuit over the USB interface without any additional voltage requirements.
The converter cables are ideal for a broad range of industrial applications such as instrumentation, machine control and data collection.
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