Our COML 205U is a two-channel PCI low-profile USB serial I/O adapter for the PC and compatibles. It provides two field selectable RS-232/422/485 serial ports supporting data rates up to 460 kbps.
Configure both ports as RS-232 for standard serial COM: port requirements. Choose the RS-422 mode for long-distance device connections up to 4000 ft. where noise immunity and high data integrity are essestial. Select RS-485 and capture data from multiple peripherals in an RS-485 multidrop network. Up to 31 RS-485 devices can be connected to each port to automate your data collection. You can even mix the ports in any of the interface combinations to provide maximum flexibility to your applications.
In borh RS-232 and RS-422 modes, the card works seamlessly with the standard operating system serial driver. In RS-485 mode, our special auto-enable feature allows the RS-485 ports to be viewed by the operating system as a COM: port. This allows the standard COM: driver to be used for RS-485 communications. Our on-board hardware automatically handles the RS-485 driver enable. The UART for the COML 205U is a 1650, and for the 205U-X is a 16950. Both UARTs have 128-byte FIFOs. The COML 205U-X features isochronous communication.