USB-COMi USB to RS485 Serial Converter
Allows easy serial port expansion without requiring IRQ, DMA, or I/O port resources
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The USB-COMi is a USB to RS485 serial converter. It allows easy serial port expansion without requiring IRQ, DMA, or I/O port resources. The converter allows the user to easily and economically connect RS485 devices to a host using USB. The RS485 communications standard is used by DGH sensor based data acquisition modules and many industrial control devices.
The converter is based on a single chip USB UART for transferring serial data over the Universal Serial Bus without the need for card-slots. The converter has an internal 128 byte transmit buffer FIFO and a 384 byte receive buffer FIFO. It supports baud rates of up to 230K. External power is not required since USB-COMi takes its power from the bus. Connection to USB is via a 3-foot detachable cable. Connection to RS485 is thru the converters DB-9 male connector.
The converter can interface DGH RS485 modules to a host using a USB connection. When using the USB-COMi with a DGH module or any RS485 device that requires wiring, DGH recommends its’ CA-3 cable. The CA-3 is a 3-foot serial cable with a female DB-9 connector and tinned wires ready for connection to RS485.
• Adds high speed RS-485 port via USB connection
• 384 byte receive buffer
• 128 byte transmit buffer for high data throughput
• Data rates: 300 bps to 230K bps
• Serial connector: DB-9
• Easy connection to DGH modules, industrial control devices
• Bus-powered, no external powersupply needed
