Acces I/O products USB-FLEXCOM4 User Manual
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Contents
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Manual USB-FLEXCOM47COM Port CompatibilityThe FT4232H is FTDI’s fifth generation of USB devices. It generates a USB protocol enginewhich controls the physical universal transceiver macro cell interface and handles allaspects of the USB 2.0 high speed interface. It also includes 2K bytes TX & RX data buffersper port.The driver/receiver used (SP491 in non-RS232 modes) is capable of driving extremely longcommunication lines at high baud rates. It can drive up to +60 mA on balanced lines andreceive inputs as low as 200 mV differential signal superimposed on common mode noise of+12 V to -7 V. In case of communication conflict, the driver/receivers feature thermalshutdown. The driver/receiver used in RS232 mode is the ICL3243.Communication ModeThe board supports Half-Duplex communications with a 2-wire cable connection. Half-Duplex allows traffic to travel in both directions, but only one way at a time. RS485communications commonly use the Half-Duplex mode since they share only a single pair ofwires. RS-232 suffers from a maximum usable distance of 50 feet, as only one side of theline is actively driven with a common return. RS-422 and RS-485 are both capable ofoperating without error at up to 4000 feet as both communication lines are actively driveninstead of just one as in RS-232.Half-Duplex mode:RS-485 multi-drop (32 transmitters/receivers allowed on a single twisted pair)Full-Duplex modes:RS-422RS-232Differential communication modes:RS-485RS-422Single-ended communication mode:RS-232 |
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