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Page last modified 10:30, 25 Apr 2011 by stephan
 
 
 

USB-RS232 Virtual COM Port Adapter

From $1

    USB-RS232-Adapter_3d_900.jpg

    Overview

    With this adapter you can easily add a serial port to your embedded system, without needing a physical COM port on on your host.

    The adapter interfaces to any 3.3V LVTTL/CMOS logic and adds an additional virtual COM port to your Windows/Linux/Mac host.

    USB-RS232-ADP Block Diagram.jpg

    Features

    • SiLabs CP2102 USB to UART Bridge
      • USB 2.0 compliant, full-speed (12 Mbps)
      • 1024 Bytes of EEPROM
      • Baud Rates: 300 bps to 1 Mbps
      • User-programmable custom Baud rates
      • Industrial temp –40 to +85 °C
    • Drivers available for
      • Windows 2000/XP/2003/Vista
      • Windows 7
      • Windows CE
      • Mac OSX
      • Linux (2.6.x and 2.4.36)
    • 3.3V CMOS/LVTTL compatible I/Os
    • No power supply required
    • Can supply 3.3V to target system
    • Connection through cables or BTB connector
    • Standard USB-B connector to host side
    • Schematics supplied

    Pinout

    X101 (Cable to Board)

    Pin
    Cable Color
    Signal
    Direction
    1 magenta TXD OUT / from Host
    2 blue RXD IN / to Host
    3 green DTR OUT / from Host
    4 yellow DSR IN / to Host
    5 orange RTS OUT / from Host
    6 red CTS IN / to Host
    7 brown 3.3V Output
    (only for reference, do not draw high current!)
    8 black GND -

    Note that RXD/TXD is named as seen from the UART bridge / the host! Therefore you need to crosswire your systems RXD with the adapters TXD and vice versa!

    X102 (Board to Board)

    Pin
    Signal
    Direction
    1 DSR IN / to Host
    2 DTR OUT / from Host
    3 RXD IN / to Host
    4 TXD OUT / from Host
    5 CTS IN / to Host
    6 RTS OUT / from Host
    7 SUSPEND# IN / to UART bridge
    8 RST# IN / to UART bridge
    9 RI IN / to Host
    10 DCD IN / to Host
    11 3.3V Output  (<100mA!)
    12 GND -
    13 5V Output (dirctly connected to USB port)
    14 GND -

    Note that RXD/TXD is named as seen from the UART bridge / the host! Therefore you need to crosswire your systems RXD with the adapters TXD and vice versa!

    Power Supply

    The adapter is USB-powered and includes an on-chip 5V to 3.3V voltage regulator.

    You do not need to supply any voltage to the adapter from the target system. It's even possible to supply 3.3 (100mA max.) to your target system.

    If you draw power from the 3.3V regulator, note that a maximum of 100mA can be drawn. Additionally you should mention this in the USB max power and power attributes descriptor. See SiLabs application note “AN144: CP210x Customization Guide” for information on how to customize USB descriptors for the CP2102.

    See CP2102 dataheet, chapter 9 for more informations about the integrated voltage regulator.

    FileSizeDateAttached by 
     cp2102.pdf
    CP2102 Datasheet
    212.53 kB10:19, 1 Oct 2009stephanActions
     USB-RS232-Adapter Schematics.pdf
    USB-RS232 Virtual Adapter Schematics
    45.6 kB09:52, 1 Oct 2009stephanActions
     USB-RS232-Adapter_3d_900.jpg
    USB-RS232 Virtual COM Port Adapter
    135.33 kB09:48, 1 Oct 2009stephanActions
     USB-RS232-Adapter_top_1000.jpg
    USB-RS232 Virtual COM Port Adapter
    135.54 kB09:59, 1 Oct 2009stephanActions
     USB-RS232-ADP Block Diagram.jpg
    RS232-USB-Adapter Block Diagram
    55.54 kB00:03, 9 Oct 2009stephanActions
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    One more solution for serial port emulation Virtual COM port driver - https://www.eltima.com/products/virtual-com-port/


    Creates virtual serial port pairs and connected them via null modem emulation. edited 11:56, 27 Mar 2017
    Posted 11:50, 27 Mar 2017
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