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Quad USB to RS232
Converter

(USPS First Class Worldwide Shipping included)




Quad USB to RS232 adapter $29.95
 
Description
     This logic level serial interface is based on the FTDI FT4232H converter and allows direct connection from a PC to an embedded processor with logic level and polarity compatibility, i.e. idle state is 1 and active state is 0.  This is especially useful when debugging serial communications directly from the target processor as well as allowing the elimination of RS232 charge pump and driver circuits where the target serial interface is only used for programming etc, but not intended for regular connection to a PC.
  • Embedded processor logic polarity compatibility:  Idle state is logic high, start bit is logic low (RS232 PC signal idle state is -12V and active state is +12V).
  • The logic voltage level shifting is set by the voltage at VIO (Pin-1) and can range from 1.8V to 5.5V.  Leave the jumper out when using an externally supplied interface voltage.
  • Internal 3.3V (200mA) and 5.0V (500mA) supplies can be used externally and are present at VIO (Pin-1) when the jumper is installed in one of the two positions.
  • The FTDI VCP (Virtual Com Port) or D2XX (Direct Driver) drivers are available from the FTDI website for most operating systems.  The VCP driver makes the serial interface look like a standard COM port and is the first choice for most users.  When it enumerates, the USB driver selects the next free port number which is keyed to the serial number of the FTDI chip and the physical port it was plugged into, to change the port setting to a specific one in Windows, go to the hardware manager and force it to the number desired (Provided the new number is actually a currently free port!).
  • Find the active serial ports with this utility:  Portlist.

Any questions or comments?
This page last updated on April 17, 2012