File: README.rs232

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This info was obtained from:
  http://www.aggsoft.com/rs232-pinout-cable/pinout-and-signal.htm

Serial (RS232) port interface pinout and signals

DB-9  DB-25  Signal Direction Desc

  1     8     DCD   <<--      Data Carrier Detect (Modem connected to another)
  2     3     RxD   <<--      Receives bytes into PC
  3     2     TxD   -->>      Transmits bytes out of PC
  4     20    DTR   -->>      Data Terminal Ready (I'm ready to communicate)
  5     7     GND   n/a       Signal Ground
  6     6     DSR   <<--      Data Set Ready (I'm ready to communicate)
  7     4     RTS   -->>      Request to Send (flow control)
  8     5     CTS   <<--      Clear to Send (flow control)
  9     22    RI    <<--      Ring Indicator (telephone line is ringing)

Note: DCD is sometimes labeled CD