DE N9LQ - DeLand, FL
EIA (1987) RS-232 DB25 STANDARD PIN ASSIGNMENTS
                     (front)
1   2   3   4   5   6   7   8   9  10  11  12  13
 14  15  16  17  18  19  20  21  22  23  24  25

  PIN        NAME                     I/O
  1     Equipment ground              N/A
  2     Transmit data TX    (TXD)     Output
  3     Receive data RX     (RXD)     Input
  4     Request To Send     (RTS)     Output
  5     Clear To Send       (CTS)     Input
  6     Data Set Ready      (DSR)     Input
  7     Signal ground                 N/A
  8     Data Carrier Detect (DCD)     Input
  9     Reserved                      N/A
  10    Reserved                      N/A
  11    Unassigned                    N/A
  12    Secondary RX detect           N/A
  13    Secondary CTS                 N/A
  14    Secondary TX                  N/A
  15    Xmit timming                  N/A
  16    Secondary RX                  N/A
  17    RX timming                    N/A
  18    Unassigned                    N/A
  19    Secondary RTS                 N/A
  20    Data Terminal Ready (DTR)     Output
  21    Signal quality detect         N/A
  22    Ring Indicator      (RI)      Input
  23    Data signal rate detect       N/A
  24    TX signal timming             N/A
  25    Unassigned                    N/A

             IBM DB9 PIN ASSIGNMENTS (front)

                1   2   3   4   5
                  6   7   8   9

  PIN        NAME                     I/O      RShack
  1     Data Carrier Detect (DCD)     Input    red
  2     Receive data RX     (RXD)     Input    orange
  3     Transmit data TX    (TXD)     Output   yellow
  4     Data Terminal Ready (DTR)     Output   green
  5     Signal ground                 N/A      blue
  6     Data Set Ready      (DSR)     Input    purple
  7     Request To Send     (RTS)     Output   gray
  8     Clear To Send       (CTS)     Input    white
  9     Ring Indicator      (RI)      Input    black

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