Serial connectors

There's a CN6: COM PORT on board. This is non-standard, but works fine. You will need to go to the surplus store for a connector, but here's the pinouts. DSB-9 is a standard Serial, CN6 and CN15 are known serial ports. U2 is one K-Ray believes works as well.

DB-9   CN6   CN15    U2?   SIGNAL
   1     3      3   94/84  DCD (data carier detect)
   2     4      4   99/89  RxD (receive data)
   3     5      5  100/92  TxD (transmit data)
   4     6      6   96/86  DTR (data terminal ready)
   5     2   2/10/16  91   GND (ground)
   6     7      7   95/85  DSR (data set ready)
   7     8      8   98/88  RTS (request to send)
   8    11     11   93/83  CTS (clear to send)
   9    12     12   97/87  RI (ring indicator)
   -     1     1/9    90   +5V