Magellan GPS-3000/4000/315/320 family Power/Data cable connections

Color  DB9  DB25    Signal description
Orange- 3-   2-     Data to GPS unit
Yellow- 2-   3-     Data from GPS unit
Black - 5-   7-     Ground (Power <cig plug> and Data)
Red   - X-   X-   +12vdc power input (cig lighter plug center pin)
Note:  The SIGNAL GROUND for the computer SHARES the BLACK 
       wire going to the Power/data module
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The following is the standard serial data pinout arrangements for
DB25 and DB9 serial ports as well as the motherboard flat cable
connections normally used in PC computers.

Comm Port pinout data
DB25/9 Conn      Flat Cable Connectors
25pin  9 pin   Intel/IWILL  Direct Cable  Function
1-------nc---------nc----------nc----------Chassis Gnd
2-------3----------5-----------3-----------TXD (from CPU)
3-------2----------3-----------2-----------RXD (to CPU)
4-------7----------4-----------7-----------RTS
5-------8----------6-----------8-----------CTS
6-------6----------2-----------6-----------DSR
7-------5----------9-----------5-----------GND
8-------1----------1-----------8-----------DCD
20------4----------7-----------4-----------DTR
22------9----------8-----------9-----------RI
23------NC---------NC----------NC----------DSRD