They probably brought out pin 7 for DGPS input since the 1 PPS signal would not be
of much use in vehicle tracking. Don't know why they brought it(PPS) to DB9-6
unless this is some standard for time references.

> According to the RS232 interface schematic, Pin 6 on the Interface
> connector of the GPS goes to pin 1 of the MAXIM 233 IC. Mine has a Flex
> PCB connector which connects to terminals on the side of the can. Pin 6 (
> 1 PPS signal) of the interface connector is not connected on this flex
> PCB, but pin 7 ( RXD2) is. Is pin 6 the correct pin to use, or did they
> really mean pin 7?
>
> Anyone know the reason for using this signal that eventually ends up at
> the DB9 pin 6 of the PC COM port?
>
> If anyone can v

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