[LinuxPPS] Using GPS for automotive applications

[Remco den Besten]

DCD is input and modern chipsets (16550's) are well 
capable of detecting TLL levels. 

I do not use an interface other than an inverter (LS00) as buffer
as precaution, but this is not necessary. 

> Neal Probert wrote:
>> PPS Interface
>> -------------
>> The simplest way I can see interfacing the PPS is through a MAX232 chip 
>> into the serial port's DCD input.  Right?
> 
> In some cases (maybe even most modern cases) you can feed the (TTL?) PPS
> into the RS232 DCD pin without trouble. I am using this setup without
> problems.
> 
> Depending on the board you maybe can jumper the RS232 port to 5V
> operation, as on some of my Epia boards.
> 
> A max232 convertor costs a few ns of delay.