[ntp:questions] Meinberg DCF77 C51 with Linux 2.6

Uwe Klein uwe_klein_habertwedt at t-online.de
Sun Feb 11 20:03:51 UTC 2007


Rune Magnussen wrote:

> What do you mean by a "break condition" ?

Line idle is signal high --> -12V nominal
A byte frame starts with bit wide elements:
a startbit : low ( -12V nominal)
n databits : H or L
if parity  : H or L depends on parity sense and the data value)
Stopbit : 1 or 2 cells high

If the line stays low longer than 1 + n +(p?) cells
a break is generated
the same happened if the currentloop in rs422 was broken
( thus the name )

The linux tty driver (can/will) return \0 for parity and framing
errors or break.

You get forex a break when the sending baudrate is a lot
slower than the receiving rate.

Got a Volt meter?

> 
> /Rune

uwe




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