[ntp:questions] Meinberg DCF77 C51 with Linux 2.6
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?
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