[ntp:questions] Tobit LAN!Time DCF77 receiver not working

Rob van der Putten rob at sput.nl
Thu Dec 24 11:19:49 UTC 2009


Hi there

Marc-Andre Alpers wrote:

> I have no RS232 tester. The cover of the receiver is sealed. No screws.
> http://666kb.com/i/bf7g1grgo1sbus2c1.jpg
> 
> The connector inside:
> http://666kb.com/i/bf7fxqd8cr17q7d8x.jpg

That's female on the left and male on the right?

> http://666kb.com/i/bf7g2xelg4xqppx3l.jpg

That's male on the left and female on the right?

> The transistor type is:
> MC78L
> 05ACP
> M535

That's a 78L05; A 100 mA +5 V stabilizer IC.

The circuit appears to be as follows;

     M       F
DCD 1 ----- 1
RXD 2 ----- 2
TXD 3 ----- 3
DTR 4 ----- 4
GND 5 --+-- 5
         |
         |
         +----------+-----> Red   GND
                    |
                  +-+-+
         +--------+ S +---> Black +5V
     F   |   M    +---+
DSR 6   |        78L05
RTS 7 --+-- 7
CTS 8 --------------------> Orange
RI  9 --------------------> Brown

The circuit 'expects' NTPD to raise RTS and read from CTS or RI.
As far as I can tell NTPD does raize RTS but does not read from CTS or RI.


Regards,
Rob
-- 
Nowadays people know the price of everything, and the value of nothing
Oscar Wilde




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