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

David Lord snews at lordynet.org
Thu Dec 24 12:25:53 UTC 2009


Rob van der Putten wrote:
> 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

I saw it as CTS on brown and RI on Orange

> 
> 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.
> 

All refclocks docs I've checked, by no means all, expect serial
data on RxD.

Merry xmas to all

David




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