[vz-users] Problem with ir-kopf and y-port node

[Bart Theeuwes]

Hi,

Ok, I think I found the problem. I tested it with the FTDI cable; this
works perfect.

The big difference between the FDTI cable and the y-port node;
The FTDI cable supplies the ir kopf with 5V, the Y-Port node 3v3.

So I measured the signals with the scope and the output levels to the D1 ir
led are very poor.
I also notished some crosstalk of the tx circuit on the rx circuit. At
first, I thought that the receiver was picking up the signal from the
transmitter led because of reflections, but it apears that I don't see this
issue when I connect the ir kopf to the ftdi cable.

I have the ir lesekopf based on this schematic and circuit board:
http://wiki.volkszaehler.org/_media/hardware/controllers/sende-lesekopf5.png?cache=
http://wiki.volkszaehler.org/_media/hardware/controllers/sende-lesekopf_bestueckung.png?cache=

any ideas how to modify the circuit to get this working?

Bart

2013/3/21 Bart Theeuwes <bart.theeuwes at gmail.com>

> Hi Udo,
>
> Many thanks for that.
> However, I still did not success in receiving data from the meter.
> I finaly found some time to do some debugging.
>
> I now connected a ftdi cable directly to the yport node. I notished one
> thing, when I am sending data to the yport node, i'm losing bytes, but the
> data streams are less then 511 bytes (buffer length).
> I also notished when I send data from the yport node to the fdti cable,
> there are some 'pauses' between pieces of transmission, I don't know if
> this affects the meter.
>
> I am wondering one thing; is the low baudrate possible with the supplied
> clock of 12,5 Mhz? I couldn't find if any clock divider is used, whats the
> main clock speed of the cpu?
>
> Regards Bart
>
> 2013/2/24 Udo1 <udo1 at gmx.net>
>
>> Am 24.02.2013 13:22, schrieb Bart Theeuwes:
>>
>>  I reconfigured ethersex so it uses 300 bps and 7E1 on the second uart
>>> port (default).
>>>
>> Hi Bart,
>>
>> there is a problem in ethersex adjusting the framerates.
>> I send you a link to a personal version I used with the yport-node.
>>
>> Regards
>> Udo
>>
>
>
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