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

[Bart Theeuwes]

Hi Udo,

Great!

Just to be sure, is the version I have not compatible with 3v3 / y-port
node, or do you think that mine is broken / wrong assembled?

Regards,

Bart

2013/3/23 Bart Theeuwes <bart.theeuwes at gmail.com>

> 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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