homepage/legacy/posts/2014-03-09.01/article.html

define(`TITLE', `4 Channel MBus-connected Thermometer, Part 2')
define(`DATE', `2014-03-09')
define(`CONTENT', `
AVR-Arduino replaced by ARM-based Teensy, due to memory shortness:

<a href="http://a385e-5.de/wp-content/uploads/2014/03/Foto-2.jpg"><img src="http://a385e-5.de/wp-content/uploads/2014/03/Foto-2-300x225.jpg" alt="Foto 2" width="300" height="225" class="alignnone size-medium wp-image-416" /></a>

MBus-transceiver TSS721A in breadbroad setup with two opto-coupler, connected to the thermometer and to the lab MBus-master:

<a href="http://a385e-5.de/wp-content/uploads/2014/03/Foto-1.jpg"><img src="http://a385e-5.de/wp-content/uploads/2014/03/Foto-1-300x225.jpg" alt="Foto 1" width="300" height="225" class="alignnone size-medium wp-image-415" /></a>

Test setup with thermometer, MBus-transceiver and lab MBus-master (still open enclosure since over current protection is not yet available, just to not forget it ...):

<a href="http://a385e-5.de/wp-content/uploads/2014/03/Foto-4.jpg"><img src="http://a385e-5.de/wp-content/uploads/2014/03/Foto-4-300x225.jpg" alt="Foto 4" width="300" height="225" class="alignnone size-medium wp-image-414" /></a>
And, yes, it works so far. Although it was a bit of a surprise to see the echo of any sent frame, however, the documentation revealed that this is actually a collision detection feature.

')