Communication forms:

Optiobal modules to Sensonic are determined by plastic height expander, and that's why who have no optional communication module, it is hard buy it and reinstall heat meter. That's why we decide use practically 100% standart interface infra-opto to communicate with UniMetRadio modules.
It expands field of using UniMeterRadio modules without destroying actual possibilities of cooperation with meter. Infra opto header is glue-d by standart stamp doublesided lens, it is removable (for possibility read meter through original ifra opto interface - only in case, that radio module is destroyed, because all, what is readable through the infra opto is readable through the radio too.), it is possible simply stick and un/stick radio module's infra/opto head.
Communication protocol is no-stanndart MBUS protocol, mainly in terms of activating/starting communication. Meter checks communication activity only one time (wake-up period) during the period cca 2.2 seconds, that's why for insuring start of communication it must be 3 seconds long pulse activating. Moreover on one wake-up meter answers only on one request (not waiting for another request). So when it is need use Mbus switch request and when it is only 300 Baud rate here, this meter is one of the slowlest reaction meters.
Reliable answer we give in time cca 8 second, (it's too late for waiting on the side of radio header, if we have not car-accumulator....).
Mainly because this lazy meter we add new function to EEPROM config micro-programm - sending to radio port (which implies in possibility automatic self repeated radio sending of data), and we redefine timing of readings on the level Handlheld-RadioHead.
Ancient concept supposed, that 6 second is period, in frame which are alll meters able to produce measuring data answer.