according to the docs, the voltcraft vc820 has one of the most bizarre serial commends i have ever encountered, as it basically just transmits the status of the individual segments of the display. while vvvv sports a SevenSegmentSpread which allows to convert text to seven segment data, we somehow missed the ReverseSevenSegmentSpread who does the reverse… but Tokenizer, Mod and /, Radix, and lots of GetSlices should do the trick easily.
ps…fleg already decided to try to get a different multimeter anyway
thanks to sebastian´s telephone support i realized that problems like this are not exactly my kernkompetenz.
i exchanged the conrad multimeter with some noname chinese model, which was undocumented, too, but didn´t send the data in such a bizarre way.
by using a serial port monitor & the mm software i was able to figure it out.