Products > Test Equipment
RS232 decoding vs UART decoding - Rigol ds1054z seems confused (or maybe I am)
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Njk:
Certain AWGs can generate such a waveform. No need to keep in mind every boring detail when the manual provides a good reference. That's why an instrument with poor manual is annoying to operate, similar to that with a broken knob or mangled connector
TomKatt:
When I hear "hex values are inverted", I interpret that as Endianness - NOT inverted bits.  Bit inversion is not the same as high byte / low byte.  If you "flip" the hex values around, that infers those hex values are correct (so the bits are correct) but sent in a different order.  I'm not familiar with the DS1054Z to know if it has a setting to swap the decode results.
pdenisowski:

--- Quote from: Njk on June 03, 2024, 03:54:09 pm ---Certain AWGs can generate such a waveform.

--- End quote ---

For most of my presentations, I usually simply use a Raspberry Pi or Arduino to generate test signals.  This also allows you to code in "fun" messages :)
ebastler:

--- Quote from: Njk on June 03, 2024, 03:54:09 pm ---Certain AWGs can generate such a waveform. No need to keep in mind every boring detail when the manual provides a good reference. That's why an instrument with poor manual is annoying to operate, similar to that with a broken knob or mangled connector

--- End quote ---

All very true, but of limited relevance here, since we are talking about decoding rather than generating RS-232 signals?

Also, I note that the generator for which you attached the user manual apparently does not really support either of the critical parameters we were discussing here: Signal polarity and order of bits. One can invert the whole output signal, I assume, but then has to fudge the transmitted bit pattern by manually inverting the entered value. And likewise, one has to improvise an inverted bit order by fudging with the data byte once more -- especially annoying when it can be entered as a decimal value only.

So, while I applaud the manual for documenting these restrictuions clearly, I am not convinced by the generator itself. 
langwadt:
it would be very odd for uart to not use the standard bit order or either invert all or none of the bits
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