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Since you say sou want to interface a PIC with that SoC, I'd say you kind of regard the ZM SoC like it is a merely some kind of transceiver. Z-Wave is actually controller, transceiver, radio, SDK, standard for messaging, standard for commands and sensors and much more... You can have good reasons to...

I can't help you with that ZM5304 because it uses a "serial interface protocol" and I have not read the docs in-depth (see ""Serial API Host Appl. Prg. Guide"". It is totally unlike the Z-Uno... It does not look like "building a device with the SDK either". I ...

Oh... Xon/Xoff protocol? Or maybe no handshake at all? Plausible.

I'm sorry to hear about those fried pins... Yeah... 1 k resistors...

A tiny (clone) logic analyzer might come in handy right now.

Well... I thought the same, to make some super-slow-but-usable-transfer-protocol. Transmit to Z-Uno by setting multi-level (dimmer) 0-99, and reply by setting some dummy sensor. Device some handshake protocol. Hmmm... Probably just as fast as morse code ;-) Yes, unsolicited reports every 30 second. ...

Tht's ok, that is a "typical rs232 converter IC" According to the datasheet: "Operates With 3-V to 5.5-V VCC Supply" BTW I have not used RS232 in 10 years :-) my memory is rusty. There is a whole bunch of signals like CTS and DTR that might need to be set, before the UPS wants to...

Yes. The resistors are there, in case you accidentilly connect the uno to 5 or 12 V. Any partnumber on that chip.

My implementation is "power hungry" if you consider 40 mA at 3.3 V "power hungry"... I don not think you can power down the CO sensor. So trying to optimize the Z-Uno seems not worth it in this case.The Z-Uno is always on. You could make devices (actor + sensor) that run with les...

I never saw a "text" variable. I think Z-Wave does allow a manufacturer to transfer arbitrary data, but it is somewhat special. But even If Z-Uno supported this... you still need some support on the controller, so that would be your next problem. If you own a Fibaro RGBW you might have see...

What chip is on that converter board? I suspect possible issues if the nominal voltage is 5 V. The Z-Uno outputs max 3.3 V (actually closer to 3.1 V). That might not be high enough to signify "1". Also, it does not accept more than 3.3 V on any pin, higher voltage with no current limit dam...

Yes, your Z-Uno can implement a relay and/or a dimmer and/or a sensor at the same time. For instance, I have a n RGBW light behind my TV and it also has a CO2 sensor at the same time.