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absalom-muc / MHI-AC-Ctrl

Reads and writes data (e.g. power, mode, fan status etc.) from/to a Mitsubishi Heavy Industries (MHI) air conditioner (AC) via SPI controlled by MQTT
MIT License
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Support for SRK13CHV? #194

Closed ferbulous closed 2 months ago

ferbulous commented 3 months ago

Hi, not a bug I have a question regarding the CNS port For my MHI (SRK13CHV-4), that port isn’t listed in the diagram and I couldn’t remove the pcb without some downtime

IMG_4165 IMG_4163

I googled the model number instead and apparently there’s CNS labeled with no JST connector

IMG_4511

Am i correct to assume that port is still functioning and all I need to do is just solder JST connector to it?

glsf91 commented 3 months ago

Only somebody with the same unit and did the same can tell you. There will be a reason the connector is not there. But you can give it a try.

ferbulous commented 3 months ago

Just noticed this post here where the pins just need to be soldered

https://github.com/absalom-muc/MHI-AC-Ctrl/issues/143#issuecomment-1510408359

Unfortunately it looks like my unit has 6 pins instead of 5

Dennisjvdb commented 2 months ago

Would it be possible to design a PCB with a 6 pin connector? So the models with CNE port or 6pin CNS port can also be supported?

ferbulous commented 2 months ago

I'd say the better question is if we could send a replacement pcb with a 6 cns pin to the dev @absalom-muc if he could work with that.

Dennisjvdb commented 2 months ago

I think al models have a 6-pin cne connector. Might be better as no soldering would be required.

absalom-muc commented 2 months ago

When my understanding is correct we don't know the technical differences between the 5 and 6-pin connector, e.g.

  1. Can the 6-pin connector be used for a remote control? (someone could check if there exists a commercial available remote control for this.)
  2. What is the protocol used for the 6-pin connector? (could be also MHI-SPI-Ctrl's SPI, or could be completely different)
  3. If it is SPI what is the purpose of the 6th pin and what is the assignment of the other pins

btw: I don't plan adaption for a 6-pin version

Dennisjvdb commented 2 months ago

In this project, the CNE connection is used for added features. So, I think it can be used for remote control. I'm not sure what the protocol is, as I have a limited understanding of these protocols. If the same protocol is used and we know the pin assignment, would it theoretically be possible to connect this module to a 6-pin male connector without using the 6th pin?

absalom-muc commented 2 months ago

Here, I see only a 5-pin connector. Can't see if it is the usual 5-pin CNS or something different. And I can't find an accessable schematic (I don't use Kikad)

Dennisjvdb commented 2 months ago

I think this is the schematic in pdf.

absalom-muc commented 2 months ago

Ah, o.k., but no support of 6-pin: grafik

glsf91 commented 2 months ago

I think we can close this one. Otherwise I can reopen it if needed.