Get a 2nd ch340 cable for sure, they are cheap and I have at least one cable that the connection breaks depending on how I have the cable bent/wired, usually it breaks internally where I bend it alot. Shouldn't need to worry about the pin out on either cable but for the rj45, I believe that is for connecting to the canbus of your bms as it appears the inverter has different communication protocols, (pace, rata, allgrand, 0liter, pct, etc..) from what I can see.
Also keep in mind the Tracer MPPT communicates somewhat differently, I expect you to use WatchPower and the rj45 on that model. For the POWMR and SNRE we are talking about in this thread use the USB! Also please do not hijack this thread!
I have uploaded the latest version of iPower v2.1 below, also the ch341 serial driver I have been using. Also note this driver gets installed with iPower. Check the main install folder in C:\Program Files\iPower\ch341ser.exe
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Install the program above and drivers, connect your cable and confirm in device manager that baud is 9600. Then open iPower, if everything is connected you should see an address1 under standalone inverters, go to the communication tab and ALSO make sure it says 9600, both of these need to agree. Now go back to main iPower tab and confirm the com port then click open comm, info will flow within 2-3 seconds. If the PC goes to sleep you may need to hit the search devices button, then click com and confirm and finally open comms. Annoying but seems to be 100% for my connection.
To recap there are a few ways to access the data on this version of inverter at this point.
1. iPower 1.6 - Windows OS (from SNRE website)
2. iPower 2.1 - Windows OS (from Scott @ SNRE)
3. Modbus - Android (only rudimentary HEX/Decimal commands)
4. SNRE Debug Program - Windows OS (from POWMR website)
5. Solar Assistant - Raspberry Pi (Currently adding Support for this model, email @support for updates)
Further more I have compared the differences in iPower 1.6 and iPower 2.1, it does not appear much has changed. I have attached a screenshot showing the changes. One such change was in the information file, they simply stopped a value from showing in the program. This is a minor revision without ANY functionality changes. Another was an update to the help pdf files, also the uninstaller and firmware update utility had binary changes. Nothing much..
If I was dreaming about the best software solution would it be SolarAssistant or integration with Venus OS?