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@@ -1,3 +1,25 @@
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# iEMforGEN24
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-Modbus TCP translator for Schenider Electric iEM3000 series power meter to simulate a Fronius Smart Meter for the Fronius GEN24 inverter
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+I installed a Fronius GEN24 Symo 10.0 inverter at home not a long time ago (2024), but I already had a power meter near my utility meter. My meter is a Schneider Electric iEM3155 (A9MEM3155). So I didn't want to spend 250€ more in a meter from Fronius, especially a three-phase one (as they are quite expensive).
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+
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+The iEM3155 only support Modbus RTU to collect data from it, so I installed a Modbus RTU to Modbus TCP Gateway from USR (USR-DR302 : https://www.pusr.com/products/din-rail-rs485-serial-to-ethernet-converter-usr-dr302.html), as I need multiple masters to access the iEM3155 data.
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+
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+Thanks to a German forum (https://www.photovoltaikforum.com/thread/185108-fronius-smart-meter-tcp-protokoll/?pageNo=1), I learned that the GEN24 accept to receive the meter data in Sunspec format.
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+
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+So I made this translator. I ma not a software engineer, and my coding skills are quite low. S I basically used an example from libmodbus and made it works for my purpose.
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+
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+To configure it, you just have to change few define at the begining of the file.
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+
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+You will need a libmodbus to compile this software. If you are on Ubuntu or Debian, you can run `sudo apt install libmodbus-dev`
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+
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+To compile it, I run this command:
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+```
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+gcc modbus-fronius.c -o modbus-fronius -I/usr/include/modbus -lmodb -lm
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+```
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+
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+Then you can start the executable like this:
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+```
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+./modbus-fronius
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+```
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+
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+Or you can make a systemd service to make it start at booting time.
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