HMS- / HMT-Inverter and DTU-WLite-S / DTU-Pro-S Details
Links to Whitepapers, FCC IDs and HMS-101 Module Details
Closeup Photos of the disassembled DTU-WLite-S / DTU-Pro-S and HMS-101 Modules without protective metal sheet
Links to several GitHub issues which have so far documented the details
What is the current process flow (communication between ARM-Chip and CMT2300A)?
After switching on the DTU, the initialization phase starts. This is where configurations in memory are retrieved and sub-areas in the DTU are configured with this information. A CMT2300A chip is installed in the transmitter and receiver unit. This chip takes on various tasks and has its task in receiving data from the inverter and forwarding it to the ARM chip. Just as well to send data to the inverter, for example to carry out a limitation.
Hardware
Hoymiles DTU-WLite-S
How to disassemble the DTU?
PCB / front
PCB / backside
Modifications for logging
Hoymiles DTU-Pro-S
PCB / front
PCB / backside
Modifications for logging
Sources