Only SDongle aggregate registers (slave 100) reachable — SUN2000-10KTL-M1 via SDongleA-05, no inverter response on any other slave ID

[mendemar]

Setup:

Inverter: SUN2000-10KTL-M1, firmware V100R001C00SPC174
Dongle: SDongleA-05, firmware V100R001C00SPC133
Connection: Modbus TCP, xxx.xxx.xxx.xx:502, home LAN (WiFi mode, dongle already joined to home WiFi — no local web UI reachable on port 80/443 from LAN, connection refused)
HA huawei_solar integration version: 2.1.2

What works:

Slave ID 100 connects fine and returns the SDongle's own aggregate sensors (total input/battery/active power, grid power, load power) — this is my existing working config entry.

What doesn't work:

Slave IDs 0, 1, 2, 3, 101, 201 all either fail to connect outright, or (after ruling out a connection-limit conflict with another Modbus client) return "Connected... but no Huawei Solar device responded on slave ID X."
A third-party device (MY-PV AC ELWA-2, via its own "Huawei Modbus TCP Manual" control mode) successfully talks to the same host:port using slave ID 1 for its own power-control purposes — so slave ID 1 clearly responds to something, just apparently not to the register set/identification read that huawei_solar's config flow expects.

Question: Is there a known additional step (e.g. "Unrestricted Modbus TCP" mode mentioned in the wiki) needed for the SDongleA-05 to expose full inverter registers over LAN, beyond just picking the right slave ID? Or does the presence of a third-party "regulation device" connection (MY-PV) on slave ID 1 permanently claim that ID for control-only use, blocking normal telemetry access to the inverter itself?

[Weafdinstel]

Your SDongleA-05, firmware V100R001C00SPC133 is very old. Please update your sDongle to firmware V200R022C10SPC126 and test again ID1 on port 502.
V200R022C10SPC126 ist the latest firmware wich communicate with all new inverter- and batteriefirmware under oll setups.

[fischmir]

Same problem here and I like to update. I do not find an "update Firmware" Button @ FusionSolar. Any idea, how to update the dongle?

[mendemar]

My electrician carried out the update, but unfortunately I can still only see the dongle with ID 100; I can’t find any other IDs, and even with the latest update – software version V200R022C10SPC320 – there are only 5 aggregate sensors (total input/battery/active power, grid power, load power)

[LotharWoman]

Five sensors with ID100 are normal. If you want more, you absolutely need the ID of your inverters.