c.harles

Maybe this could be of some help.
I recently had a Deye 8kw inverter installed with 3x5kwh Dyness batteries. Initially had BMS communications problems but managed to resolve those.
TLDR; Used normal LAN patch cable from Matrix Warehouse instead of supplied cables.
Long version: Due to recent lack of stock everywhere, I sourced the equipment myself and then arranged an installer afterwards to fit them for me. Installer immediately told me that he had issues with recent installs with the included cables not working on this inverter combo (for whatever reason.) I was advised to buy 'straight' LAN cables. These are what you get if you drop into your local Matrix Warehouse and ask for LAN patch cable. The type that connects your PC to your internet router. R 39 for CAT6E 1m premade cable off the shelf.   
The installation was completed with included cables before I got the new cables. Everything worked with the inverter set to Lithium, but of course there was no communications between the inverter and BMS, so they worked like dumb batteries. The inverter measured their voltage and acted according to the thresholds that were manually input. Lithium Mode showed as "00" on the inverter. All other BMS values were similar to those in the photos above including temperature -100.
Cable replacement process was the following.
Disconnect the AC grid input as well as AC load breakers. Turn inverter OFF, disconnect DC at inverter. Turn each battery off using its toggle switch. Remove old comms cables. Using new cables, wire inverter CAN port to Battery 1 (Master) IN. Then Battery 1 OUT to Battery 2 IN etc.  Battery 1 (Master) should have DIP 3 set to ON, others OFF. Other batteries should have all DIP switches set to OFF. Next, throw the toggle switches for all batteries to ON.  Press the red button on the master battery only and all batteries should light up together. Connect DC at the inverter, then turn ON the inverter. Reconnect AC breakers At this point my inverter showed Lithium Mode "Dyness" instead of "00". All BMS setting now seem to be sensibly populated, and some parameters even seem to change dynamically, such as "Max A Charge". And a reasonable temperature displays as well.
You might have the same cable problem. Or not. Maybe only the main comms cable was the issue and I replaced all cables for nothing. (They were cheap enough and it worked.)
  
 

Maybe this could be of some help.
I recently had a Deye 8kw inverter installed with 3x5kwh Dyness batteries. Initially had BMS communications problems but managed to resolve those.
TLDR; Used normal LAN patch cable from Matrix Warehouse instead of supplied cables.
Long version: Due to recent lack of stock everywhere, I sourced the equipment myself and then arranged an installer afterwards to fit them for me. Installer immediately told me that he had issues with recent installs with the included cables not working on this inverter combo (for whatever reason.) I was advised to buy 'straight' LAN cables. These are what you get if you drop into your local Matrix Warehouse and ask for LAN patch cable. The type that connects your PC to your internet router. R 39 for CAT6E 1m premade cable off the shelf.   
The installation was completed with included cables before I got the new cables. Everything worked with the inverter set to Lithium, but of course there was no communications between the inverter and BMS, so they worked like dumb batteries. The inverter measured their voltage and acted according to the thresholds that were manually input. Lithium Mode showed as "00" on the inverter. All other BMS values were similar to those in the photos above including temperature -100.
Cable replacement process was the following.
Disconnect the AC grid input as well as AC load breakers. Turn inverter OFF, disconnect DC at inverter. Turn each battery off using its toggle switch. Remove old comms cables. Using new cables, wire inverter CAN port to Battery 1 (Master) IN. Then Battery 1 OUT to Battery 2 IN etc.  Battery 1 (Master) should have DIP 3 set to ON, others OFF. Other batteries should have all DIP switches set to OFF. Next, throw the toggle switches for all batteries to ON.  Press the red button on the master battery only and all batteries should light up together. Connect DC at the inverter, then turn ON the inverter. Reconnect AC breakers At this point my inverter showed Lithium Mode "Dyness" instead of "00". All BMS setting now seem to be sensibly populated, and some parameters even seem to change dynamically, such as "Max A Charge". And a reasonable temperature displays as well.
You might have the same cable problem. Or not. Maybe only the main comms cable was the issue and I replaced all cables for nothing. (They were cheap enough and it worked.)
  
 

Maybe this could be of some help.
I recently had a Deye 8kw inverter installed with 3x5kwh Dyness batteries. Initially had BMS communications problems but managed to resolve those.
TLDR; Used normal LAN patch cable from Matrix Warehouse instead of supplied cables.
Long version: Due to recent lack of stock everywhere, I sourced the equipment myself and then arranged an installer afterwards to fit them for me. Installer immediately told me that he had issues with recent installs with the included cables not working on this inverter combo (for whatever reason.) I was advised to buy 'straight' LAN cables. These are what you get if you drop into your local Matrix Warehouse and ask for LAN patch cable. The type that connects your PC to your internet router. R 39 for CAT6E 1m premade cable off the shelf.   
The installation was completed with included cables before I got the new cables. Everything worked with the inverter set to Lithium, but of course there was no communications between the inverter and BMS, so they worked like dumb batteries. The inverter measured their voltage and acted according to the thresholds that were manually input. Lithium Mode showed as "00" on the inverter. All other BMS values were similar to those in the photos above including temperature -100.
Cable replacement process was the following.
Disconnect the AC grid input as well as AC load breakers. Turn inverter OFF, disconnect DC at inverter. Turn each battery off using its toggle switch. Remove old comms cables. Using new cables, wire inverter CAN port to Battery 1 (Master) IN. Then Battery 1 OUT to Battery 2 IN etc.  Battery 1 (Master) should have DIP 3 set to ON, others OFF. Other batteries should have all DIP switches set to OFF. Next, throw the toggle switches for all batteries to ON.  Press the red button on the master battery only and all batteries should light up together. Connect DC at the inverter, then turn ON the inverter. Reconnect AC breakers At this point my inverter showed Lithium Mode "Dyness" instead of "00". All BMS setting now seem to be sensibly populated, and some parameters even seem to change dynamically, such as "Max A Charge". And a reasonable temperature displays as well.
You might have the same cable problem. Or not. Maybe only the main comms cable was the issue and I replaced all cables for nothing. (They were cheap enough and it worked.)