Hi,
I have a Procon A1M gateway attached to my Mitsubishi Ecodan EHST20C System. It works over Modbus. Both status LEDs show correct communication (blinking).
I can read everything I want from the registers and even write on/off commands into some coils and holding registers like Force DHW and System On/Off. It takes some time for it to actually show effect on the unit but it works.
However, when I try to set a value into “Water Tank Setpoint”, it refuses to work. It just jumps back to the value before the command.
When I change the desired setpoint value manually via the Mitsubishi Display, I can see the channel reacting to that in OH. So I think I am trying to write into the correct register at least.
Settings are:
Read: 16bit unsigned integer/ signed integer (both work)
Write: 16bit (there is only option for 16 bit)
I searched the manual but didn’t find any hint for this problem. Maybe this function (like external commands for Setpoints) is blocked within the actual unit?
Hey @Tuny ,
here my config. I am on Openhabian 4.0.2 on a Raspi 4.
I Put the log for Modbus on ERROR. But i dont see any errors after sending the command.
Tried to disable reading by removing the read adress. But the thing goes offline then.
Can you please try the autoupdate="false" parameter:
Also: The thing should not go offline when you remove the reading parameter.
Please try again. Is there a specific error?
With openhabian the frontail service should be installed and you can access your logs by using the browser with port number :9001.
hmm this is strange.
Do you have a USB to RS485 converter?
So you could try to write the value with a windows tool like “Modbus Poll” to see if it works in general?