Writing to Modbus

[Amelie]

Hello,

I'm trying to write to the Modbus of my Nine heatpump. I have the script:

Code:

require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.1.65', 502)
mb:connect()
mb:writeregisters(1078, 1)
mb:close()

The code is not tested yet, so there are probable faults in.

But, now I realised, that when I looked to the modbus, there are 2 registers withe the number 1078, a holdingregister and an inputregister.

Code:

Titel                    Type register            Register
Status meer warmwater    MODBUS_INPUT_REGISTER    1078
Ontdooitijd (FLM 3)    MODBUS_HOLDING_REGISTER    1078

How can I make sure that I write to the correct register.?

[admin]

Input registers and holding registers are different entities so they can have the same address. Only holding registers are writable, input registers are read-only.