PhilSprague:
Sontex 531 monitor
Is this any help:
A quick note for those interested in heat metering and M-Bus, I’ve managed to read from the Sontex 531 Heat Meter via M-Bus using the heatpump monitor board .
Using the main heatpump monitor firmware: HeatpumpMonitor_AutoTemp , reading from the sontex 531 can be enabled by changing the default Kamstrup_402:
#define MBUS_ENABLE 1
#define KAMSTRUP_402 // KAMSTRUP_403 or SONTEX_531,
to:
#define MBUS_ENABLE 1
#define SONTEX_531
Using M-Bus its possible to access a lot of useful data from the Son…
I can’t see anything in that about hardware connections - what are the terminals called (both the Sontex 531 and the M-Bus reader), and what does the manual say about the data output and how to connect it?
There’s some very recent information about RS485 (it’s likely you have that) here:
I have a try-out of three modbus enabled kWh meters (1x SDM630 and 2x SDM120) and this works just fine. But I still have to do the fuse board installation and move my emoncms from the laptop to a smaller computer (probably a Raspberry Pi 4 with HDD or SSD boot). But I am still a bit uncertain about some RS485 aspects.
The SDM630 will be some 9,5 meters away from the two SDM120 at another fuse board, where also my Raspberry Pi 4 will be present (to host emoncms). I need “a data cable” of some so…