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+--- Thread: Modbus SunSpec support (/showthread.php?tid=801)
Modbus SunSpec support - joost001 - 22.05.2017
Does the modbus implementation in LM support the SunSpec Modbus Profile? I have an SMA invertor for my solar panels that I would like to query using the modbus protocol the parameters in attachment.
regards,
Joost
RE: Modbus SunSpec support - mlaudren - 22.05.2017
If the modbus bus is not proprietary the LM should be able to handle it.
You can try with this.
Code:
require('luamodbus')
mb = luamodbus.rtu()
mb:open('/dev/RS485', 19200, 'E', 8, 1, 'H') -- change with correct MB settings : speed, parity, stop bit, ...
mb:connect()
if mb ~= nil then
value = mb:readregisters(40188) -- read AC current register
log(value)
mb:close()
endRE: Modbus SunSpec support - admin - 23.05.2017
The correct address is probably not 40188, but either 187 or 188. You can check this quickly with RTU test. If you want to create a profile, then address_scale field should be used to tell where to read the scaling factor from.