Connect to a Nibe heatpump with modbus via RS485

[johanax]

Thanks Edgars,
How do I send the acknowledge, see documention below?

When valid data is received (checksum ok),
ACK (0x06) should be sent to the heat pump.
When checksum mismatch,
NAK (0x15) should be sent to the heat pump.


If heat pump does not receive acknowledge in certain time period,
pump will raise an alarm and alarm mode is activated.
Actions on alarm mode can be configured. The different alternatives
are that the Heat pump stops producing hot water (default setting)
 and/or reduces the room temperature.

Regards Johan