Connect to a Nibe heatpump with modbus via RS485

[johanax]

Hi,
would it be possible possible to use the modbus-mapper to send/read information from my Nibe heat pump,
see protocol description below.

Serial settings: 9600 baud, 8 bits, Parity: none, Stop bits 1
 
 MODBUS module support should be turned ON from the heat pump.
 
 Frame format:
 +----+----+----+-----+-----+----+----+-----+
 | 5C | 00 | 20 | CMD | LEN |  DATA  | CHK |
 +----+----+----+-----+-----+----+----+-----+
 
 Checksum: XOR
 
 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.

Regards Johan