DanVex DD Series, User Manual

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Page 22 of 39
MODBUS protocol and RS485 address
Hardware: RS485
Protocol: MODBUS RTU
Baud rate 9600 (EEPROM can be set), 8-bit data, 1-bit stop, no check bits. Low priority.
Read data
Format:
Slave
Address Function
Code
Start Address Register Number CRC16
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Master 0x01 0x03 0x00 0x01 0x00 0x04 CRC16
Return slave address function code byte count register value CRC16
1 byte 1 byte 1 byte N*2 bytes 2 bytes
Slave 0x01 0x03 0x02 N* 2 bytes CRC16
Setting
Running status:
0x01 Machine Condition 1: Indicate in operation 2: Start 0: Off
0x02 Fan Speed 1-3 3 level fan speed
0x03 Current Humidity (%)
0x04
Current Temperature
(°C)
0x05
Current Humidity
Setting
᧤
%
᧥
0x09 Remote Priority
1: Remote
Temperature and
Humidity 0: Local address
temperature and
humidity
0x0A
Humidifying /
Dehumidifying
Conditions
2: Humidifying 1: Dehumidifying 0: Stop
0x0B Air Mixing Condition 1: Mixed Air
0: Internal
Recirculation
Note: Only one register address is operated at a time.