DanVex DD Series - MODBUS and RS485 Communication

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.