MODBUS RS485 digital thermostat temperature controller with fan speed controller
W301 Electric room thermostat is featured by unique design and simple operation. Super-luxurious appearance, LED backlight touch keys as well as LCD display showing the room temperature, setting temperature, fan speed and time. It controls the fan speed or electrical cool and heat valve switch and ideal for places installed two pipes central air-condition.
Features
IR remote controllable
Three grades fan speed intelligent controlled with cooling, heating and auto mode
LED backlight control keys, easy identification even in darkness
Energy saving up to 30%
Specification
RS485 interface
Defrost (low temperature protection)
Auxiliary electrical heating function(Option)
Blue Backlight
Working Status: Cool, hot, wind
Technical parameters
| Sensing element | NTC | Power supply | AC 220V±10%, 50/60Hz |
| Accuracy | ± 1ºC | Switch current rating | Resistive: 3A, Inductive: 1A |
| Temperature range | 10ºC ~ 40ºC | Rated Power | <1 W |
| Display range | 0~60ºC | Wirings | Screw-in terminals, each terminal capable of |
| accepting2 x 1.5 mm 2 or 1 x 2.5 mm 2 wires | |||
| Operation environment | 0~45ºC | Housing | ABS + PC Flame Retardant |
| Operating Humidity | 5~90%RH (non-condensing) | Protection Class | IP30 |
| Display | LCD | Dimensions | 86 × 86 × 13 mm ( W × H × D ) |
MODBUS Operation Manual
1,MODBUS communications
Temperature controller to modify the internal registers is controlled by 485,output control.MODBUS RTU communication protocol using standard communication protocols.Serial port settings:Baud Rate
”9600”, Parity bit”no”,Data bits”8” Stop bits”1”.
1.1Communication format
| Communication machine No | Command code | Data address | communication data | CRC Check |
| 1Byte | 1Byte | 2Byte | 2Byte | 2Byte |
1.2 Communication Machine NO.
1----32
1.3 Command code
| Command code | operating content |
| 03H | Read the specified address data |
| 06H | setting the specified address data |
| 83H | the error returned |
1.4 Communication paradigm
For example, PC sends the following command
| Communication machine No | Command code | Data address | communication data | CRC Check |
| 01H | 03H | 003BH | 0001H | F5C7H |
Command interpreter: Reading the indoor temperature, the register address 3BH
Rreturn the same command, proved successful reception and return temperature is 25 degrees.
| Communication machine No | Command code | Data address | communication data | CRC Check |
| 01H | 03H | 003BH | 001EH | B40FH |
Communication error is returned:
| Communication machine No | Command code | address
| CRC Check |
| 01H | 83H | 03H | 0131H |
then resend the command until the reception was successful
2. Register address map
| register address | register description |
| 66H | Setting mode "01"cold ,"00"heater, "02", ventilation |
| 3AH | Lock up and down keys adjustment, 0 unlock 1 lock |
| 3BH | Room temperature |
| 39H | setting temperature |
| 60H | Switch control 00 shutdown,01 starting up |
| 65H | Set the wind speed 0 low 1 medium 2 high |