-40…+120°C temperature and humidity probe
The temperature humidity sensor has a very small size and adopted with sintered copper protective shell or PE water-proof protective shell, which has air permeability, high temperature resistance and resistance to corrosion materials. The sensors are more stable and accurate, which is suitable for outdoor rain and high humidity agricultural greenhouse, etc.
|Wiring of the temperature probe|
|Red||Power + 3.3…24V|
|Baud rate:||9600 as default|
|Modbus ID address:||1-255, default is 1|
|Function code:||03 (Read), 06 (Write)|
|Temperature meassuring range:||-40..+120°C|
|Humidity meassuring range:||0-100% RH|
|Humidity accuracy:||3% RH|
|Measurement resolution:||0.1°C, 0.1%RH|
|Power protection:||Anti-reverse connection, ± 15kV ESD surge protection|
|Cable length:||1 meter|
|No communication, power on||1 flash each 4 seconds|
|Communicating||2 flashes within one second|
The temperature-humidity sensor is ultra-low power consumption and has 2 kinds of working modes as below:
1. Standby-Working Mode:
After power ON, the sensor goes into standby-working mode. Under such mode, the sensor receives command from master and response accordingly with related data. Communication indication light flickers normally, after each inquiry of temperature and humidity,the sensor will refresh value of temperature & humidity once.
2. Sleep-working mode:
After receiving sleeping command, the sensor will close indicate light and stop receiving data from RS485 wire, under such time, the system will be under sleeping status of ultra-low power consumption. If there is no connection of pull-up/pull-down resistor inside of the sensor, the static current is smaller than 5ua. If connected with a pull-up/pull-down resistor inside of the sensor, the static current is 50ua.
When sleep time is over or power is reseted, the sensor will automatically go to standby working mode. We suggest to send sleeping command to put the sensor into sleeping mode after each inquiry of temperature and humidity value, meanwhile, prolong reading interval of temperature and humidity value as long as possible.