Feature: 1. Measure Whether: Rain and snow sensor is a qualitative measuring device, which is used to measure whether it rains or snows outdoors or in the nature. 2. Safe and Sensitive: The rain and snow sensor is safe, reliable, beautiful and easy to install. The sensitivity of the sensor is adjustable for more flexible use. 3. AC Measurement Technology: The unique AC measurement technology prevents the oxidation reaction of the sensing plate and ensures long term sensitivity. 4. Automatic Heating: The automatic heating function can be used for snow detection to prevent freezing and condensation when the temperature is lower than 0 ℃ for a long time and the humidity is high. 5. Heating Temperature Range: The temperature during heating shall be strictly controlled within 40 ° C (default value) to prevent excessive oxidation caused by dry burning and prolong the service life. 6. Response Time and Alarm Reset Delay: The response time of rain and snow measurement is less than or equal to 0.5s. Alarm and reset delay can be set to avoid frequent field alarms. 7. IP68 Protection Level: The rain and snow transmitter is designed with IP68 protection level, and can work outdoors for a long time. Specification: Item Type: Rain and Snow Transmitter Material: Plastic Color: As Pictures Shown Weight: Approx. 153g / 5.4oz Power Supply: 10~30V DC Normal Working Power: 0.4W Storage Environment: -40℃~80℃ Output Signal: 485 Relay Parameter Configuration: Software Setting Default Address: 01 Support Function Code: 03, 06 Maximum Heating Temperature: 40 ℃ (Default) Load Capacity Output Relay: 250V AC 1A, 30V DC 1A Product Size: Approx. 89x64x38mm / 3.5x2.5x1.5in Model RS-YUX-N01R01-H Type Switching Value + 485 + Automatic Heating Function Line Sequence VCC GND A B RC RO Brown Black Yellow Blue Green White Ambient Temperature for Heating Start: <15°C (Default) Working Power During Heating: 2.4W Wiring Description: It is widely used for qualitative measurement of rain and snow in environment, greenhouse, aquaculture, buildings, etc. The voltage power input can be 10~30V. When connecting 485 signal lines, note that the two lines A/B shall not be reversed, and the addresses of multiple devices on the bus shall not conflict. Power Positive Power Supply (10-30V DC) (Brown) Negative Pole of Power Supply (Black) Output 485-A (Yellow) 485-B (Blue) Relay Normally Open Contact White, Green 1) The computer has multiple COM ports, and the selected port is incorrect. The device cannot be connected to the PLC or computer. Possible causes: 2) The device address is incorrect, or there are devices with duplicate addresses (factory default is all 1). 3) Baud rate, check mode, data bit, stop bit error. 4) The polling interval and waiting time for response of the host are too short, which should be set above 200ms. 5) 485 bus is disconnected, or A and B lines are connected reversely. 6) If the number of equipment is too large or the wiring is too long, power shall be supplied nearby, 485 intensifiers shall be added, and 120 Ω terminal resistance shall be added at the same time. 7) The USB to 485 drive is not installed or damaged. 8) Equipment damage. Description of Alarm Reset Delay Setting If this value is set to 10S, the device will not consider that it has detected rain and snow and output alarm status until the duration of rain and snow detection exceeds 10S; if the duration of rain and snow detection is less than 10S, the device will consider that it has not detected rain and snow; The same is true when rain and snow return to normal. Default value: 1 second Range: 0~60000 seconds Sensitivity Setting Description The sensitivity value is inversely proportional to the actual sensitivity. That is, the larger the setting value is, the less sensitive the equipment is to detect, and the smaller the sensitivity value is, the more sensitive the equipment is to detect. However, it should be noted that the sensitivity value is too small, which is easy to cause false alarms. It is recommended to use the factory default value. Default value: 800 Range: 500-3500 Data frame format definition RTU communication protocol is adopted, and the format is as follows: Time of initial structure ≥ 4 bytes Address code=1 byte Function code=1 byte Data area=N bytes Error check=16 bit CRC code Time to end structure ≥ 4 bytes Address code: the address of the transmitter, which is unique in the communication network (factory default 0x01). Function code: the instruction function indication sent by the host. This transmitter only uses function codes 0x03 and 0x06. Data area: The data area is specific communication data. Note that the high byte of 16bits data comes first! CRC code: two byte check code.. Package List: 4 x Expansion Plugs4 x Tapping Screws1 x Sensor 1 x Manual