This device communicates using the Modbus RTU protocol over the RS-485 standard.
This device's preconfigured user-definable address is 0x13. Users can change the address using the holding registers.
The following Modbus function codes are functional with this device.
The following registers are available with this device.
The host device can read one or more sensor data by calling the starting register address.
Request from the host: Device address [1 Byte] + Function code (0x04) [1 Byte] + Input register start address [2 Bytes MSB first] + Requested register length [2 Bytes MSB first] + CRC [2 Bytes MSB first]
Response from the device: Device address [1 Byte] + Function code (0x04) [1 Byte] + Response register length in Bytes [1 Byte] + Register 1 [2 Bytes MSB first] + Register N [2 Bytes MSB first] + CRC [2 Bytes MSB first]
The host device can read one or more configuration registers by calling the starting register address.
Request from the host: Device address [1 Byte] + Function code (0x03) [1 Byte] + Holding register start address [2 Bytes MSB first] + Requested register length [2 Bytes MSB first] + CRC [2 Bytes MSB first]
Response from the device: Device address [1 Byte] + Function code (0x03) [1 Byte] + Response register length in Bytes [1 Byte], Register 1 [2 Bytes MSB first] + Register N [2 Bytes MSB first] + CRC [2 Bytes MSB first]
The host device can write one configuration register.
Command from the host: Device address [1 Byte] + Function code (0x06) [1 Byte] + Holding register address [2 Bytes MSB first] + Value to be set [2 Bytes MSB first] + CRC [2 Bytes MSB first]
Response from the device: Device address [1 Byte] + Function code (0x06) [1 Byte] + Holding register address [1 Byte] + Value set [2 Bytes MSB first] + CRC [2 Bytes MSB first]
The host device can write multiple configuration registers.
Command from the host: Device address [1 Byte] + Function code (0x10) [1 Byte] + Holding register start address [2 Bytes MSB first] + Requested register length [2 Bytes] + Configuration values length in Bytes [1 Byte] + Value to be set 1 [2 Bytes MSB first] + Value to be set N [2 Bytes MSB first] + CRC [2 Bytes MSB first]
Response from the device: Device address [1 Byte] + Function code (0x10) [1 Byte] + Holding register start address [1 Byte], Value set [2 Bytes MSB first], CRC [2 Bytes MSB first]
Writes a single configuration parameter
2
0x10
Write multiple registers
Writes multiple configuration parameters
2 x N
Rainfall (10 mins)
Input Register (R)
0x0004
Rainfall (15 mins)
Input Register (R)
0x0005
Rainfall (30 mins)
Input Register (R)
0x0006
Rainfall (1 hr)
Input Register (R)
0x0007
Rainfall (24 hrs)
Input Register (R)
0x0008
Device Pitch (Actual)
Input Register (R)
0x0009
Device Roll (Actual)
Input Register (R)
0x000A
Device Temperature
Holding Register (R/W)
0x0101
Device Address
Holding Register (R/W)
0x0102
Baud Rate
Holding Register (R/W)
0x0103
IMU Correction (Pitch)
Holding Register (R/W)
0x0104
IMU Correction (Roll)
Holding Register (R/W)
0x0105
Rainfall Correction
0x03
Read holding registers
Returns configuration parameters
2
0x04
Read input registers
Returns measured readings and statistics
2
0x06
Input Register (R)
0x0001
Rainfall (1 mins)
Input Register (R)
0x0002
Rainfall (5 mins)
Input Register (R)
Write single register
0x0003
This device measures the precipitating rain using the tipping bucket mechanism. It transmits data using Modbus RTU communication protocol over the RS-485 standard.
The following table outlines the capabilities of the device.
The following table shows sensor characteristics.
This table shows the mechanical properties of the device.
Environmental Conditions refer to the physical and atmospheric conditions surrounding the device.
This table indicates the electrical specifications of the device.
Absolute maximum ratings indicate the maximum electrical or environmental parameters this device can withstand without damage.
Stresses above the absolute maximum ratings listed in the table may cause permanent damage to the device. These are stress ratings only, and the functional operation of the device under these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
This table lists the communication options of the device.
This device supports the following communication protocols.
Onboard sensors
Rain bucket (Pulse) Optional accelerometer for 2-axis angle detection
Memory
Historical data for internal statistics Configuration and calibration storage
Microcontroller
STM32 C0 Series MCU, 32-bit ARM Cortex-M0+
Rainfall
±0.25mm
0.25mm
25mm
Mounting Style
Screw Mount Optional arm with wall and Sigma profile mount
Dimensions
Main unit: 70d x 70h mm Optional rain gauge: 203mm (8-inch) standard
Base Material
ASA (Acrylonitrile Styrene Acrylate) Impact, wear, and UV resistant
Weight
< 200g
Operating Ambient Temperature
-20°C…+60°C
Relative Humidity
0°C…+30°C: 80% +30°C…+60°C: 50%
Storage
-20°C…+60°C
10%…90% rH
Main Supply
DC 5…24V
RS-485
-7…+12V (No internal termination)
Internal Fuse
DC 60V 6A 1206 Case Slow-burning
Main Supply
DC 30V
RS-485
-7…+12V
RS-485
4-Pin connectivity (Power, GND, RS-485 A, RS-485 B)
