Seeed Studio S-Light-02 Industrial Light Intensity Sensor User Guide
- June 10, 2024
- seeed studio
Table of Contents
Seeed Studio S-Light-02 Industrial Light Intensity Sensor User Guide
Product Introduction
S-Light-01 ambient light sensor, or illuminance sensor, measures the ambient illuminance. Eachsensoriscalibrated and offers excellent accuracy and consistency. The sensor is applicable for scienceresearch,solar power , greenhouse, weather station etc.
- Measurement range to 200000lux
- Output interface with RS485, Voltage
- Level indicator and spring loaded for installation
- Water proof to IP66 can be used outdoor directly
- High accuracy and consistency with excellent stability
- Reverse power protection and Built-in TVS/ESD protection
Specifications
Output Interface| Analog Voltage 0-2V (Output resistance ~0ohm)| RS485
Modbus-RTU
Power Supply| 3.9-30V/DC| 3.9-30V/DC
Power Consumption| 7mA@24V DC| 7mA@24V DC
Illuminance Range| Range:0～200000 Lux, Accuracy:±6% , Resolution:1lux
Direction Error| 30°±3%,60°±6%,80°±24%（Cosine Characteristics）
IP Ratings| IP66
Operating Temperature| -40~85°C
Installation| Screw hole 3
Cable Length| 2 meters
Dimension| 7555*58mm
Wiring
| Type | Wiring diagram |
|---|---|
| Analog Voltage Output | Red (V+): Power Supply + Black (G): Power Supply |
– Blue (O1): Analog Output
RS485 Modbus| Red (V+): Power Supply + Black (G): Power Supply –
Yellow (T+): RS485+/A/T+ White (T-): RS485-/B/T- **
**All RS485 communication parameters (Modbus Slave Address, baud rate, parity,
data bits, stopbits) are set in internal register and can be saved when power
down, the factory setting is ADDRESS=1, BAUDRATE=9600bps,PARITY=NONE,
DATABITS=8bits, STOPBITS=1bit;Sometimes you may FORGET the communication
settings, In this case, you can open the shield module and press the SET
button for more than 3 seconds, then all thecommunication parameters are reset
to factory setting, then communicating with the sensor
Dimension
Safety, Care and Installation
Care and Safety
Keep the white optical lens on the top of the sensor clean and wiping lens by
soft rag. Alwayscheckingthe horizontal bubble to keep the sensor horizontally
placed. 4.2
Installation
Adjusting the screw and checking the horizontal bubble to make the sensor
horizontally installed.
Output Signal Conversion
| Output Interface | Parameters Range | Conversion Formula |
|---|---|---|
| Analog Voltage Output 0-2V | ILLU: 0-200000 lux | ILLU=RANGE* |
VLOTAGE/2.00.When RANGE=2000 lux and VOLTEGE=1.0V,then ILLU
=2000*1.00/2.00=1000lux
RS485 Modbus-RTU| ILLU: 0-200000 lux| ILLU =(32-Bits REGISTER
VALUE).When REGISTERVALUE=1000,then ILLU= 1000 lux
RS485 Modbus Protocol
Modbus Protocol
Modbus Protocol is widely used to establish master-slave communication between
intelligent devicesorsensors. A MODBUS message sent from a master to a slave
contains the address of theslave, thefunction code (e.g. ‘read register’ or
‘write register’), the data, and a check sum (LRC or CRC). The sensor is RS485
interface with Modbus protocol. The default serial communication
settingsisslaveaddress 1, Modbus RTU, 9600bps, 8 data bits and 1 stop bit. All
communication settings can bechangedwith Modbus command, and take effective
after re-power up the sensor.
Following Modbus function code are supported by sensor.
Modbus Function Code 0x03 : used for reading holding register.
Modbus Function Code 0x04 : used for reading input register.
Modbus Function Code 0x06 : used for writing single holding register.
Modbus Function Code 0x10: used for writing multiple holding register.
Modbus Register
Parameters| Register Addr. (HEX/DEC)| Data Type| Modbus
Function Code(DEC )| Range and Comments| Default Value
---|---|---|---|---|---
ILLUMINANCEHIGH 16 Bits| 0x0000 /0| UINT16RO| 3/4| 0-200000 for0-200000lux|
N/A
ILLUMINANCELOW 16 Bits| 0x0001 /1| UINT16RO| 3/4
STATUS| 0x0002 /2| UINT16 RO| 3/4| BIT15-BIT2: Reserved BIT1: Sensor
ErrorBIT0: Over Range| N/A
RESERVED| 0x0003 /3| UINT16RO| 3/4| 0| 0
RESERVED| 0x0004 /4| UINT16RO| 3/4| 0| 0
RESERVED| 0x0004 /5| UINT16RO| 3/4| 0| 0
| | | | |
SLAVEADDRESS| 0x0200 /512| UINT16R/W| 3/6/16| 0-255| 1
BAUDRATE| 0x0201 /513| UINT16R/W| 3/6/16| 0-60:1200bps 1:2400bps 2:4800bps
3:9600bps 4:19200bps 5:38400bps| 3:9600bps
PROTOCOL| 0x0202 /514| UINT16R/W| 3/6/16| 00:Modbus RTU| 0:Modbus RTU
PARITY| 0x0203 /515| UINT16R/W| 3/6/16| 0-20:None 1:Even 2:Odd| 0:None Parity
DATABITS| 0x0204 /516| UINT16R/W| 3/6/16| 11:8 databits| 1:8databits
STOPBITS| 0x0205 /517| UINT16| 3/6/16| 0-1| 0:1 stopbit
NOTE: UINT16:16 bit unsigned integer, INT16:16bit signed integer
NOTE: RO: Register is Read Only, R/W: Register is Read/Write
NOTE: HEX is Hexadecimal (data with 0x/0X prefix), DEC is Decimal
Modbus Register Detail Description
ILLUMINANCE – HIGH 16 BitsILLUMINANCE – LOW 16 Bits
Data Range| 0-200000 for 0-200000 lux| Default: N/A
Power DownSave| N/A|
Example: When REGISTER(HIGH 16 Bits) = 0x0003 (HEX format) and REGISTER(HIGH16Bits)=0x0D40 (HEX format), then VALUE=(0x0003 *65536+0x0D40) = 200000lux
STATUS
Data Range| BIT15-BIT2: Reserved, always 0 BIT1: Bit set when sensor
errorBIT0: Bit set when overrange| Default: N/A
Power DownSave| N/A|
Note: Sensor status
SLAVEADDRESS — Modbus Slave Address
Data Range| 0-255| Default: 1 or 13
Power DownSave| YES|
Note: Please re-power on the sensor to take effective after set. The default slave address for sensorswitha waterproof aviation connector is 13. The default slave address for sensors with hookup wires is1.
BAUDRATE — Serial Comm Baudrate
Data Range| 0-5 0: 1200bps 1: 2400bps 2: 4800bps 3:
9600bps 4: 19200bps| Default: 3
| 5:38400bps|
Power DownSave| YES|
Note: Please re-power on the sensor to take effective after set
PROTOCOL — Serial Comm Protocol
Data Range| 00:Modbus RTU| Default: 0
Power DownSave| YES|
Note: Please re-power on the sensor to take effective after set.
ACTIVEOUTPUTINTERVAL — Serial Comm Active Output Interval time
Data Range| 0-255 for 0-255 seconds, 0 for disabled| Default: 0
Power DownSave| YES|
Note: Please re-power on the sensor to take effective after set.
Note: Sensor will output the data actively without any master request
command.
Note: Only ONE sensor should be on RS485 network, or there will be data
collision and corrupt thedataon line.
Note: Refer to SET button to exit the Active Output Mode.
Example: When set to 5 then sensor will output the data every 5 seconds without any master requestcommand.
Modbus Function Code
For description below, data started with 0X/0x means that it’s in HEX format.
Function Code 3 Protocol Example
Master Request: AA 03 RRRR NNNN CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x03 | 1 byte | Function Code 3 |
| RRRR | 2 byte | Starting Register Addr |
| NNNN | 2 byte | Quantity of Register to read |
| CCCC | 2 byte | CRC CHECKSUM |
Slave Response: AA 03 MM VV0 VV1 VV2 VV3… CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x03 | 1 byte | Function Code 3 |
| MM | 1 byte | Register Data Byte Count |
| VV0,VV1 | 2 byte | Register Value (High8bits first) |
| VV2,VV3 | 2 byte | Register Value (High8bits first) |
| … | … | Register Value (High8bits first) |
| CCCC | 2 byte | CRC CHECKSUM |
Example: Read register 0x0200-0x0201,that is slave address and baud rate. Master Request:01 03 0200 0002 C5B3
Master Request:01 03 0200 0002 C5B3
| Slave Addr. | 1 byte | 0x01 |
|---|---|---|
| Function Code | 1 byte | 0x03 |
| Starting RegisterAddr. | 2 byte | 0x0200 |
| Quantity ofRegister to read | 2 byte | 0x0002 |
| Checksum | 2 byte | 0xC5B3 |
Function Code 4 Protocol Example
Master Request: AA 04 RRRR NNNN CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x04 | 1 byte | Function Code 4 |
| RRRR | 2 byte | Starting Register Addr |
| NNNN | 2 byte | Quantity of Register to read |
| CCCC | 2 byte | CRC CHECKSUM |
Slave Response: AA 04 MM VV0 VV1 VV2 VV3… CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x04 | 1 byte | Function Code 4 |
| MM | 1 byte | Register Data Byte Count |
| VV0,VV1 | 2 byte | Register Value (High8bits first) |
| VV2,VV3 | 2 byte | Register Value (High8bits first) |
| … | … | Register Value (High8bits first) |
| CCCC | 2 byte | CRC CHECKSUM |
Master Request: 01 04 00 00 00 02 71 CB
| Slave Addr. | 1 byte | 0x01 |
|---|---|---|
| Function Code | 1 byte | 0x04 |
| Starting Register | 2 byte | 0x0000 |
Slave Response: 01 04 04 0000 004D 3BB1
| Slave Addr. | 1 byte | 0x01 |
|---|---|---|
| Function Code | 1 byte | 0x04 |
| Register Data ByteCount | 1 byte | 0x04 |
| Register Value:Illuminance high 16 bits | 2 byte | 0x00(HIGH 8 Bits) |
0x00(LOW8 Bits)
Register Value:Illuminance low 16 bits| 2 byte| 0x00(HIGH 8 Bits)
0x4D(LOW8 Bits)
Checksum| 2 byte| 0x3BB1
Function Code 6 Protocol Example
Master Request: AA 06 RRRR VVVV CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x06 | 1 byte | Function Code 6 |
| RRRR | 2 byte | Register Addr (High8bits first) |
| VVVV | 2 byte | Register Value (High8bits first) |
| CCCC | 2 byte | CRC CHECKSUM |
Slave Response: AA 06 RRRR VVVV CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x06 | 1 byte | Function Code 6 |
| RRRR | 2 byte | Register Addr (High8bits first) |
| VVVV | 2 byte | Register Value (High8bits first) |
| CCCC | 2 byte | CRC CHECKSUM |
Function Code 16 Protocol Example
Master Request: AA 10 RRRR NNNN MM VVVV1 VVVV2 …CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x10 | 1 byte | Function Code 0x10 |
| RRRR | 2 byte | Starting Register Addr |
| NNNN | 2 byte | Quantity of Register to write |
| MM | 1 byte | Register Data Byte Count |
| VVVV1 | 2 byte | Register Value(High8bits first) |
| VVVV2 | 2 byte | Register Value(High8bits first) |
| … | … | Register Value(High8bits first) |
| CCCC | 2 byte | CRC CHECKSUM |
Slave Response: AA 10 RRRR NNNN CCCC
| AA | 1 byte | Slave Address,0-255 |
|---|---|---|
| 0x10 | 1 byte | Function Code 0x10 |
| RRRR | 2 byte | Starting Register Addr |
| NNNN | 2 byte | Quantity of Register to write |
| CCCC | 2 byte | CRC CHECKSUM |
Software Configuration Utility
You can use software listed below to try reading/writing the register of sensor, https://github.com/ed-chemnitz/qmodbus/releases
Document version
| Version | Date | Description | Editor |
|---|---|---|---|
| V1.0 | First Version | ||
| V1.1 | 5/15/2023 | Delete 5 ranges | Yvonne.Meng |