INSTRUCTIONMANUAL
HUMIDITY TEMPERATURE TRANSMITTER
TYPE RS485
JXBS-3001-TH
VER1.1
WeihaiJXCTElectronicTechnologyCo.,Ltd.
ⅠBrief Introduction
1.1 Product Overview
This product adopts high sensitivity photosensitive probe, the signal is stable and the precision is high. It has the characteristics of wide measurement range, good linear degree, good waterproof performance, convenient use, easy installation and long transmission distance.
1.2Primary Parameters
PARAMETERS | TECHNICAL SPECIFICATIONS |
POWER SUPPLY | 12-24V DC |
POWER | 0.4W |
OUTPUT SIGNAL | RS485 |
RESPONSE TIME | ≤15S |
LONG-TERM STABLE TEMPERATURE | ≤0.1℃/year |
LONG-TERM STABILITY OF HUMIDITY | ≤1%y |
TEMPERATURE RANGE | -40℃-80℃ |
HUMIDITY RANGE | 0-100%RH |
TEMPERATURE RESOLUTION | 0.1℃ |
HUMIDITY RESOLUTION | 0.1%RH |
POWER CONSUMPTION | ≤0.15W(@12V DC , 25℃) |
WORKING PRESSURE RANGE | 0.9-1.1atm |
1.3Probe Parameters and Selection
PRODUCT TYPE | PROBE TYPE | TEMPERATURE ACCURACY | HUMIDITY ACCURACY |
-S20 | SHT20 | ±0.3℃ | ±3-7% |
-S30 | SHT30 | ±0.3℃ | ±2-4.5% |
-S31 | SHT31 | ±0.3℃ | ±2% |
-S75 | SHT75 | ±0.3℃ | ±1.5-3% |
1.4TemperatureParameters(-S20)
CONTENT | Minimum | Typical value | Maximum | Unit |
Resolution(14bit) | - | 0.01 | - | ℃ |
Linear deviation | - | ±0.3 | Figure1 | ℃ |
Repeatability | - | ±0.1 | - | ℃ |
The scope of work | -40 | - | 125 | ℃ |
Response time (63%) | 5 | - | 30 | second |
Long-term drift | - | <0.04 | - | ℃/year |
Figure1Temperature measurement accuracy at different temperatures
As shown in the above table, the maximum deviation is within ±0.5 in the range of 5-60 degrees Celsius, and the deviation increases with less than 0 degrees Celsius and greater than 60 degrees Celsius.
1.5HumidityParameter(-S20)
CONTENT | Minimum | Typical value | Maximum | Unit |
Resolution(12bit) | - | 0.04 | - | %RH |
Linear deviation | - | ±3.0 | Figure2 | %RH |
Repeatability | - | ±0.1 | - | %RH |
The scope of work | 0 | - | 100 | %RH |
Response time (63%) | - | 8 | - | second |
Long-term drift | - | <0.5 | - | %RH /year |
Hysteresis | - | ±1 | - | %RH |
Non-linearity | - | <0.1 | - | %RH |
Figure2Humidity measurement accuracy under different humidity conditions
As shown in the above table, the deviation increases with a typical deviation of ±3% in the 20-80% RH range, less than 20%, and greater than 80% humidity.
1.6Influence of temperature on humidity measurement(-S20)
Figure2describes the effects of different humidity conditions on the humidity measurement. The following table describes the effects of different temperatures on the humidity measurement accuracy.
Figure3Relative humidity at different temperatures
As shown in the above table, in the range of 15 to 55 degrees Celsius and 30 to 80 degrees of humidity, the accuracy of humidity is the highest, which is ± 4.5%. In other cases, the humidity increases.
1.7System frame Diagram
FIGURE4SINGLE-ENDED
FIGURE5MUTIPLE-ENDED
ⅡHardware Connections
2.1 CHECKING BEFORE INSTALLATION
Check the list of devices before installation:
TABLE1Listof Devices
Name | Number |
THE SENSORDEVICE | 1 |
12V POWER ADAPTER(Optional) | 1 |
WARRANTY CARD /CERTIFICATE | 1 |
THEUSBTO485DEVICE(Optional) | 1 |
2.2 Interface Description
The power interface is wide voltage input 12-24V. When connecting the 485 signal cable, note that the A/B lines cannot be reversed. The addresses of multiple devices on the bus cannot conflict.
2.2.1Economic Sensor Wiring
FIGURE6PHYSICAL PICTURE
TABLE2Wiring Sequence
| Line Color | | Description |
Power | VCC | | Power supply Positive ( 12-24V DC ) |
GND | | Power supply Negative |
Communication | 485-A | | 485-A |
485-B | | 485-B |
Wiring method: After loosening the screw, insert the wire into the crimping hole from the terminal, and then tighten the screw to lock the wiring material.
2.2.2 LCD display shell wiring
FIGURE7PHYSICAL PICTURE
TABLE3Wiring Sequence
NO. | Instructions | NO. | Instructions |
1 | Power supply Positive(12-24VC) | 5 | 485-A |
2 | Power supply Negative | 6 | 485-B |
7 | SensorPower supply Positive | 3 | SCL |
8 | SensorPower supply Negative | 4 | SDA |
Note: When the sensor is built in, 3/4/7/8 is idle.
Use a screwdriver to press down on the yellow buckle. Insert the wire into the crimping hole and release the yellow buckle to lock the wire.
2.2.3External Probe Sensor Wiring
FIGURE8PHYSICAL PICTURE
TABLE4Wiring Sequence
| Line Color | | Description |
Power | Brown | | Power supply Positive ( 12-24V DC ) |
Black | | Power supply Negative |
Communication | Yellow | | 485-A |
Blue | | 485-B |
Precautions: Please take care not to take the wrong line sequence, the wrong wiring will cause the equipment to burn.
The factory default is to provide 0.6 meters long wire rods. Customers can extend the wire rods as required or sequentially.
Note that there are no yellow lines in the wire sequences that may be provided in some factory batches, in which case the gray line is equivalent to replacing the yellow line.
2.3Installation
The economical version of the sensor is in the form of a standard rail mount, which snaps the back side of the sensor onto the rail.
The 86-shell wall-mounted large-screen sensor adopts the installation form of the inverted hoist hole, and the customer can mount the screw with a distance of 60mm.
The wall-mounted king-shaped shell is a wall-mounted installation. The installation holes are located at the middle positions on both sides of the device. The installation aperture is less than 4mm, and the hole distance is 105mm. It can be installed using a 3mm self-tapping screw.
ⅢConfiguration Tool Installation and use
We provideCONFIGURATIONTOOL, which can be easily used totest oursensordevice.
3.1 Sensor Access Computer
Transmitter can be connected to PC with the RS485 to USB adapter. You can check theCOMport number through Device Manager (right click My Computer).
3.2How To Use Configuration Tool
Please note that this software can only test one device at the same time.After connecting the physical device, click theCONNECTbutton to read the information.In the UNCONNETstate, you can modify BAUD and ADDR inCOMMUNICATION SETTINGS.
Under the software, different check boxes can be selected according to different situations.For example, you can choose theGASoption to testthe RS485OXYGEN SENSOR,you can choose theNORMALoption to testthe RS485TEMPERATURE AND HUMIDITY SENSOR.
ⅣCommunication Protocol
4.1 Communication Basic Parameters
TABLE5Communication Basic Parameters
PARAMETERS | CONTENT |
Protocol | Modbus RTU |
Data bits | 8 bit |
Parity bit | No |
Stop bit | 1 bit |
Error checking | CRC (redundant loop code) |
Baud rate | 2400 bps/ 4800 bps/ 9600 bps can be set factory defaults to 9600 bps |
For more informationaboutMODBUS RTUplease visit the website"www.modbus.org".
4.2Register Address
Register Address | Plc Configuration Address | Content | Operation |
0000H | 40001 | Humidity(unit0.1%RH) | Read-Only |
0001H | 40002 | Temperature(unit0.1℃) | Read-Only |
0100H | 40101 | Device Address (0-252) | R/W |
0101H | 40102 | Baud Rate (2400/4800/9600) | R/W |
TABLE6Register Address
4.3Communication example
4.3.1 Read Device Address 0x01'sSoilTemperatureAndHumidity
TABLE7Inquiry Frame
Address Code | Function Code | Start Address | Data Length | CRC_L | CRC_H |
0x01 | 0x03 | 0x00,0x00 | 0x00,0x02 | 0xC4 | 0x0B |
TABLE8Answer Frames
`Address Code | Function Code | Number Of Valid Bytes | Humidity Value | Temperature Value | CRC_L | CRC_H |
0x01 | 0x03 | 0x04 | 0x02 0x92 | 0xFF 0x9B | 0x5A | 0x3D |
Temperature:
FF9BH( hexadecimal ) =-101=> temperature =-10.1℃
Humidity:
292H( hexadecimal ) =658=>humidity=65.8%RH