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+--- Thread: RS485 Temperature and Humidity Sensor Modbus RTU (/showthread.php?tid=6598)
RS485 Temperature and Humidity Sensor Modbus RTU - Trapasin - 09-04-2024
RS485 Temperature and Humidity Sensor Modbus RTU Use By SHT30
https://shop.kincony.com/products/rs485-temperature-and-humidity-sensor-modbus-rtu-use-by-sht30
Please tell me the parameters of the Sensor to connect it to the controller via the MODBUS bus
1. Device address: What is the default address, how can it be changed?
2. Data transfer rate (Baud Rate)
3. Number of stop bits
4. Number of data bits
5. Parity
6. Transfer type: RTU or ASCII
7. Bus type: I use 4 wires: RS-485
8. Timeouts and delays: which are preferable for it?
RE: RS485 Temperature and Humidity Sensor Modbus RTU - admin - 09-04-2024
1. Device address: What is the default address, how can it be changed? --> default is 1, you can change address by PC software.
2. Data transfer rate (Baud Rate) --> default 9600bps, 4800/9600/14400/19200/38400/56000/57600/115200bps can be set by PC software.
3. Number of stop bits --> 1 bit
4. Number of data bits --> 8 bit
5. Parity --> None
6. Transfer type: RTU or ASCII -->RTU
7. Bus type: I use 4 wires: RS-485 --> RS485 A and B
8. Timeouts and delays: which are preferable for it? you can use modbus pull to test it.
here is PC software download:
RS485-Temperature-PC-software.zip (Size: 4.08 MB / Downloads: 48)
RE: RS485 Temperature and Humidity Sensor Modbus RTU - Trapasin - 09-05-2024
Thanks for the answers!
Tell me, what is the RESET button on the sensor board for? How to use it and what functions does it have?
RE: RS485 Temperature and Humidity Sensor Modbus RTU - admin - 09-05-2024
it's just CPU's reset button. usually not need to use it.
RE: RS485 Temperature and Humidity Sensor Modbus RTU - Trapasin - 09-06-2024
Hello!
Give me please table of MODBUS registers for this device. I need add it to my controller and setup reading value of temp and humidity
Thank you!
RE: RS485 Temperature and Humidity Sensor Modbus RTU - admin - 09-07-2024
A. input register function:
temperature : 16bit unsigned integer register
humidity: 16bit unsigned integer register
address function
0000H temperature value
unit: ℃
fixed 1 decimal
(1) >0℃: register data<10000
for example: register value=250, actual temperature: 250*0.1=25℃
(2) <0℃: register data>=10000
for example: register value=10250, actual temperature: -1*(10250-10000)*0.1=25℃
------------------------------------
0001H humidity value
unit: %RH
fixed 1 decimal
for example: register value=500, actual humidity: 500*0.1=50(%RH)
------------------------------------
0002H temperature value
0003H unit: ℃ decode: 32bit float data
------------------------------------
0004H humidity value
0005H unit: %RH decode: 32bit float data
B. Hold register function:
The contents of the register are saved when power is turned off. The holding register is a readable and writable register. The value in each register is a 16-bit unsigned integer.
address function
0000H temperature value
unit: ℃
fixed 1 decimal
(1) >0℃: register data<10000
for example: register value=250, actual temperature: 250*0.1=25℃
(2) <0℃: register data>=10000
for example: register value=10250, actual temperature: -1*(10250-10000)*0.1=25℃
------------------------------------
0001H humidity value
unit: %RH
fixed 1 decimal
for example: register value=500, actual humidity: 500*0.1=50(%RH)
------------------------------------
0002H temperature value
0003H unit: ℃ decode: 32bit float data
------------------------------------
0004H humidity value
0005H unit: %RH decode: 32bit float data
------------------------------------
000AH RS485 bus address(1-255), default:1
Note: This parameter is saved after power-off and will take effect after power-on again after modification.
------------------------------------
000BH Baud rate setting:
0:4800 1:9600(default) 2:14400 3:19200 4:38400 5:56000 6:57600 7:115200
Note: This parameter is saved after power-off and will take effect after power-on again after modification.
------------------------------------
003DH Parity settings
0:None(default) 1:odd parity 2:even parity
Note: This parameter is saved after power-off and will take effect after power-on again after modification.
RS485-temperature-humidity-sensor-modbus-protocol.txt (Size: 2.72 KB / Downloads: 36)
RE: RS485 Temperature and Humidity Sensor Modbus RTU - Trapasin - 10-15-2024
Hello!
How I can reset it to default settings?
I forget address and con not connect software to sensor
RE: RS485 Temperature and Humidity Sensor Modbus RTU - admin - 10-15-2024
Parameter reset method: There is a reset button inside the module. When powered on, press and hold for about 4 seconds to turn off the power, wait for about 5 seconds, and then power on again to restore the factory settings, address will be 1