This is a smart rs485 temperature sensor. The housing of the Modbus temperature sensor is made of abs plastic with vents, and there is a slot on the back, which can be directly installed on the rail. sensor adopts standard Modbus-RTU communication protocol, supports Kingview, 3D force control, MCGS Kunlun configuration software configuration screen, PLC, user-developed platform.

Power supply (default): 10-30V DC
Power consumption: 0.3W
A precision: Humidity: ±2%RH (5%~95%RH, 25℃), temperature: ±0.4℃ (25℃)
B quasi-accuracy:(Default) Humidity: ±3%RH (5%RH~95%RH, 25°C), temperature: ±0.5°C (25°C)
Transmitter circuit working temperature: -40℃~+60℃, 0%RH~80%RH
Communication protocol: Modbus-RTU communication protocol
Output signal: 485 signal
Temperature display resolution: 0.1℃
Humidity display resolution: 0.1%RH
Temperature and humidity refresh time: 1S
Long-term stability: temperature ≤0.1℃/y humidity ≤1%RH/y
Response time: Temperature ≤15s (1m/s wind speed) Humidity ≤4s (1m/s wind speed)
Parameter setting: through software setting

Place of origin: China

Communication protocol

1. Basic communication parameters

2. Data frame format definition

Using Modbus-RTU communication protocol, the format is as follows:
Initial structure ≥4 bytes of time
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 function instruction of the command sent by the host, this transmitter only uses the function code 0x03 (read register data).
Data area: The data area is the specific communication data, pay attention to the high byte of the 16bits data first!
CRC code: two-byte check code.

Host query frame structure:

Slave response frame structure:

3. Register address

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4. Communication protocol example and explanation