Brief introduction
This product is a digital temperature and humidity transmitter, mainly used for temperature and humidity detection in the fields of pharmaceuticals, food industry, meteorological environment, museums, libraries, warehouses, computer rooms, engineering automation process monitoring, scientific research, etc.

2、 Main features
1. High security: Built in watchdog ensures reliable system operation.
2. Fully digital: Using original imported digital temperature and humidity IC, the measurement accuracy is consistent, stable and reliable.
3. Signal transmission: Using RS485 bus interface, it can achieve long-distance transmission and adopts standard MODBUS-RTU protocol.
4. Multiple installation forms are available: pipeline and wall mounted.

3、 Technical indicators
Response time: 3 seconds.
Maximum measurement range: temperature -40~+120 ℃, humidity 0~100% RH.
Accuracy: Temperature ± 0.5 ℃ @ 25 ℃, humidity ± 3% RH (if customers require higher accuracy, please contact our company).
Output signal: RS485。
Power supply voltage and power consumption: 24VDC, ≤ 0.5W.
Storage environment: -20~80 ℃; 5-90%, no condensation.

4、 Instrument model definition:

model	Installation method	temperature range
THT102	B： Wall Mount	A： Ordinary type:- 20 - 80℃
	G： Pipeline type	B： High temperature type:- 40 - 120℃

5、 The installation method and size diagram are as follows:






6、 Wiring instructions



7、 Parameter settings

Channel parameters
parameter	name	Value range	describe
CH	Front channel number	1 - 2	Channel number, 1 represents the temperature channel, 2 represents the humidity channel, and the "XX" parameter below represents the channel number. For example, Au01 represents the translation correction of the temperature channel, and Au02 represents the translation correction of the humidity channel.
AuXX	Translation correction	-999 – 9999	This parameter is used to correct the static error of the measurement, usually 0, and is only set when there are static errors and special requirements.
FiXX	filter coefficient	0 – 99	When the number jumps due to input interference, digital filtering can be used to smooth it out. Without any filtering, the larger the FiXX, the more stable the measured value, but the slower the response. Generally, when the measurement is subjected to significant interference, the FiXX value can be gradually increased to make the instantaneous fluctuation of the measurement value less than 2-5 words.
K XX	Slope coefficient	-0.999 – 2.000	Used to correct the slope of the measured value, the displayed value of the instrument is equal to the uncorrected measured value multiplied by K.
system parameter
Addr	Local address	0 – 252		When communicating, the address of the local device should be different from that of multiple devices; 253 "is a broadcast address, and" 254 "is a universal address.
bAud	Baud rate	2400、4800、9600、192b（19200）		The communication speed should be the same as the baud rate of the host (such as a PC) when communicating with multiple machines.
P_C2	System Password	0 - 9999		Used to enter the menu for parameter operations, the factory initial password is "2".
oFF	Input exception	0 – 2		0: The measured value is the maximum value (32751), 1: The measured value remains unchanged, 2: The measured value is the minimum value (-20000);
CHEC	Parity check	Null、 EvEn、odd		Null: Communication without parity check, EvEn: Communication even check, Odd: Communication odd check.