Overview 1 Overview The DT300 is integrated temperature & humidity sensor. The temperature part use DS18B20. The humidity part use capacitance element.   It is compact design with small dimension and easy for installation. It is applicable for home, industrial room, greenhouse, cabinet and other cases.. Furthermore, it is applicable for customized design, such as different mechanic structure, measurement range, and other OEM/ODM business.  Specification 2 Specification  

Measurement Range	-40~120℃, 0~100%RH
Resolution	±0.5℃,±3%RH
Drift per year	±1%FS
Power Supply	12-24V DC
Output Signal	0-5V/4-20mA/RS485
Working Environment	-40 ~ 85℃, 5~95%RH
Protection Rank	IP65
Mounting	Wall Mounting
Wireless	Optional for zigbee, wifi, GPRS, 3G(UMTS).
Dimension	110X85X42mm
Weight	150g (standard version)

Interface Definition 3 Interface Definition  3.1 Voltage Output   Pin 1: Red Line: V+,  Pin 2: Black Line: GND Pin 3: Yellow Line: Humidity Pin 4: Blue Line: Temperature    3.2 Current Output    Pin 1: Red Line: V+,  Pin 2: Black Line: GND Pin 3: Yellow Line: Humidity Pin 4: Blue Line: Temperature   3.3 RS232/485 Output Pin 1: Red Line: V+,  Pin 2: Blue Line: RS485 A+/ RS232 TX Pin 3: Black Line: GND Pin 4: Yellow Line: RS485 B-/ RS232 RX  4 Naming Rules & Clarification  

DT300	Temperature & Humidity Sensor
		Output
		A	4~20mA
		V	0~5V
		D	RS485
		C	RS232
			Wireless
			W	Wifi
			Z	zigbee
			G	GPRS
			U	3G(UMTS)

  5.Protocol 1. Com Port Setting
Baudrate:9600/115200
Data bit:8
Stop bit:1
Check Sum:None
; is reserved for this protocol, it is specially used to splitter for the
parameter. In user data, it should not be used as parameter.
2 Packet Format
Header/Tail
Header 1 byte,$ in ascii and in hex 0x24 for the request to sensor.And *
in ascii and in hex 0x2A for the reply from sensor. Tail 2 byte, in hex
0x0D 0A.
Command
Refer to command list at Part 3. For command in reply is same as the
command in request.
ID
01~FF
Content 0~32 bytes.
Checksum
Sum of bytes from header to id, then select the low 8 bit, finally convert
to ASCII and show in Hex. E.g. If sum is 0x0356, then low 8 bit is 0x56,
to ascii, the value is 56(0x35 0x36 in Hex).
Example:
$RA0118 ReadAir Level
In hex 0x 24 52 41 30 31 31 38 0D 0A
0x 24 + 52 + 41 +30 + 31 = 0x 118 , the low byte is 0x18, then
checksum is 18 in ascii, in hex 0x31 38.
$SI0100000142 Set ID to 01
0x 24 53 49 30 31 30 30 30 30 30 31 0D 0A
0x24 + 53+ 49+30+31+30+30+30+30+30+31=0x242, checksum is
ascii 42, in hex 0x34 32.
Notes: For the automatic update version, the sensor automatically
upload in command RT and RH format. 3 Command List
Command Function
Standard Version
RT  Read Temperature
RH  Read Humidity

SI Set ID
Automatic Upload Version
RT Automatic upload Temperature
RH Automatic upload Humidity
GPRS/3G version
AP Set APN
WIFI Version
SD Set SSID
PL Set Protocol
SP Set Server and port
4 Detailed Command
4.1 Read Temperature
Request from computer to sensor:
ASCII : $RT012B
Hex: 24 52 54 30 31 32 42 0D 0A
Reply from sensor:
ASCII : *RT01018.505D
Example:
ID: 01
Temperature: 018.50, unit ℃

4.2 Read Humidity
Request from computer to sensor:
ASCII : $RH011F
Hex: 24 52 48 30 31 31 46 0D 0A
Reply from sensor:
ASCII : *RH01066.965E
Example:
ID: 01
Humidity: 066.96, unit %
4.3 Set ID
Request from computer to sensor:
ASCII : $SI0100000142
Hex : 24 53 49 30 31 30 30 30 30 30 31 34 32
0D 0A
Reply from sensor:
*SI01OKOKOKEF
01 is sensor id, 00 is filler to reach 6 bytes, 01 is the new id, id range is
00~FF.

4.4 Set APN
Request from computer to sensor:
ASCII : $AP01UNINET;;;9A
Hex : 24 41 50 30 31 55 4E 49 4E 45 54 3B 3B 3B 30 30 0D 0A
Reply from sensor:
*AP01OKOKOKFA
01 is sensor id, uninet is theAPN, user name blank, password blank. The ;
is symbol to split theAPN, user and password.
*************************** WIFI Version **************************
4.5 Set SSID
Request from computer to sensor:
ASCII : $SD01Dingtek;12345678;FC
Hex : 24 53 44 30 31 44 69 6E 67 74 65 6B 3B
31 32 33 34 35 36 37 38 3B 46 43 0D 0A
Reply from sensor:
*SD01OKOKOKF0
01 is sensor id,Dingtek is the SSID, 12345678 is the password, ; is the
splitter.
4.6 Set Protocol
Request from computer to sensor:
ASCII : $PL01TCP;43
Hex : 24 50 4C 30 31 54 43 50 3B 34 33 0D 0A
Reply from sensor:
*PL01OKOKOKF5
01 is sensor id,TCP is the protocol, currently, only TCP and UDP is
available.
4.7 Set Server and port
Request from computer to sensor:
ASCII : $SP01192.168.1.1;8080;95
Hex :24 53 50 30 31 31 39 32 2E 31 36 38 2E
31 2E 31 3B 38 30 38 30 3B 39 35 0D 0A
Reply from sensor:
*SP01OKOKOKFC
01 is sensor id, 192.168.1.1 is server ip, 8080 is port. ; is the splitter.