DTU Data in PROT mode
DTU sends three types of data packets to data center in total when working in PORT mode：the registration packet when first regist,the data packet that including application data,the heartbeat packet that maintain links.The format description of three types of packets as follow:
4 bytes 11 bytes 1 byte 4 bytes 1 byte
ID: 8 bits of HEXID number
PHONE_NUMBER: 11 bits of ASCII code of mobile phone number.
IP_ADD: Dynamic IP address(HEX)
ETX: 0x00 means the end of the data。
For Example: 78 56 34 12 31 33 30 36 36 36 36 38 38 38 38 00 c0 a8 01 42 00
Analytic as follows:
78 56 34 12 Means ID number is: 0x78563412 (4 byte in total)
31 33 30 36 36 36 36 38 38 38 38 Means mobile phone number is：13066668888
c0 a8 01 42 Means IP address is：192.168.1.66
According to your configuration of data center IP and port, DTU will connect to data center automatic after power on. Once TCP link establish success, DTU will send first registration packet that including the basic information of DTU, then it will send data packet of application and heartbeat packet that maintain link.
In the mode of PROT,It will go on data changing when DTU send data and receive data form data center,the data changing role as follow:
In order to maintain links, DTU will send 1 byte hearthbeat packet to data center periodic:0xfe
This byte data has been filtered in the dynamic library that we provide.
Note：After DTU login in the data center software.Sending character string “***COMMIT CONFIG***” by using data center software, DTU will enter remote configuration state. Then we can set the DTU configuration by sending AT commands remotely.
More To Know:
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