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2g 3g 4g lte DTU modem with serial port rs232 TTL gsm fixed wireless terminal

Categories 2g/3g/4g dtu modems
Brand Name: thingsend
Model Number: XZ-DG4P
Place of Origin: China
MOQ: 1pc
Price: USD30/PC
Payment Terms: T/T, Western Union,Paypal
Supply Ability: 5000pcs/month
Delivery Time: 1-3working days
Packaging Details: standard
Interface: TTL/RS232
Type: 2g/3g/4g
Protocols: TCP/IP
Support: AT command
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2g 3g 4g lte DTU modem with serial port rs232 TTL gsm fixed wireless terminal

1)Main Features

Support 4G/3G/2G, Mobile, Telecom and China Unicom;

Bidirectional data transparent transmission between terminals TTL, RS485, RS232, and server;

Support user-defined registration packet and heartbeat ;

Standard TCP/IP communication interface Socket in Server ;

Intelligent anti disconnection, support online testing and online maintenance, disconnected then automatic redial, ensure that the equipment is always online;

Support configuration of the domain name, IP, port number, APN, serial port, baud rate and other parameters through serial port ;

Support remote configuration, remote firmware upgrade;

Support fixed IP and domain name DNS.

2)Technical Parameters

MinimumTypical ValueMaximum
Electrical Property (25℃)
Mains Voltage4.751236V
Working Current70150250mA
Peak Current--2000mA
Wireless Performance (25℃)
Frequency Range4G 3G 2G-
Max. Emission Power
EGSM900:+33dBm (Power Class 4)…
LTE:+23dBm(Power Class 3) …

General Performance
Interface Rate12009600115200bps
Interface LevelRS485,RS232,TTL
Working Temperature-4080
Dimension52×35×10 (not including antenna and accessories)mm


5)Using Method

5.1 TCP/IP connection

When XZ-DG4 works in the TCP/IP connection mode, data communication between XZ-DG4 and server is fully transparent transmission, to keep XZ-DG4 always online, users need to define the registered data frame and heartbeat data frame, and the server needs to differentiate the registered data frame and heartbeat data frame from user data frame. The server can also remotely set XZ-DG4's SDN or domain name.

5.1.1 Registered data frame:

The registered packet data type is 0x00, with a minimum load of 16 bytes. Users can freely add custom data , data is automatically added to the signal strength byte, and can set 70 bytes at most.

Frame headAddressTypeLoad LengthLoadCRC16 Calibration

Frame head: 0x24

Address: HEX,high byte is in the front

Type: 0x00: reporting IMSI (15 bytes) +CSQ (1 bytes)

Length: part data length, high byte is in the front;

Load: data content: the first 15 bytes are IMSI (ascll code) of SIM card, then 1 bytes is signal strength value RSSI (signed number) of GPRS, and the last one is user-defined registered package information.

CRC16 Calibration: start from frame head to data content, CRC-16 ($1021) check of all data;

1) CRCH: CRC16 checksum high 8 bit;

2) CRCL: CRC16 checksum high and low bit

5.1.2 heartbeat data frame:

The heartbeat packet sends one-byte data by default, and the data is 0x04. If it’s user-defined heartbeat packet, then one sends the user-defined heartbeat packet data, and the transmission interval is 40 seconds.

5.2 SMS function use

When XZ-DG4 works in SMS mode, XZ-DG4 can communicate with any mobile phone by SMS. When the mobile phone sends any message to XZ-DG4, XZ-DG4 from serial port sends out the current SMS content (only support up to 70 ASCII characters), if the terminal equipment returns data from serial port (only a maximum of 70 ASCII characters) XZ-DG4 will automatically reply the data to the mobile phone number from which it receives text messages last time.

Special customization requirements for SMS function is supported

6) Pin Definition

PinsDefinitionInput/outputFunction Description
1VCCInputPositive power supply (4.75V-36V)
2Rxd_TTL/232Input3.3V Serial port Input of TTL/RS232 Level
3Txd_TTL/232Output3.3V Serial port Input of TTL/RS232 Level
4GNDInputNegative power supply

7)AT Commands

Command DescriptionFormatParameters
Enter the AT command mode+++None(Enter and Return OK)
Set IP/SDN domain nameAT+SDN=1,[<SDN>,<port>,<num>][…][…]

<SDN>:Domain Name

<port>:Port No

<num>:Serial No. <1~5>

Remark:1 is on highest priority)

Delete IP/SDN domain nameAT+SDN=0,< num>

< num >:Serial No. 1~5: Specified Serial No.

A: Delete All

Set ID NumberAT+MODIDSET=1, <id><id>:DTU ID Decimal system
Set Serial Port ParametersAT+IPR=1,<bau>,<length>,<parity>,<stopbit>

<bau>:baud rate

0: 1200bps

1: 2400 bps

2: 4800 bps

3: 9600 bps (default)

4: 19200 bps

5: 38400 bps

6: 57600 bps

7: 115200 bps

<length>:data bits

8: 8 data bits

<parity>:parity check

N: no parity

O: odd parity

E: even parity

<stopbit>:stop bit

1: 1 bit

Add APN Configuration ItemAT+PROFILE=1,<SN>,<MCC+MNC>,<APN>,<Username>,<Password>

<SN>:Serial No. Set(1~8)

MCC:Mobile Country Code

MNC:Mobile Network Code

<APN>:Access Point

<Username>:user name


Delete APN Configuration ItemAT+PROFILE=0,<SN>

<SN>:Serial No. 1~8: Specified Serial No.

A: Delete All

Set add ID functionAT+ADDIDEN=1,<mode>

<mode>:Mode Selection

0:don’t add ID before transparent data transmission is the default

1:add ID before setting transparent data transmission

Set registered packet functionAT+REGPKT=1,<text><text>:registered packet content
Set heartbeat packet formatAT+HBTPKT=1,<text>

<text>:heartbeat packet content

Send once every 40s

Set SMS working modeAT+SMSTMODE=1,<mode>

<mode>: Trigger Mode

0: TCP/IP Mode

1: TXT transparent transmission mode

Query firmware version numberAT+FWV=?None
Quit AT Command ModeAT+QUITNone(if serial port is no operation, then quit automatically after 60s)

Welcome to contact Sarah if have any questions. sales(at)thingsend(dot)com.

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