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USR-G781 User Manual Technical Support: h.usriot.com
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USR-G781 User Manual
File Version: V1.0.06.01
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Contents
USR-G781 User Manual ........................................................................................................................................1
Brief Introduction ............................................................................................................................................4
Features .............................................................................................................................................................4
1. Get Start .................................................................................................................................................................5
1.1. Application ................................................................................................................................................5
1.1.1. Application Diagram ....................................................................................................................5
1.1.2. Hardware Dimensions .................................................................................................................6
1.1.3. Hardware Interface ......................................................................................................................7
1.1.4. LED Indicator .................................................................................................................................8
1.2. Module Default Parameters ....................................................................................................................8
1.3. Basic Parameters .....................................................................................................................................9
1.4. Frequency Band......................................................................................................................................10
1.5. Hardware Introductions ........................................................................................................................10
2. Product Functions .............................................................................................................................................12
2.1. APN ...........................................................................................................................................................12
2.2. Router Functions ....................................................................................................................................12
2.2.1. Configuration procedure ...........................................................................................................12
2.2.2. Networking mode ........................................................................................................................13
2.2.2.1. WAN+LAN+4G ...................................................................................................................13
2.2.2.2. LAN+LAN+4G ....................................................................................................................14
2.2.3. Features ........................................................................................................................................14
2.2.3.1. 4G Interface ......................................................................................................................14
2.2.3.2. LAN Interface ...................................................................................................................15
2.2.3.3. WAN Interface ..................................................................................................................15
2.2.3.4. DHCP ..................................................................................................................................15
2.2.3.5. VPN .....................................................................................................................................15
2.2.3.6. Static Routing function ....................................................................................................15
2.2.3.7. Static IP binding................................................................................................................15
2.2.3.8. Network diagnosis ...........................................................................................................15
2.2.3.9. Firewall ..............................................................................................................................15
2.3. DTU Functions ........................................................................................................................................15
2.3.1. Work Mode ...................................................................................................................................16
2.3.1.1. Transparent Mode ...........................................................................................................16
2.3.1.2. HTTPD Client Mode .........................................................................................................17
2.3.2. Serial Port ....................................................................................................................................18
2.3.2.1. Parameters range ............................................................................................................18
2.3.2.2. Serial Package Methods ..................................................................................................18
2.3.2.3. Baud Rate Synchronization ............................................................................................19
2.3.3. Features ........................................................................................................................................19
2.3.3.1. Identity Package Function ..............................................................................................19
2.3.3.2. Heartbeat Package Function .........................................................................................20
2.4. Basic functions........................................................................................................................................20
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2.4.1. Reload by Hardware ...................................................................................................................20
3. Parameter Setting..............................................................................................................................................21
3.1. Webpage Configuration ........................................................................................................................21
3.2. AT Command ...........................................................................................................................................22
3.2.1. Serial AT Command ....................................................................................................................22
3.2.2. Setup software .............................................................................................................................22
3.2.3. Transparent AT Command ........................................................................................................22
4. Contact Us ............................................................................................................................................................23
5. Disclaimer ...........................................................................................................................................................23
6. Update History ...................................................................................................................................................23
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Brief Introduction
USR-G781 is a 3G&4G DTU which apply to LTE WCDMA and GPRS. Serial RS232 or RS485 can be transfer to
Internet server via LTE technology. G781 has two Ethernet port for networking accessory.
Features
ARM 9 core and Linux system based.
Supports 2G 3G and 4G LTE. Different version for America, Europe, Australia and other areas.
Support 2 Ethernet RJ45 port. One LAN port, and another one can be set as WAN port or LAN port.
Support 1 SIM card socket.
Support PPTP VPN. LT2P, IPSEC and Open VPN are on developing.
Support DDNS, static routing and firewall.
Support NTP and clock synchronization.
Support Webpage configuration.
Supports 4 connections online simultaneously, supports TCP and UDP
Supports sending network identity packet.
Supports sending heartbeat packet data to network or serial port
Supports 2 serial work modes: Network transparent transmission mode and HTTPD mode
Dual watchdog timer for stability.
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1. Get Start
Product link:
http://www.usriot.com/p/g781/
Setup software:
http://www.usriot.com/usr-g781-setup-software-v1-0-0-0/
Figure 1 Download Page
If you have any question, please submit it back to customer center: http://h.usriot.com
1.1. Application
1.1.1. Application Diagram
When you start using module, the first step is to configure APN settings.
2.1. APN is chapter for APN settings.
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Figure 2 Application diagram
1.1.2. Hardware Dimensions
units: mm
Figure 3 Hardware dimensions
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1.1.3. Hardware Interface
Figure 4 Hardware interface
Figure 5 Hardware interface
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Interface
Information
LTE antenna
Stick antenna and sucker antenna for chosen
Reload button
Press button for 3~15s to reload to factory settings
Ethernet port
WAN/LAN port can be switch by serial command
Power supply
DC 9~36V power supply
RS232 DB9
female
5 wires RS232(TXD/RXD/GND/RTS/CTS)
RS485 terminal
3 wires RS485: A+/B-/GND
SIM card socket
Insert SIM card here
Figure 6 Interface information
1.1.4. LED Indicator
Indicator
Status
Power
On: Power on
Off: Power off
NET
Red: 2G network
Blue: 3G network
Purple: 4G network
Off: No network
WORK
On: Working
Off: Not working
SIM
On: SIM card detected
Off: SIM card not detected
LINKA
On: Socket A connected
Off: Socket A disconnected
LINKB
On: Socket B connected
Off: Socket B disconnected
TXD
On: Sending data to serial
Off: No data sending to serial
RXD
On: Receiving data from serial
Off: No data receiving from serial
Figure 7 Hardware Indicator
1.2. Module Default Parameters
Work mode
Transparent mode
Server Address
test.usr.cn
Server Port
2317
Serial Parameters
115200,8,1,None
Heartbeat Package
www.usr.cn
Figure 8 Default parameters
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1.3. Basic Parameters
Parameter
Index
SIM card and antenna
SIM/USIM card
Six pin SIM card interface, 3V/1.8V SIM card
Antenna
SMA interface, 5dBi antenna
Hardware Parameters
Wired Internet interface
WAN*1 and LAN*1
Data Interface
RS232:300bps - 460800bps
RS485:300bps - 460800bps
Indicator LED
LINKA, LINKB, TXD, RXD, POWER, NET, WORK, SIM
Working Voltage
DC 9V~36V
Working Current
Average current 180mA@12V
Peak Current 300mA@12V
Working Temp.
-25℃- 85℃
Storage Temp.
-40℃- 125℃
Working humidity
10%~90%
Storage humidity
5%~90%
Software Parameters
Work Mode
Transparent Mode, HTTPD Client Mode
Setting Command
AT+ Command Structure
Network protocol
TCP/UDPDNS/HTTP/FTP
Max TCP connections
4
User Configuration Method
Setting Software,AT command and Webpage
configuration
Software Functions
VPN
Support PPTP
Static routing management
Support
Firewall
Support
Network diagnosis
Support
Remote Management
Support
Transparent Transmission
Support TCP Server/TCP Client/UDP Server/UDP Client
HTTP Protocol
Transmission
Support
Heartbeat Packet
Support
Identity Packet
Support IMEI/ICCID/self-defined identity packet
Baud Rate Synchronization
Support
USR Cloud
Support
Figure 9 Basic parameters
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1.4. Frequency Band
G806
G806-43
G806-E
G806-V
G806-A
G806-AU
Operating
Band
Operatin
g Band
Operatin
g Band
Operatin
g Band
Operatin
g Band
Operatin
g Band
FDD-LTE
1 1 1 1 2
2
3 3 3 3 4 4 4 5 5 7 7 8 8 8 12
13
20
28
TDD-LTE
38
38
38
39
39
40
40
40
40
41
41
41
WCDMA
1 1 1
1
2
2
4 5 5 5 8 8 8
8
CDMA1X
800MHz
CDMA2000-EVDO
GPRS
2 3 3 3 3 8 8 8 5
8
Figure 10 Frequency Band
1.5. Hardware Introductions
Below is the hardware interface schematic diagram of USR-G781
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Figure 11 Hardware interface schematic diagram
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2. Product Functions
2.1. APN
Different operator have different APN(access point name), if you use the SIM card from the operator. You must
know the APN. You can ask your SIM card operator for APN.
There are three parameters about APN. Those are APN, username and password. Sometimes only configure APN
is enough.
2.2. Router Functions
This chapter introduces the Router functions of USR-G781, as the following diagram shown, you can get an overall
knowledge of it.
Network
Devices
Serial port
Devices
LAN Interface
Serial port
Reload
Power Supply
USR-G781
4G
WAN
Interface
wired
network
Operator
Network
Figure 12 Router Functions diagram
2.2.1. Configuration procedure
Basic procedure as follows:
Step1: Keep G781 in power off condition.
Step2: Insert SIM card.
Step3: Connect antenna.
Step4: Power the G781.
Step5: Wait about one minute, NET LED light with purple, G781 can connect to 4G network.
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Connection diagram as follow:
Figure 13 Application diagram
User can access network through G781. PC connect to G781 by LAN interface and PC should open DHCP function.
2.2.2. Networking mode
2.2.2.1. WAN+LAN+4G
Diagram as follows:
Figure 14 WAN+LAN+4G Application diagram
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In this mode, users can connect to Internet through WAN or 4G. Default configuration is WAN has higher priority.
When router can’t connect Internet through WAN, it will change to 4G network.
2.2.2.2. LAN+LAN+4G
Diagram as follows:
Figure 15 LAN+LAN+4G Application diagram
In this mode, two devices can connect to router through LAN and access the Internet by 4G network.
2.2.3. Features
2.2.3.1. 4G Interface
G781 support one 4G interface to connect Internet. Functional diagram as follows:
Internet
4G Interface
ETH2
Remote monitoring/
upgrading
Network
Selection(2G/3G/4G)
APN settings
Status(Run
time, IP and
flow)
G781
Figure 16 4G Interface
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2.2.3.2. LAN Interface
When user set WAN/LAN interface into LAN mode, G781 will have two LAN interface.
Default settings: Static IP address: 192.168.1.1; Subnet mask: 255.255.255.0; Open DHCP function.
2.2.3.3. WAN Interface
G781 has one WAN interface. Support DHCP and static IP, default setting is DHCP.
2.2.3.4. DHCP
DHCP default range of distribution from 192.168.1.100 to 192.168.1.254 and default address lease time is 86400
seconds (ten days). Range and lease time can be change.
2.2.3.5. VPN
G781 only support PPTP mode to achieve VPN function.
2.2.3.6. Static Routing function
User can set G781 static routing table to achieve self-defined routing rules.
2.2.3.7. Static IP binding
User can bind IP address with MAC address and G781 will distribute fixed IP address to some devices.
2.2.3.8. Network diagnosis
User can use ping a specified address to check the connection status.
2.2.3.9. Firewall
User can set firewall filtering tables rules and forwarding tables rules to manage Network security.
2.3. DTU Functions
This chapter introduces the DTU functions of USR-G781, as the following diagram shown, you can get an overall
knowledge of it.
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Serial
Port
Device
Network
UART frame
Transparent Transmission Mode
Socket A
Socket B
Socket C
Socket D
TCPS/TCPC/UDPS/UDPC
TCPC/UDPS/UDPC
TCPC/UDPS/UDPC
TCPC/UDPS/UDPC
Identity
Packet
Heartbeat
Packet
HTTPD Mode
HTTP Package/Prase HTTP POST/GET
AT Command Mode
Serial AT command
Parameter
Query/Set
Network AT command
SMS AT command
Figure 17 DTU functions diagram
2.3.1. Work Mode
2.3.1.1. Transparent Mode
Transparent Mode: What you sent to serial will be forward to network. The communication is bidirectional.
Figure 18 Transparent Mode
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Serial Device G781 TCP/UDP Server
Send ABC Send ABC
Send 123 Send 123
Figure 19 Transparent mode diagram
<Illustration>:
USR-G781 supports 4 socket connections simultaneously: socket A, socket B, socket C and socket D, they are
independent. Socket A supports TCP Server, TCP Client, UDP Server and UDP Client. Socket B, socket C and socket
D support TCP Client, UDP Server and UDP Client.
2.3.1.2. HTTPD Client Mode
HTTPD Client Mode: DTU will add the HTTP Header for every data from serial and transfer HTTP format data to
Network. User needs to configure the HTTP Header before use this mode. User can use this mode transfer the
serial data to HTTP server.
Figure 20 HTTPD Client Mode
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Serial Device G781 HTTP Server
SEND=ABC
GET/1.php?SEND=ABC HTTP/1.1
Host: www.abc.cn
Accept: text/html
Accept-Language: zh-CN
User-Agent: Mozilla/5.0
Connection: Keep-Alive
RECV=ABC
HTTP/1.1 200 OK
Data: Wed, 24 Jun 2015 04:08:35 GMT
Content-Length: 19
Keep-Alive: timeout=15, max=99
Connection: Keep-Alive
Content-Type: text/html
RECV=ABC
Figure 21 HTTPD Client Mode Diagram
2.3.2. Serial Port
2.3.2.1. Parameters range
Items
Parameters
Baud Rate
300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200,
230400, 460800
Data Bits
7,8
Stop Bits
1,2
Parity
NONE
EVEN
ODD
Flow Control/485
NFC: None Flow Control
485:When you use RS485, please choose this function
Figure 22 Serial parameters
2.3.2.2. Serial Package Methods
For network speed is faster than serial. Module will put serial data in buffer before sending it to network. The data
will be sent to Network as Package. There are 2 ways to end the package and send package to network - Time and
Length.
2.3.2.2.1. Time Trigger Mode
If no data get from serial over the time threshold, it will end the package and send this package to network. The
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range of threshold is from 10ms ~ 60000ms. Default is 50ms. If the serial keeping send data, this package will be
1K bytes.
2.3.2.2.2. Length Trigger Mode
The package will be sent to network when it up to length threshold. The range of length threshold is from 1 to
4096 bytes. Default is 1000 bytes.
2.3.2.3. Baud Rate Synchronization
When module works with USR devices or software, serial parameter will change dynamically according to
network protocol. Customer can modify serial parameter by sending data conformed to specific protocol via
network. It is temporary, when restart DTU, the parameters back to original parameters.
2.3.3. Features
2.3.3.1. Identity Package Function
Figure 23 Identity Package
Identity Package is used for identify the device when module works as TCP client/UDP client. There are two
methods for identity Package.
Identity data will be sent when connection is established. (Only for TCP client)
Identity data will be add on the front of every data package. (TCP client and UDP client)
Type of identity data: ICCID, IMEI, CLOUD and USER.
ICCID, the unique identifier of SIM card, suitable to the application based on SIM card identification.
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IMEI, the unique identifier of DTU, suitable to the application based on device identification.
CLOUD, the identification code based on USR CLOUD platform. For more information about USR Cloud,
please go to cloud.usr.cn/en/
USER, You can use your own identity data.
2.3.3.2. Heartbeat Package Function
Heartbeat Package: Module will output heartbeat data to serial or network periodic. User can configure the
heartbeat data and time interval. Serial heartbeat data can be used for polling Modbus data. Network heartbeat
data can be used for showing connection status and keep the connection.
Heartbeat Package is only in transparent mode.
2.4. Basic functions
2.4.1. Reload by Hardware
User default settings: User can save the settings as User default settings.
Pressed Reload button for 3~15 seconds, USR-G781 will reload user default settings.
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3. Parameter Setting
There are two ways to configure USR-G781. They are webpage configuration and AT command. Webpage
configuration mainly configure router functions and AT commands mainly configure DTU functions. We also
provide the setup software based on serial AT command. You can download the setup software in our website
http://www.usriot.com/p/4g-lte-modem-router/.
3.1. Webpage Configuration
User can connect PC to G781 through LAN interface and set PC as DHCP. Then enter webpage to configure.
Webpage default parameters as follows:
Parameter
Default settings
Webpage IP address
192.168.1.1
User name
Admin
Password
Admin
Figure 24 Webpage default parameters
After connecting PC to G781, user can open browser and enter 192.168.1.1 into address bar, then log in user
name and password, user will enter into webpage. Webpage screenshot as follow:
Figure 25 Webpage configuration
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3.2. AT Command
3.2.1. Serial AT Command
In transparent mode, SMS mode and HTTPD mode, you can enter AT command mode. Then you can send AT
command to module. Setup software is based on this function. For entering AT command mode, please refer to
this FAQ: http://www.usriot.com/enter-serial-command-mode/.
3.2.2. Setup software
We also provide the setup software based on serial AT command. You can download the setup software in our
website http://www.usriot.com/p/4g-lte-modem-router/. Software screenshot as follow:
Figure 26 Setup software
3.2.3. Transparent AT Command
When module in transparent mode, you can use “Password,AT command” format to send AT command via serial
or network. If you use transparent AT command, you needn’t enter AT command mode.
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4. Contact Us
Company: Jinan USR IOT Technology Limited
Address: Floor 11, Building 1, No. 1166 Xinluo Street, Gaoxin District, Jinan, Shandong, 250101, China
Web: www.usriot.com
Support: h.usriot.com
Email: sales@usr.cn
Tel: 86-531-88826739/86-531-55507297
5. Disclaimer
This document provide the information of USR-G781 products, it hasn’t been granted any intellectual property
license by forbidding speak or other ways either explicitly or implicitly. Except the duty declared in sales terms
and conditions, we don’t take any other responsibilities. We don’t warrant the products sales and use explicitly or
implicitly, including particular purpose merchantability and marketability, the tort liability of any other patent
right, copyright, intellectual property right. We may modify specification and description at any time without
prior notice.
6. Update History
2017-07-25 V1.0.06.01 Established
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