USR IOT USR-G809 User manual

User Manual of OpenCPU
www.pusr.com
1
Your Trustworthy Industrial IoT Partner
USR-G809 OpenCPU User Manual
Build aSmarter IoT world, Your Trustworthy Partner

User Manual of OpenCPU
www.pusr.com
- 1 -
Your Trustworthy Industrial IoT Partner
Content
1. Brief introduction of USR-G809....................................................................................................................- 2 -
1.1. Hardware specification.......................................................................................................................- 2 -
1.2. Interface............................................................................................................................................- 4 -
1.3. Hardware resources...........................................................................................................................- 4 -
1.3.1. The description of indicator lights..............................................................................................- 4 -
1.3.2. LED pin definitions....................................................................................................................- 5 -
1.3.3. Terminal definitions..................................................................................................................- 5 -
1.3.4. Digital_IO definitions.................................................................................................................- 6 -
1.3.5. LTE module pin definitions........................................................................................................- 6 -
1.3.6. UART........................................................................................................................................- 6 -
2. Environment preparation............................................................................................................................- 6 -
3. SDK Configuration ......................................................................................................................................- 7 -
3.1. Configuration file ...............................................................................................................................- 7 -
3.1.1. Use the configuration file provided by USR .................................................................................- 7 -
3.1.2. Custom configurations ..............................................................................................................- 7 -
4. Firmware compilation.................................................................................................................................- 8 -
5. Firmware flashing ......................................................................................................................................- 8 -
5.1. Firmware flashing via uboot...............................................................................................................- 8 -
6. SDK Introduction ......................................................................................................................................- 11 -
6.1. OpenWrt Source Code Directory Introduction： .................................................................................- 11 -
6.2. SDK Introduction of USR-G809 .........................................................................................................- 11 -
6.3. Introduction of USR demo program:.................................................................................................- 13 -
6.3.1. DTU demo program.................................................................................................................- 13 -
6.3.2. Dialnet dialing demo program................................................................................................- 17 -
6.3.3. USB mounting........................................................................................................................ - 24 -
6.3.4. Instruction of digital_io program(package/USR/utils/usr_digital_io)........................................- 26 -
6.4. Explanation of modifications based on OpenWrt..............................................................................- 29 -
6.4.1. target/linux/ramips/image/mt7620.mk ..................................................................................- 29 -
6.4.2. Explanation of modifications of dts file ...................................................................................- 29 -
7. How to add apackage (using libusrdtu as an example) ............................................................................. - 30 -
7.1. Analysis of file structure....................................................................................................................- 31 -

User Manual of OpenCPU
www.pusr.com
- 2 -
Your Trustworthy Industrial IoT Partner
1. Brief introduction of USR-G809
USR-G809 is an industrial 4G router gateway that integrates 4G LTE, DIDO, serial, Ethernet ports (4LAN and
1WAN), and other interfaces. It combines 4G router, serial server, and IO control, making it a fully featured LTE router
designed specifically for mission-critical IIoT applications.
1.1. Hardware specification
Hardware Specifications
Cellular
Interface
Antenna
2 x SMA-K
Note: North America models: 2 x SMA 4G antenna connectors.
SIM card
1 x (3 V & 1.8 V) Standard 2FF SIM, drawer-type sim card slots
Ethernet
1 x WAN port 10/100 Mbps, compliance with IEEE 802.3, supports auto MDI/MDIX,1.5KV network
isolation transformer protection
4 x LAN ports, 10/100 Mbps, compliance with IEEE 802.3, IEEE 802.3u standards, supports auto
MDI/MDIX,1.5KV network isolation transformer protection
Indicators
LED
PWR: red, always on after powered on
Work: green, blinking when the router is ready and working properly
WLAN: green, always solid on when Wi-Fi is enabled and working
properly
USR: user defined.
Net indicator:
Red always on after connected to 2G network
Green always on after connected to 3G network
Orange always on after connected to 4G network
Signal strength：3 solid bars, strongest signal
Terminal block
Pinout
V+,V- : 2 cores terminal power supply socket, built-in power supply
phase-reversal protection
GND: ground terminal
Tx/B:RS-232/RS485 pin（setup by software）
Rx/A:RS-232/RS485 pin（setup by software）
DI:2 x Digital input, passive switch
DO:2 x Digital open collector output, max output 36 V, 300 mA
COM: common terminal, use in conjunction with DOs
Wi-Fi Interface
Standards & Frequency
IEEE 802.11b/g/n,2.4GHz, AP mode
Data speed
IEEE 802.11b/g, maximum 54Mbps.IEEE 802.11n, maximum 150Mbps
Antenna
2 x RP-SMA-K
Transmission distance
80 meters by line of sight. Actual transmission distance depends on
environment of the site.
Power Supply
Adaptor
DC 12V/1A
Connector
DC Power Jack Barrel Type Female 5.5*2.1mm Round socket or industrial
terminal block, reverse polarity protection
Input voltage
DC 9~36V

User Manual of OpenCPU
www.pusr.com
- 3 -
Your Trustworthy Industrial IoT Partner
Working power
Average 522mA/12V, Maximum 811mA/12V
Serial Interface
RS485/RS232(alternative)
industrial terminal block.
Note:RS232 default.
Baud rate(bps)
1200,2400,4800,9600,19200,38400,57600,115200,230400
Data bits
8
Stop bits
1,2
Parity
NONE,ODD,EVEN
Physical
Characteristics
Housing
Metal shell,IP30
Dimensions
125.0*103.0*45.0mm (L*W*H, antenna pedestal, terminal block and DIN
Rail are not included)
Installation method
Ear mounting, DIN-Rail mounting
EMC
Static IEC61000-4-2, level 3
Pulsed Electric Field IEC61000-4-4, level 3
Surge IEC61000-4-5, level 3
Operating temperature
-20℃～+70℃
Storage temperature
-40℃～+125℃
Operating humidity
5%～95%RH（non-condensing）
Others
Reload
Pinhole button, restore factory defaults/firmware resume/firmware
upgrading with USB
TBD
Debug interface (TTL Level)
USB
Firmware upgrading
TF
TF card slot
Ground protection
Screw
Embedded Watchdog
Device runs self-detection, auto recovers from malfunctions
Certificate
CE
1.2. Download SDK
SDK download: https://github.com/JinanUSR-IOT/openwrt

User Manual of OpenCPU
www.pusr.com
- 4 -
Your Trustworthy Industrial IoT Partner
1.3. Interface
1.4. Hardware resources
1>The main control chip is MT7620A, with 128M memory and 32M storage.
2>It has 1*100M WAN port, 4*100M LAN ports, and supports 5G WIFI (reserved) compatible
with MT7612E and mainstream 4G modules.
1.4.1. The description of indicator lights
Item
Description
PWR
Power indicator, always on red after powered on.
WORK
Work indicator, 1 sec blink after booting.
WLAN
Wi-Fi indicator, always on green when Wi-Fi is enabled and working properly.
USR
User-defined indicator, can be set via the webpage(socket, VPN...).

User Manual of OpenCPU
www.pusr.com
- 5 -
Your Trustworthy Industrial IoT Partner
NET
Always on after connecting to the network. Two colors indicate 4G network, green indicates 3G
and red indicates 2G.
SIG(1-3)
Signal strength indicator, the more lights on, the stronger the signal.
1.4.2. LED pin definitions
1.4.3. Terminal definitions
Terminal interface
Description
V+，V-
Power interface, built-in anti-reverse protect
GND
Ground terminal
Tx/B
R5232 or RS485, can be set via webpage
Rx/A
R5232 or RS485, can be set via webpage
D11, DI2, D01, D02
DI/DO terminal interface
COM
Do loop terminal

User Manual of OpenCPU
www.pusr.com
- 6 -
Your Trustworthy Industrial IoT Partner
1.4.4. Digital_IO definitions
1.4.5. LTE module pin definitions
1.4.6. UART
Level
3.3V
Band rate
57600
Data bits
8
Parity
None
Stop bit
1
Flow control
None
2. Environment preparation
1>Install aLinux environment, such as the Ubuntu system, switch to the root user, and install software
package dependencies.
apt-get install g++
apt-get install libncurses5-dev
apt-get install zlib1g-dev
apt-get install bison
apt-get install flex
apt-get install unzip
apt-get install autoconf
apt-get install gawk
apt-get install make
apt-get install gettext
apt-get install gcc
apt-get install binutils
apt-get install patch

User Manual of OpenCPU
www.pusr.com
- 7 -
Your Trustworthy Industrial IoT Partner
apt-get install bzip2
apt-get install libz-dev
apt-get install asciidoc
apt-get install subversion
Note: Make sure to confirm that the software packages are installed successfully. After all installations are compl
eted, exit the root user and switch back to aregular user.
2>Create an "openwrt" folder and take out the G809 source code from Git. After downloading the code,
enter the root directory of the source code.
git clone https://github.com/USR-IOT/openwrt.git
3>Execute the following command to update the installation package.
./scripts/feeds update -a
./scripts/feeds install -a
After the updating installation package, the next step is to configure the SDK.
3. SDK Configuration
3.1. Configuration file
3.1.1. Use the configuration file provided by USR
Copy package/USR/configs/USR-G809.config into the root directory of the SDK, and rename it
as .config.
Alternatively, you can load the package package/USR/configs/USR-G809.config by selecting Load in
make menuconfig.
This will automatically load the configurations of USR into make menuconfig.Save and exit.
3.1.2. Custom configurations
Open the graphical configuration interface by running “make menuconfig”.
1>Select the CPU model:
Target System -> MediaTek Ralink MIPS
2>Select the CPU sub-model:
Subtarget -> MT7620 based boards
3>Select the specific router model:
Target profile -> USR USR-G809 32M
4>Select the pre-installed software:
Utilities -> Choose software provided by OpenWrt
Utilities -> USR Applications, choose demo software provided by USR
Save and exit.

User Manual of OpenCPU
www.pusr.com
- 8 -
Your Trustworthy Industrial IoT Partner
4. Firmware compilation
Run make V=s to compile.
Note: After the first successful compilation, you can add "-jxx" after "make" to specify xx threads for simultan
eous compilation, such as "make -j32 V=s".
The compiled bin file is located in the directory: bin/targets/ramips/mt7620/.
The complete firmware file is: openwrt-ramips-mt7620-usr_usr-g809-squashfs-sysupgrade.bin.
total 15M
-rw-r--r-- 1 1000 1000 2.0K Mar 15 13:36 config.buildinfo
-rw-r--r-- 1 1000 1000 288 Mar 15 13:36 feeds.buildinfo
-rw-r--r-- 1 1000 1000 7.0M Mar 15 13:37 openwrt-ramips-mt7620-usr_usr-g809-initramfs-
kernel.bin
-rw-r--r-- 1 1000 1000 4.9K Mar 15 13:37 openwrt-ramips-mt7620-usr_usr-g809.manifest
-rw-r--r-- 1 1000 1000 7.3M Mar 15 13:37 openwrt-ramips-mt7620-usr_usr-g809-squashfs-
sysupgrade.bin
drwxr-xr-x 1 1000 1000 12K Mar 15 13:37 packages
-rw-r--r-- 1 1000 1000 1.4K Mar 15 13:37 profiles.json
-rw-r--r-- 1 1000 1000 686 Mar 15 13:37 sha256sums
-rw-r--r-- 1 1000 1000 20 Mar 15 13:36 version.buildinfo
5. Firmware flashing
5.1. Firmware flashing via uboot
1> Configure the IP address of the computer, either statically or through DHCP. For static IP, use the following
configuration as areference:

User Manual of OpenCPU
www.pusr.com
- 9 -
Your Trustworthy Industrial IoT Partner
2>To use tftpd32 to open the TFTP service and access the firmware directory.
3> Connect the USR-G809 to the computer via an Ethernet cable, either directly or through the same LAN.
4>Use aUSB-TTL serial cable (supporting 3v3) to connect to the debug serial port of the device. Power on
the device and quickly enter the number "2" on the keyboard, then enter "y". Next, modify the device IP to anothe
rIP in the same network segment as the computer, modify the server IP to the IP address of the computer, and
enter the Linux Kernel filename as the name of the firmware. Finally, press enter and wait for the flashing
process to complete.
5>Wait for the system to start up and then access the built-in web page through the LAN port of the G809.
The default username and password are both "root". See the image below for reference: