The ACR-LGW device is already configured according to user requirements from the manufacturing process. Do not make configuration changes, if you are not absolutely sure, what these changes affect. It is recommended to contact the supplier or manufacturer and consult the intended issue.
The ACR-LGW can be user configured via two channels. One way of configuration is via SSH communication protocol using commands sent through the terminal application. The other way how to configure the device is via the GUI using LuCi web interface its package is installed in OpenWRT operating system.
Before attempting any of the following operations, assure the ETHERNET connection and turn on the power supply for the ACR-LGW device.
Screenshots displayed in the following sections correspond to recommended, default settings, if not specified otherwise.
For both configuration options, the user connects to the device via the ETHERNET interface, and the IP address is required.
The IP address of the particular device can be found on the box label. IP address looks for example like this number code “192.168.20.148”.
If the IP address is unknown, follow next steps:
ls -d tty*
screen /dev/ttyUSB0 115200
The IP address of the wired ETHERNET connection can be found in the list on the screen. Look for the “eth0” entry.
The device running on the OpenWRT always listens for SSH commands on the port 22. To connect via the SSH, type the command
Where xxx.xxx.xxx.xxx is the discovered ACR-LGW IP address, example “192.168.20.148”.
To control and configure the ACR-LGW device via SSH connection, visit OpenWRT web page and follow their User Guide.
To close the SSH session, use the command
The OpenWRT operating system is running on single board computer and is responsible for controlling entire ACR-LGW unit. OpenWRT is installed on flash memory and contains modifications prepared for ACR-LGW hardware.
Newest and stable version is always installed on the new device and all necessary settings are done during the manufacturing process to fulfill customer requirements.
If necessary, the procedure for the OpenWRT operating system installation can be found here. Whole procedure is not simple and requires advanced skills. Correct source code for particular hardware needs to be selected and built. Please contact the supplier/manufacturer to discuss the operating system installation.
The procedure describing update of operating system from LuCi web interface can be found in documentation here.
The correct source file containing operating system is required for installation. Procedure is not simple and requires some skills. Please contact the manufacturer/supplier to discuss the update options.
Another method for operating system update uses SSH via ETHERNET connection and transfers source image to ACR-LGW device. Update is run directly from ACR-LGW device.
Contact the supplier/manufacturer to obtain the correct and fresh source image with the operating system.
To perform operating system update from USB memory device, continue with following instructions:
scp omega2.bin root@IPaddress:/root
scp omega2.bin email@example.com:/root
screen /dev/ttyUSB0 115200
By using command
ls verify that transferred system image omega2.bin is located in folder ( root/ folder may contain image file only, but more other files can also be presented).
New version of operating system can be also installed using USB flash drive. This method is especially useful, when ACR-LGW device update is not possible using previous methods.
To perform OS update, follow these steps:
The LuCi web interface allows you to easily manage and configure ACR-LGW device settings.
If LuCi web interface package is not installed, install it using this guide.
To connect to the ACR-LGW device through LuCi web interface, type device’s IP address to web browser. Login page is displayed. Type Username and Password delivered together with the ACR-LGW unit. If login credentials are unknown, contact the supplier or manufacturer.
After the successful login, the Status of the system is displayed.
Main menu is located at the top of LuCi web page and gives user access to system diagnostics and individual system settings.
Following sections describes the most important menu entries and explains settings and options. Menu entries that aren't mentioned here are described here.
This menu allows you to configure LoRa wireless connectivity.
From the Region combo box, the LoRa region can be selected. EU, US and CN options are available. Depending on selected region, the ACR-LGW device is automatically configured to work with a frequency plan predefined for particular region. Basic overview of channel assignment is summarized in following table. CN option is not available with current hardware setup.
|LuCi designation||LoRaWAN standard||Frequency range||Center frequency||Available bands|
|EU||EU863-870||863 – 870 MHz||868 MHz||8|
|US||US902-928||902 – 928 MHz||915 MHz||10|
Network server settings section serves for network configuration of the gateway.
IP address describes the address to which all nodes connect. - THIS IS CRUCIAL - by default it's set to 127.0.0.1 or ns.acrios.com
Uplink and Downlink port can be the same, because half-duplex form of communication is used.
Gateway ID field allows you to distinguish your gateway from others and create LoRaWAN network. If only one gateway is connected to the network, Gateway ID parameter is not important.
To save all changes click on Submit… button and restart the ACR-LGW device (go to System menu and select the Reboot item). Login is required after reboot.
All LoRaWAN related settings are stored in /etc/lora/global_conf.json and can be also modified manually using serial interface or SSH if needed.
The ACR-LGW PCB is assembled with almost all components from the bottom side. Top side contains interfaces and connectors to make installation and connections easier and without need to completely remove PCB from the box.
The PCB layout is universal, some connectors might not be assembled, depending on your hardware configuration.
Next figure represents full functionality of the ACR-LGW. Not assembled connectors and components are used for debugging purposes or will serve for future functionalities.
All antennas are connected via MCX connectors. To disconnect antenna, gently pull the connector until it releases. To connect antenna, gently push the connector towards the PCB until it clicks.
The power supply is connected via screw terminals. Properly tight screws in terminals to avoid transition resistance and possible supply cuts.
In order to connect the ACR-LGW to internet via LTE, please follow these instructions:
For service operations, settings and control, two console service connectors can be used. Default rate is 115200 Bauds.
The UART serial interface uses RX and TX signals only. Voltage levels are referenced to 3.3 V DC. The second console interface is converted from UART to USB and guided out to miniUSB connector.
In case of MLGW, use USB to UART TTL cable to connect to serial interface.
1. Unplug LTE antenna by hand and remove two screws with screwdriver, which are holding the LTE module
2. Take out the module and turn it upside down. There you can see a SIM card slot.
3. Insert the SIM card into the slot and mount the module back. First screw in the screws and then plug the antenna back.
1. Setup custom APN in LuCI interface
2. In file /etc/chatscripts/3g.chat, edit line with AT+CGDCONT (for example with
3. Reboot, wait several minutes, you can check APN with:
comgt -d /dev/ttyACM2 info &
4. Try to reboot again, if the module does not change its APN on the first time.
5. Now you should have custom APN, you can check you have IP from a private IP pool using: ifconfig 3g-lte
User can utilize four digital general purpose input/output ports directly connected to the core module. Also the 3.3 V DC voltage is accessible through pin header SV2, that is assembled based on user requirements.
These general purpose input/output ports can be utilized to sense or control another hardware unit assembled together with the ACR-LGW device inside metallic box.
All interfaces are equipped with ESD protection devices. Used components secure sufficient level of isolation between an external power supply and internal electronics.