General information

Download technical specification

Model selection

Different Gateway models are available depending on the periphery availability and type.

Model	Cellular Network				GNSS	Internal memory
AG-702	GPRS	3G	LTR 4G	5G		Flash 64MB	NAND 512MB
AG-702-V48						√	√
AG-702-LT-IN-V48	√		√		√	√	√
AG-702-LT-EU-V48	√		√		√	√	√
G-702-LT-GL-V48	√	√	√		√	√	√

Hardware informations

The Gateway is made on one PCB, which is fitted to the aluminum housing. The housing is made of a thick, strong aluminum profile with two end plates also made from aluminum. The surface of the housing is finished by anodizing.

At the bottom of the housing there are slots through which DIN rail clamp or any other clamp can be mounted by t-nuts.

Top view dimens

Side view dimensions

Connectors

Top view connectors and indicators

Block diagram

For a better understanding of the operation of the gateway, refer to the block diagram. Non-essential components have been omitted. Developers who program peripherals such as GPIOs, serial etc. will find information about them in the sections dedicated to such peripherals.

Power supply

The Gateway power supply range is 8-48V DC (version V48). You need to connect the gate according to the inscriptions at the main connector. The Gateway is protected against reverse power connection. If the polarity is reversed, the Gateway will not start.

PoE

The Gateway can also be powered via PoE in the range of input power supply using unused pairs of wires in the LAN cable. Below is the pinout of the RJ45 socket.

Pin number	Function	Comment
1	RX+	Data
2	RX-	Data
3	TX+	Data
4	DC+	Power supply positive
5	DC+	Power supply positive
6	TX-	Data
7	DC-	Power supply negative
8	DC-	Power supply negative

LTE 4G modem

Generally, the Gateway supports all versions of Quectel MiniPCI express modems. However, you can use a third-party modem, as long as the signal outputs are compatible with those of the Quectel company. For use your LTE module, select model without LTE module installed. You also need to pay attention to the power supply to the LTE module should be 3.3V.

Mobile network signal strength is also displayed on 4 LED indicators.

MiniPCI express pinout

Below is the description of the PCI express pinout used in the AG-702. Before installing anything other than the EC200U or EG25, be sure to check the pinout for compatibility. The LTE model is connected via a USB data bus.

GNSS

Device has wboded LTE modem along with GNSS function. In order to receive the GNSS signal, an antenna is required. There are two types of GNSS antennas: active gnss antenna and passive gnss antenna. The AG-702 supports both types of antennas, but in order for the active antenna to work properly, it is necessary to start powering the active antenna. To do this, you need to go to System > Custom Commands and select the command Turn GPS antenna to active mode.

Also on this page, you can test whether the GNSS is working properly. To do so, you need to click Activate GPS on ttyUSB7 and then Show GPS location.

Ethernet

The gateway has two RJ45 ethernet ports with LED indicators. The speed of each is 100Mbps. By default, Ethernet-1 is configured as a WAN port and Ethernet-2 is configured as a LAN port. Ethernet-1 supports PoE on free RJ45 pairs.

The default IP of ethernet:
Eth-1: DHCP
Eth-2: 192.168.1.1

WiFi

The gateway has WiFi 2.4Ghz. By default, the WiFi is set as a hotspot and shares internet from Ethernet and from LTE via WiFi.

Serial Interface

The Gateway has two serial ports. One RS232 and one RS485. Both ports are optically isolated from the main computer circuit, but are not isolated from each other. In addition to insulation, they are also protected against surges.

RS232

The RS232 port includes CTS and RTS signals in addition to TX and RX signals. The baudrate range for the RS232 port is 300bps to 230400bps . The port is protected by high-power TVS diodes against electrical surges.

RS485

The baudrate range for RS485 port is 600 bps to 460800 bps. Note that with a longer cable, the maximum speed may drop. It is recommended to use special cables designed for RS485. The port is protected by high-power TVS diodes against electrical surges.

Digital I/O

The Gateway has two digital inputs and one digital output.

Digital inputs

The digital inputs are completely independent optically isolated inputs that accept an input signal level of up to 30V DC. They have no common minus. They can be connected either with a common plus or minus. Can be controlled with open collector. They require to be powered. The range of the signal considered as a logical 1 is from 3.5V to the maximum input voltage.

Digital output

The digital output is realized on a relay whose load capacity is 3A. The maximum voltage is 160V AC and 30DC. The output is only in normal open format (NO).

LED indicators

The AG-702 gateway has fourteen indicators on the front panel. By default, they are programmed to perform certain functions, but they are all controlled by the processor and knowing the OpenWRT system well, change their functions.