1. 4G

IHC-3308GW has single wifi version and wifi+4g version, please confirm that the machine used is equipped with 4G module.

Resolution method: Check the number of antennas, if there is only one antenna interface, it is the single wifi version. If there are two antenna interfaces, it is the wifi+4g version.

The 4G module used is EC200S-CN, for Buildroot or Ubuntu system, after power on, the system will automatically dial

1.1. SIM card connection

_images/sim_connect.png

1.2. 4G antenna connection

_images/4g_antenna.png

1.3. Manual AT command dial-up networking

If the system cannot dial normally, you can use AT commands to troubleshoot the problem manually.

  • Confirm whether the EC200S-CN module starts normally, and the usb0 network card corresponds to the EC200S-CN module

#ifconfig usb0
usb0 Link encap:Ethernet HWaddr AE:0C:29:A3:9B:6D
          inet addr:192.168.43.100 Bcast:192.168.43.255 Mask:255.255.255.0
          inet6 addr: fe80::ed5d:84b6:c27c:3825/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:39 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes: 3456 (3.3 KiB) TX bytes: 3811 (3.7 KiB)

  • Configure serial port properties

    If it is an Ubuntu system, it needs to be configured

    # stty -F /dev/ttyUSB2 icrnl opost onlcr icanon echo echoe

  • Query module status

    # cat /dev/ttyUSB2 &
# echo AT+QCFG="usbnet" > /dev/ttyUSB2

    If it returns +QCFG: "usbnet",1, that is ECM status

  • Module is configured to ECM NIC status

    echo AT+QCFG="usbnet",1 > /dev/ttyUSB2

  • Dial

    echo AT+QNETDEVCTL=1,1,1 > /dev/ttyUSB2

  • ping external network

    _images/ping_usb0.png

  • Other AT commands

disconnect dial

echo AT+QNETDEVCTL=0,1,1 > /dev/ttyUSB2

Check the strength of the antenna signal, return the value “0-31,99”, try to ensure that the signal strength is “26-31,99”

echo "AT+CSQ" > /dev/ttyUSB2

Check whether the sim card or IoT card is inserted, and return to READY normally

echo "AT+CPIN?" > /dev/ttyUSB2

Check the operator, such as China Unicom CHN-UNICOM, mobile “CHINA MOBILE”

echo "AT+COPS?" > /dev/ttyUSB2

Check whether the traffic service of the sim card is normal

echo "AT+CGATT?" > /dev/ttyUSB2

Return +CGATT: 1 means attached, +CGATT: 0 means detached, when returning +CGATT: 0, please check whether the traffic service of the card is normal

2. Uart

The expansion board expands multiple serial ports for use, including 3 RS485 and 1 RS232.

The kernel already supports the above serial port functions by default. The device files corresponding to each serial port are as follows:

RS485_1: /dev/ttysWK0
RS485_2: /dev/ttysWK1
RS485_3: /dev/ttysWK2
RS232 : /dev/ttysWK3

Take RS485_1 as an example:

  • connect

Connect the A and B pins of RS485_1 to the A and B pins of the host serial adapter (USB to 485 to serial port module) respectively.

  • Open the serial terminal of the host

Open kermit in the terminal and set the baud rate:

$ sudo kermit
C-Kermit> set line /dev/ttysWK0
C-Kermit> set speed 9600
C-Kermit> set flow-control none
C-Kermit > connect

/dev/ttyUSB0 is the device file of the USB-to-serial adapter recognized by the host.

  • send data

Run the following command on the device:

echo "Firefly RS485 test..." > /dev/ttysWK0

The serial terminal in the host can receive the string “Firefly RS485 test…”.

  • Receive data

First run the following command on the device:

cat /dev/ttysWK0

Then enter the string “Firefly RS485 test…” in the serial terminal of the host, and the same string can be seen on the device side.

3. CAN

  • connect

Just connect the CANH, CANL of the device and the CANH, CAHL of the communication terminal correspondingly.

  • send data

ip link set can0 down
ip link set can0 type can bitrate 250000
ip link set can0 up
cansend can0 123#1122334455667788

  • Receive data

ip link set can0 down
ip link set can0 type can bitrate 250000
ip link set can0 up
candump can0

  • loopback mode test

ip link set can0 down
ip link set can0 type can bitrate 50000 loopback on
ip link set can0 up
candump can0 &
cansend can0 123#11223344556677

4. DIN

The gateway supports one optocoupler isolation interface, where DI corresponds to INPUT1 in the hardware schematic diagram, and COM corresponds to INPUT_COM in the hardware schematic diagram.

  • Circuit Schematic

_images/gpio_input.png

  • Detection

When INPUT1, INPUT_COM are on, GPIO_INPUT1 will detect a low level; when INPUT1, INPUT_COM are off, GPIO_INPUT1 will detect a high level.

The corresponding GPIO ports are as follows:

GPIO_INPUT1: GPIO1_A6, 38

The detection method is as follows:

# apply for GPIO
echo 38 > /sys/class/gpio/export
# set as input
echo in > /sys/class/gpio/gpio38/direction
# read level value
cat /sys/class/gpio/gpio38/value

5. DOUT

The gateway supports one relay interface, DO corresponds to OUTPUT1 in the hardware schematic diagram, and COM corresponds to RELAY_COM1 in the hardware schematic diagram.

  • Circuit schematic

_images/relay_ctl.png

  • control

When RELAY_CTL1 outputs a low level, OUTPUT1, RELAY_COM1 are disconnected; when RELAY_CTL1 outputs a high level, OUTPUT1, RELAY_COM1 are turned on.

The corresponding GPIO ports are as follows:

RELAY_CTL1: GPIO1_B2, 42

The control method is as follows:

# apply for GPIO
echo 42 > /sys/class/gpio/export
# set as output
echo out > /sys/class/gpio/gpio42/direction
# Set the level value, 1 / 0
echo 1 > /sys/class/gpio/gpio42/value

6. LED

The gateway supports 6 customizable LED lights, and the corresponding GPIO ports are as follows:

L1 GPIO2_A7 (gpio71)
L2 GPIO2_A6 (gpio70)
L3 GPIO2_B3 (gpio74)
L4 GPIO2_B2 (gpio73)
L5 GPIO2_B5 (gpio76)
L6 GPIO2_B4 (gpio75)

The control method is as follows, taking L1 as an example:

# Bright
echo 1 > /sys/class/leds/firefly\:green\:L1/brightness
# off
echo 0 > /sys/class/leds/firefly\:green\:L1/brightness