OpenEmbed EdgeBox-RPI4 Raspberry PI CM4 Based Edge Computer User Manual

EdgeBox-RPI4 Raspberry PI CM4 Based Edge Computer

EdgeBox-RPI4 User Manual  

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EdgeBox-RPI4 User Manual

Revision History

 01-05-2021 Created

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1.0

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01-05-2021

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EdgeBox-RPI4 User Manual

1. Introduction

EdgeBox-RPI4 is a rugged finless Edge Computing Controller with Raspberry Pi Computer Module 4(CM4) for harsh industry environment. It can be used to connect the field networks with cloud or IoT applications. It is designed from the ground up to meet the challenges of rugged applications at competitive prices, ideal for small business or small order with scale multi-level demands.

1.1 Features

• State-of-the-art Aluminum chassis for Harsh environment
• Integrated passive heat sink
• Built-in mini PCIe socket for RF module, such as 4G, WI-FI, Lora or Zigbee
• SMA antenna holes x2
• Built in UPS with supercap for safe shutdown
• Encryption chip ATECC608A
• Hardware Watchdog
• RTC with Super Capacitor
• Isolated DI&DO terminal
• 35mm DIN Rail support
• Wide power supply from 9 to 36V DC

These features make the EdgeBox-RPI4 designed for easy setup and quick deployment for typical industrial applications, such as status monitoring, facility management, digital signage and remote control of public utilities. Furthermore, it is a user-friendly gateway solution with 4 cores ARM Cortex A72 and most industry protocols can save on total deployment costs including electrical power cabling cost and help reduce the product’s deployment time. Its ultra-lightweight and compact design is the answer for applications in space-constricting environments ensures it can operate reliably in a variety of extreme environments including in-vehicle applications.

1.2 Interfaces

Note

|

Func name

|

PIN #

|

PIN #

|

Func name

|

Note

---|---|---|---|---|---

|

POWER

|

1

|

2

|

GND

|

|

RS485_A

| 3|

4

|

RS232_RX

|

|

RS485_B

|

5

|

6

|

RS232_TX

|

|

RS485_GND

|

7

|

8

|

RS232_GND

|

|

DI0-

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9

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10

|

DO0_0

|

|

DI0+

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11

|

12

|

DO0_1

|

|

DI1-

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13

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14

|

DO0_0

|

|

DI1+

|

15

|

16

|

DO0_1

|

NOTE: 24awg to 16awg cable are suggested

2 Ethernet connector
3 USB 2.0 x 2
4 HDMI
5 LED2
6 LED1
7 SMA antenna 1
8 Console(USB type C)
9 SIM card slot
10 SMA antenna 2

1.3 Block Diagram

The processing core of the EdgeBox-RPI4 is a Raspberry CM4 board. A OpenEmbed specific base board implements the specific features. Refer to next figure for the block diagram.

2. Installation

2.1 Mounting

The EdgeBox-RPI4 is intended for two wall mounts, as well one with 35mm DIN- rail . Refer to next figure for the recommended mounting orientation.

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2.2 Connectors and Interfaces

2.2.1 Power supply

Pin#

|

Signal

|

Description

---|---|---

1

|

POWER_IN

|

DC 9-36V

2

|

GND

|

Ground (Reference potential)

 GND Ground (Reference potential)

The PE signal is optional. If there is no EMI present ,the PE connection can left open.

2.2.2 Serial Port (RS232 and RS485)

Pin#

|

Signal

|

Description

---|---|---

4

|

RS232_RX

|

RS232 receive line

6

|

RS232_TX

|

RS232 transmit line

8

|

GND

|

Ground (Reference potential)

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EdgeBox-RPI4 User Manual

The RS485_GND signal is isolated with “GND” signal. If a shielded twisted pair wire is used ,the RS485_GND is connected to the shield.
NOTE: The 120 Ohm termination resistor for RS485 has been installed inside.

Pin#

|

Signal

|

Description

---|---|---

3

|

RS485_A

|

RS485 difference line high

5

|

RS485_B

|

RS485 difference line low

7

|

RS485 _GND

|

RS485 Ground (isolated from GND)

The RS485_GND signal is isolated with “GND” signal. If a shielded twisted pair wire is used ,the RS485_GND is connected to the shield.
NOTE: The 120 Ohm termination resistor for RS485 has been installed inside.

2.2.3 DI&DO

Pin#

|

signal of terminal

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active

|

BCM2711

|

NOTE

---|---|---|---|---

09

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DI0-

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HIGH

|

 GPIO17

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11

|

DI0+

13

|

DI1-

|

HIGH

|

GPIO27

|

15

|

DI1+

10

|

DO0_0

|

HIGH

|

GPIO23

|

12

|

DO0_1

14

|

DO1_0

|

HIGH

|

GPIO24

|

16

|

DO1_1

NOTE:

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EdgeBox-RPI4 User Manual

NOTE:
1. DC voltage for input is 24V(+- 10%).
2. DC voltage for output should be under 60V ,the current capacity is 500ma.
3. Channel 0 and channel 1 of input are isolated to each other
4. Channel 0 and channel 1 of output are isolated to each other

2.2.4 HDMI

Directly connected to the Raspberry PI CM4 board with TVS array.

2.2.5 Ethernet

Ethernet interface is same as Raspberry PI CM4,10/100/1000-BaseT supported, available through the shielded modular jack. Twisted pair cable or shielded twisted pair cable can be used to connect to this port.

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EdgeBox-RPI4 User Manual

2.2.6 USB HOST

There are two USB interfaces at the connector panel. The two ports share the same electronic fuse.

NOTE:  Max current for both ports is limited to 1000ma.

2.2.7 Console(USB type C)

The design of console used a USB-UART converter, most OS of the computer have the driver, if not , the link below may be useful: https://www.silabs.com/products/interface/usb-bridges/classic-usb- bridges/device.cp2104 This port is used as a Linux console default. You can log into the OS use the settings of 115200,8n1(Bits: 8,Parity: None, Stop Bits: 1, Flow Control: None).A terminal program such as putty is needed, too. The default user name is pi and password is raspberry.

2.2.8 LED

EdgeBox-RPI4 use two green/red dual colour LED as outside indicators.

LED1: green as power indicator and red as eMMC active.

LED2: green as 4G indicator and red as user programmable led connected to GPIO21,lowactive,programmable.

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EdgeBox-RPI4 User Manual

EdgeBox-RPI4 also use two green colour LED for debug.

2.2.9 SMA Connector

There are two SMA Connector holes for antennas. The antenna types are very depend on what modules fitted into the Mini-PCIe socket. The ANT1 is default used for Mini-PCIe socket and ANT2 is for Internal WI-FI signal from CM4 module. 1. The functions of the antennas are not fixed, maybe adjusted to cover other usage.2.2.10 NANO SIM card slot

The sim card is only needed in cellular(4G,LTE or others based on cellular technology ) mode.

NOTES:

1. The functions of the antennas are not fixed, maybe adjusted to cover other usage.

2.2.10 NANO SIM card slot

The sim card is only needed in cellular(4G,LTE or others based on cellular technology ) mode.

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EdgeBox-RPI4 User Manual

NOTES:

1. Only NANO Sim card is accepted, pay attention to the card size.
2. The NANO sim card is inserted with chip side top. 

2.2.11 Mini-PCIe

The orange area is the rough Mini-PCIe add-on card position, only one m2x5 screw is needed.

The table below show all the signals. Full size Mini-PCIe card are supported.

Signal

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PIN#

|

PIN#

|

PIN# Signal

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1

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5

|

4G_PWR

|

3

|

4

|

GND

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5

|

6

|

USIM_PWR

|

7

|

8

|

USIM_PWR

GND

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9

|

10

| USIM_DATA

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11

|

12

| USIM_CLK

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13

|

14

| USIM_RESET#

GND

|

15

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16

|

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EdgeBox-RPI4 User Manual

 18 GND  20 21 22 PERST#  24 4G_PWR  26 GND  27 28 29 30 UART_PCIE_TX  32 UART_PCIE_RX  34 GND  35 36 USB_DM

|

17

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 18

|

GND

---|---|---|---

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19

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20

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GND

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21

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22

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PERST#

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23

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24

|

4G_PWR

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25

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26

|

GND

GND

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27

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28

|

GND

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29

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30

|

UART_PCIE_TX

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31

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32

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UART_PCIE_RX

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33

|

34

|

GND

GND

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35

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36

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USB_DM

GND

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37

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38

|

USB_DP

4G_PWR

|

39

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40

|

GND

4G_PWR

|

41

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42

|

4G_LED

GND

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43

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44

|

USIM_DET

SPI1_SCK

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45

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46

|

SPI1_MISO

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47

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48

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SPI1_MOSI

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49

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50

|

GND

SPI1_SS

|

51

|

52

|

4G_PWR

N OTE 3: 4G_LED signal is connected to LED2 internally, refer to section of 2.2.8.

N OTE 4: SPI1 signals are used only for Lora WAN card, such as SX1301,SX1302 from the third company.

2.2.12 M.2

EdgeBox-RPI4 equipped a M.2 socket of M KEY type .ONLY 2242 size NVME SSD card is support, NOT msata.

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EdgeBox-RPI4 User Manual

3. Drivers and Programming Interfaces

3.1 LED

The is a LED used as user indicator, refer to 2.2.8 .

Use LED2 as a example to test the function.

$ sudo -i #enable root account privileges

$ cd /sys/class/gpio

$ echo 21 > export #GPIO21 which is user LED of LED2 $ cd gpio21

$ echo out > direction

$ echo 0 > value # turn on the user LED, LOW active $ echo 1 > value # turn off the user LED

3.2 Serial Port (RS232 and RS485)

There are two individual serial ports in the system. The /dev/ttyUSB1 as RS232 port and/dev/ttyUSB0 as RS485 port. Use RS232 as a example. $ python

import serial

ser=serial.Serial(‘/dev/ttyUSB1’,115200,timeout=1) >>> ser.isOpen()

ser.isOpen()

ser.write(‘1234567890’)

3.3 Cellular over Mini-PCIe

Use Quectel EC20 as a example and follow the steps :

1. Insert the EC20 into Mini-PCIe socket and micro sim card in related slot, connect the antenna.

2. Log in the system via console use pi/raspberry.

3. Turn on the power of Mini-PCIe socket and release the reset signal. $ sudo -i #enable root account privileges

$ cd /sys/class/gpio

$ echo 6 > export #GPIO6 which is POW_ON signal

$ echo 5 > export #GPIO5 which is reset signal

$ cd gpio6

$ echo out > direction

$ echo 1 > value # turn on the power of Mini PCIe true

$ cd gpio5

$ echo out > direction

$ echo 1 > value # release the reset signal of Mini PCIe

NOTE: Then the LED of 4G is start to flash.

4. Check the device:

$ lsusb

$ Bus 001 Device 005: ID 2c7c:0125 Quectel Wireless Solutions Co., Ltd. EC25 LTE modem

…… $ dmesg

AND

$

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EdgeBox-RPI4 User Manual

[ 185.421911] usb 1-1.3: new high-speed USB device number 5 using dwco tg

[ 185.561937] usb 1-1.3: New USB device found, idVendor=2c7c, idProduct=0125, bcdDevice= 3.18[ 185.561953] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0[ 185.561963] usb 1-1.3: Product: Android

[ 185.561972] usb 1-1.3: Manufacturer: Android

[ 185.651402] usbcore: registered new interface driver cdc_wdm

[ 185.665545] usbcore: registered new interface driver option [ 185.665593] usbserial: USB Serial support registered for GSM modem (1-port) [ 185.665973] option 1-1.3:1.0: GSM modem (1-port) converter detected [ 185.666283] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2

[ 185.666499] option 1-1.3:1.1: GSM modem (1-port) converter detected [ 185.666701] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3

[ 185.666880] option 1-1.3:1.2: GSM modem (1-port) converter detected [ 185.667048] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB4

[ 185.667220] option 1-1.3:1.3: GSM modem (1-port) converter detected [ 185.667384] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB5

[ 185.667810] qmi_wwan 1-1.3:1.4: cdc-wdm0: USB WDM device [ 185.669160]qmi_wwan 1-1.3:1.4 wwan0: register ‘qmi_wwan’ at usb- 3f980000.usb-1.3, WWAN/QMI

……

xx:xx:xx:xx:xx:xx is the MAC address.

$ ifconfig -a

……wwan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 169.254.69.13 netmask 255.255.0.0 broadcast 169.254.255.255inet6 fe80::8bc:5a1a:204a:1a4b prefixlen 64 scopeid 0x20ether 0a:e6:41:60:cf:42 txqueuelen 1000 (Ethernet)

RX packets 0 bytes 0 (0.0 B)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 165 bytes 11660 (11.3 KiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 5. How to use AT command

$ miniterm — Available ports:

— 1: /dev/ttyAMA0 ‘ttyAMA0’

— 2: /dev/ttyUSB0 ‘CP2105 Dual USB to UART Bridge Controller’ — 3: /dev/ttyUSB1 ‘CP2105 Dual USB to UART Bridge Controller’ — 4: /dev/ttyUSB2 ‘Android’

— 5: /dev/ttyUSB3 ‘Android’

— 6: /dev/ttyUSB4 ‘Android’

device,xx:xx:xx:xx:xx:xx

— 7: /dev/ttyUSB5 ‘Android’

— Enter port index or full name:

$ mini term /dev/ttyUSB5 115200

Some useful AT command :

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• AT //should return OK
• AT+QINISTAT //return the initialization status of (U)SIM card, the response should be 7
• AT+QCCID //returns the ICCID (Integrated Circuit Card Identifier) number of the (U)SIM card

6. How to dial

$su root

$ cd /usr/app/linux-ppp-scripts

Then the 4G led is flashing.

If success, the return like this:

7. Add the router path

$ route add default gw 10.64.64.64 or your gateway XX.XX.XX.XX Then have a test

$ ping google.com

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3.4 WDT

3.4.1 Block Diagram of WDT

The WDT module have three terminals, input ,output and LED indicator.

WDI(GPIO25) WDO(System RST#)

Note: The LED is optional and not available in earlier hardware version.

3.4.2 How it works

1. System POWER ON.

2. Delay 200ms.

3. Send WDO a negative pulse with 200ms low level to reset the system.

4. Pull up WDO.

5. Delay 120 seconds while the indicator flashing(typical 1hz).

3 V 3

6. Turn off the indicator.

7. Wait for 8 pulses at WDI to active WDT module and light the LED.

8. Get Into WDT-FEED mode , at least one pulse should be feed into WDI in at least every 2 seconds, if not, the WDT module should output a negative pulse to reset the system.

9. Goto 2.

LED GREEN WDT

3.5 RTC

The chip of RTC is MCP79410 from microchip. It is mounted on the system I2C bus. R16 22R R0402

R17 22R R0402

3.5.1

GPIO2 GPIO3

I2C_SDA I2C_SCL

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EdgeBox-RPI4 User Manual

The OS itself has the driver inside, only we need are some configurations. Open /etc/rc.local AND add 2 lines:

echo “mcp7941x 0x6f” > /sys/class/i2c-adapter/i2c-1/new_device hwclock -s

Then reset the system and the RTC is working.

1.make sure the i2c-1 driver point is open, and the point is closed default. 2. the estimated backup time of the RTC is 15 days.

3.10 UPS for safe shut down The UPS module diagram is listed below.

3.5.2

Note：

The UPS module is inserted between the DC5V and CM4,a GPIO is used to alarm CPU when the 5Vpower supply is down. Then the CPU should do something urgent in a script before energy exhaustion of super capacitor and run a “ $shutdown” Another way to use this function is Initiate a shutdown when GPIO pin changes. The given GPIO pin is configured as an input key that generates KEY_POWER events. This event is handled by system logind by initiating a shutdown. System d versions older than 225 need an udev rule enable listening to the input

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Use /boot/overlays/README as reference, then modify /boot/config.txt. dtoverlay=gpio-shutdown, gpio_pin=GPIO22,active_low=1

NOTE:The alarm signal is active LOW.

device:

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4. Electrical specifications

4.1 Power consumption

The power consumption of the EdgeBox-RPI4 strongly depends on the application, the mode of operation and the peripheral devices connected. The given values have to be seen as approximate values. The following table shows power consumption parameters of the EdgeBox-RPI4: Note: On condition of power supply 24V, no add-on card in sockets and no USB devices. Mode of operation 81Stress test 172 stress -c 4 -t 10m -v &

stress -c 4 -t 10m -v &

| | |

4.2 UPS

The backup time of UPS module is very depend on the system load of the system. Some typical conditions are listed below. The test module of CM4 is 4GB LPDDR4,32GB eMMC with Wi-FI module. Mode of operation 55Full load of CPU 18 stress -c 4 -t 10m -v &5. Mechanical Drawings

stress -c 4 -t 10m -v &

| | |

5. Mechanical Drawings

TBD

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References

• OpenEmbed-Embedded.IoT.Edge
• CP2104 Classic USB to UART Bridge - Silicon Labs

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