1 Hardware Manual

This chapter introduces the product overview, packing list, appearance, button, indicator and interface.

1.1 Overview

ED-HMI2120-070C is a 7-inch high reliability industrial HMI based on Raspberry Pi CM4. According to different application scenarios and user needs, different specifications of RAM and eMMC computer systems can be selected.

Options for 1GB, 2GB, 4GB and 8GB RAM
Options for 8GB, 16GB and 32GB eMMC storage

ED-HMI2120-070C provides common interfaces such as HDMI, USB 2.0, RS232, RS485, audio and Ethernet, and supports access to the network through Wi-Fi, Ethernet and 4G. ED-HMI2120-070C integrates supercapacitor (backup power supply, which is optional), RTC, Watch Dog, EEPROM and encryption chip, improving the ease of use and reliability of the product. It is mainly used in industrial control and IOT.

1.2 Packing List

1x ED-HMI2120-070C Unit
1 x Mounting Kit (including 4 x buckles, 4xM410 screws and 4xM416 screws)
[optional Wi-Fi/BT version] 1x 2.4GHz/5GHz Wi-Fi/BT Antenna
[optional 4G version] 1x 4G/LTE Antenna

1.3 Appearance

Introducing the functions and definitions of interfaces on each panel.

1.3.1 Front Panel

Introducing the front panel interface types and definitions.

NO.	Function Definition
1	1 x LCD display, 7-inch LCD touch screen, which supports up to 1024x600 resolution and multi-point capacitive touchscreen.
2	1 x camera (optional), 8 Megapixel front camera.

1.3.2 Rear Panel

Introducing the types and definitions of the rear panel interface.

NO.	Function Definition
1	4 x installation holes of buckle, which are used to fix the buckles to the device for installation.

1.3.3 Side Panel

Introducing the types and definitions of side panel interfaces.

NO.	Function Definition
1	1 x green user indicator, user can customize a status according to actual application.
2	1 x green system status indicator, which is used to check the working status of device.
3	1 x red power indicator, which is used to check the status of device power-on and power-off.
4	1 x green 4G indicator, which is used to check the status of 4G signal.
5	4 x green UART indicators, using to check the communication status of UART port.
6	1 x DC input, 2-Pin 3.5mm pitch phoenix terminals with screw holes. It supports 9V~36V input, the signal is defined as VIN+/GND.
7	1 x Audio input/Stereo output, 3.5mm audio jack connector. It can be used as MIC IN and LINE OUT. When a headphone is connected, the audio output is switched to the headphone. When a headphone is not connected, the audio output is switched to the speaker.
8	2 x RS232 ports, 6-Pin 3.5mm pitch phoenix terminals, which is used to connect third-party control equipment.
9	2 x RS485 ports, 6-Pin 3.5mm pitch phoenix terminal, which is used to connect the third-party control equipment.
10	1 x 10/100/1000M adaptive ethernet port, RJ45 connector, with led indicator.It can be used to access the network.
11	1 x 10/100M adaptive ethernet port, RJ45 connector, with led indicator. It can be used to access the network.
12	1 x HDMI port, type A connector, which is compatible with HDMI 2.1 standard and supports 4K 60Hz. It supports to connect a displayer.
13	2 x USB 2.0 ports, type A connector, each channel supports up to 480Mbps transmission rate.
14	1 x Reset button, pressing the button will reset the device.
15	1 x Wi-Fi/BT antenna port, SMA connector, which can connect to Wi-Fi/BT antenna.
16	1 x 4G antenna port, SMA connector, which can connect to 4G antenna.
17	1 x Micro USB port, which supports to flash to eMMC for the system.
18	1 x Nano SIM slot, which is used to install a SIM card for getting 4G signal.
19	1 x Micro-SD card slot, which is used to install SD card for storing user data.

1.4 Button

ED-HMI2120-070C includes a RESET button, which is a hidden button, and the silkscreen on the case is "RESET". Pressing the RESET button will reset the device.

1.5 Indicator

Introducing the various statuses and meanings of indicators contained in ED-HMI2120-070C.

Indicator	Status	Description
PWR	On	The device has been powered on.
	Blink	Power supply of the device is abnormal, please stop the power supply immediately.
	Off	The device is not powered on.
ACT	Blink	The system started successfully and is reading and writing data.
ACT	Off	The device is not powered on or does not read and write data.
USER	On	User can customize a status according to actual application.
USER	Off	The device is not powered on or not defined by the user, and the default status is off.
4G	On	The dial-up is successful and the connection is normal.
4G	Off	4G signal is not connected or the device is not powered on.
Yellow indicatorof Ethernet port	On	The data transmission is abnormal.
	Blink	Data is being transmitted over the Ethernet port.
	Off	The Ethernet connection is not set up.
Green indicatorof Ethernet port	On	The Ethernet connection is in the normal state.
	Blink	The Ethernet connection is abnormal.
	Off	The Ethernet connection is not set up.
COM1~COM4	On/Blink	Data is being transmitted.
COM1~COM4	Off	The device is not powered on or there is no data transmission.

1.6 Interface

Introducing the definition and function of each interface in the product.

1.6.1 Card Slot

ED-HMI2120-070C includes an SD card slot and a Nano SIM card slot.

1.6.1.1 SD Card Slot

The silkscreen on the case of Micro SD card slot is "", which is used to install SD card for storing user data.

1.6.1.2 SIM Card Slot

The silkscreen on the case of Nano SIM card slot is "", which is used to install SIM card for obtaining 4G signals.

1.6.2 Power Supply Interface

The ED-HMI2120-070C includes one power input, 2-Pin 3.5mm pitch phoenix terminals with screw holes. The silkscreen of port is "VIN+/GND", and the pins are defined as follows.

	Pin ID	Pin Name
	1	GND
	2	9V~36V

1.6.3 Audio Interface

ED-HMI2120-070C includes one audio input, the connector is a 3.5mm 4-pole headphone jack. The silkscreen of port is "", which supports OMTP stereo headphone output and mono microphone recording.

When the headphone is connected, the audio output is switched to the headphone.
When the headphone is not connected, the audio output is switched to the speaker.

1.6.4 Speaker

The ED-HMI2120-070C contains a power amplifier output, built-in a 4Ω 3W speaker, supporting single-channel stereo output. When playing audio, if the headphone is connected to the Audio interface, the speaker will have no audio output.

1.6.5 RS232 Interface

ED-HMI2120-070C include 2 RS232 ports, 6-Pin 3.5mm pitch phoenix terminals. The silkscreen of single RS232 is “IGND/TX/RX”.

Pin Definition

Terminal pins are defined as follows:

	Pin ID	Pin Name
	1	GND
	2	GND
	3	RS232-1_TX
	4	RS232-3_TX
	5	RS232-1_RX
	6	RS232-3_RX

The pin names of CM4 corresponding to RS232 interface are as follows:

Signal	CM4 GPIO Name	CM4 Pin Out
RS232-1_TX	GPIO4	UART3_TXD
RS232-3_TX	GPIO0	UART2_TXD
RS232-1_RX	GPIO5	UART3_RXD
RS232-3_RX	GPIO1	UART2_RXD

Connecting Cables

Schematic diagram of RS232 wires is as follows:

1.6.6 RS485

ED-HMI2120-070C include 2 RS485 ports, 6-Pin 3.5mm pitch phoenix terminals. The silkscreen of single RS485 is “IGND/A/B”.

Pin Definition

Terminal pins are defined as follows:

	Pin ID	Pin Name
	1	GND
	2	GND
	3	RS485-2_A
	4	RS485-4_A
	5	RS485-2_B
	6	RS485-4_B

The pin names of CM4 corresponding to RS485 interface are as follows:

Signal	CM4 GPIO Name	CM4 Pin Out
RS485-2_A	GPIO12	UART5_TXD
RS485-4_A	GPIO8	UART4_TXD
RS485-2_B	GPIO13	UART5_RXD
RS485-4_B	GPIO9	UART4_RXD

Connecting Cables

Schematic diagram of RS485 wires is as follows:

RS485 terminal resistance configuration

ED-HMI2120-070C contain 2 RS485 ports. A 120R jumper resistor is reserved between A and B of RS485 line. The jumper cap can be inserted to enable the jumper resistor. By default, the jumper cap is not connected, and the 120R jumper resistor function is disabled. The position of jumper resistor in the PCBA are J24 and J22 in the figure below (red box position).

The relationship between the RS485 ports and corresponding COM ports are shown in the table below.

Location in PCBA	Corresponding COM port	The specific location of the corresponding COM
J24	COM4
J22	COM2

TIP

You need to open the device case to view the position of 120R jumper resistor. For detailed operations, please refer to 2.1.1 Open Device Case.

1.6.7 1000M Ethernet Interface

ED-HMI2120-070C includes one adaptive 10/100/1000M Ethernet port, and the silkscreen is "". The connector is RJ45, which can support PoE with the expansion module. When accessing to network, it is recommended to use the network cable of Cat6 and above. The pins corresponding to the terminal are defined as follows:

	Pin ID	Pin Name
	1	TX1+
	2	TX1-
	3	TX2+
	4	TX2-
	5	TX3+
	6	TX3-
	7	TX4+
	8	TX4-

1.6.8 100M Ethernet Interface

ED-HMI2120-070C includes includes an adaptive 10/100M Ethernet port, and the silkscreen is "". The connector is RJ45, and it is recommended to use the network cable with Cat6 and above when accessing to network. The pins corresponding to the terminal are defined as follows:

	Pin ID	Pin Name
	1	TX+
	2	TX-
	3	Rx+
	4	-
	5	-
	6	RX-
	7	-
	8	-

1.6.9 HDMI Interface

ED-HMI2120-070C includes one HDMI port, the silkscreen is "HDMI". The connector is type A HDMI, which can connect to an HDMI display and supports up to 4Kp60.

1.6.10 USB 2.0 Interface

ED-HMI2120-070C includes 2 USB2.0 ports, the silkscreen is "". The connector is type A USB, which can connect to standard USB 2.0 peripherals and supports up to 480Mbps transmission rate.

1.6.11 Micro USB Interface

ED-HMI2120-070C includes one Micro USB interface, the silkscreen is "PROGRAMMING" and it can be connected to a PC to flash to eMMC of the device.

1.6.12 Antenna Interface (optional)

The ED-HMI2120-070C includes 2 SMA antenna ports, the silkscreens are "4G" and "Wi-Fi/BT" and they can be connected to the 4G antenna and Wi-Fi/BT antenna.

TIP

The number of antenna interface is related to the purchasing product model. Here, we take two antenna interfaces as an example.

1.6.13 Motherboard Interface

Introducing the interfaces reserved in the ED-HMI2120-070C, which can be obtained only after the device case is opened and can be expanded according to actual needs.

NO.	Function
1	12V 1A Power Output
2	10-Pin GPIO Pin Header
3	40-Pin GPIO Pin Header
4	M.2 B
5	RTC Battery Base
6	USB 2.0 Pin Header
7	CSI Interface
8	FPC HDMI Interface

1.6.13.1 12V 1A Output

The motherboard of ED-HMI2120-070C includes 3 expanded 12V 1A power output ports with 2-Pin 2.0mm white WTB connector, which is reserved for the extended LCD screen to supply power. The pins are defined as follows:

	Pin ID	Pin Name
	1	GND
	2	12V

1.6.13.2 10-Pin GPIO

The motherboard of ED-HMI2120-070C includes a 10-Pin GPIO Pin Header with 2x5-Pin 2.54mm pitch, which is used to lead out the extended GPIO port. The user can customize the extension, and the pins definition are as follows:

	Pin ID	Pin Name
	1	EXIO_P10
	2	3V3
	3	EXIO_P12
	4	EXIO_P11
	5	EXIO_P14
	6	EXIO_P13
	7	EXIO_P16
	8	EXIO_P15
	9	GND
	10	EXIO_P17

1.6.13.3 40-Pin GPIO

The motherboard of ED-HMI2120-070C includes a 40-Pin GPIO terminal with 2x20-Pin 2.54mm pitch, which is used to lead out the GPIO port of CM4, and reserves to connect the extended accessories. The pins are defined as follows:

	Pin ID	Pin Name	Pin ID	Pin Name
	1	3V3_EXT	2	5V2_CM4
	3	GPIO2	4	5V2_CM4
	5	GPIO3	6	GND
	7	GPIO4	8	GPIO14
	9	GND	10	GPIO15
	11	GPIO17	12	GPIO18
	13	GPIO27	14	GND
	15	GPIO22	16	GPIO23
	17	3V3_EXT	18	GPIO24
	19	GPIO10	20	GND
	21	GPIO9	22	GPIO25
	23	GPIO11	24	GPIO8
	25	GND	26	GPIO7
	27	GPIO0	28	GPIO1
	29	GPIO5	30	GND
	31	GPIO6	32	GPIO12
	33	GPIO13	34	GND
	35	GPIO19	36	GPIO16
	37	GPIO26	38	GPIO20
	39	GND	40	GPIO21
Note:GPIO4~GPIO9、GPIO12、GPIO13 and GPIO22~GPIO27 has been used for other specific functions. If you need to use the function of its ordinary IO, you need to remove the jumper resistance on the corresponding signal line.

1.6.13.4 M.2 B Interface

The motherboard of ED-HMI2120-070C includes a M.2 B Key connector, which is used for external SSD. It is compatible with M.2 B 2230 and M.2 B 2242 SSD.

1.6.13.5 RTC Battery Base

The motherboard of ED-HMI2120-070C is integrated with RTC. For the version sold in China, we will install CR1220 battery (RTC backup power supply) by default.

RTC can ensure that the system has an uninterrupted and reliable clock, which is not affected by factors such as the device is power down.

TIP

Some international logistics do not support the transportation of batteries, and some ex-factory devices are not equipped with CR1220 batteries. Therefore, before using RTC, please prepare a CR1220 battery and install it on the motherboard.

1.6.13.6 USB 2.0 Interface

The motherboard of ED-HMI2120-070C includes an extended USB 2.0 Pin Header with 5-Pin 1.5mm pitch WTB connector. It is used to expand a USB 2.0 interface, the pins are defined as follows:

	Pin ID	Pin Name
	1	VBUS
	2	USB_DM
	3	USB_DP
	4	GND
	5	GND

1.6.13.7 CSI Interface

The motherboard of ED-HMI2120-070C includes one extended CSI interface, 2x15-Pin 0.4mm pitch connector and 2-Lane CSI signal. It is used to expand the connection of 8-megapixels CSI camera, the pins are defined as follows:

Pin ID	Pin Name	Pin ID	Pin Name
1	NC	2	NC
3	1V8_CM4	4	1V2_CSI
5	1V8_CM4	6	GND
7	CSI_MCLK	8	GND
9	GND	10	2V8_CSI
11	NC	12	NC
13	NC	14	NC
15	GND	16	GND
17	NC	18	NC
19	GND	20	CSI_D1_N
21	CSI_D1_P	22	GND
23	CSI_D0_N	24	CSI_D0_P
25	GND	26	CSI_CLK_N
27	CSI_CLK_P	28	GND
29	SCL_1V8	30	SDA_1V8

1.6.13.8 FPC HDMI Interface

The motherboard of ED-HMI2120-070C includes one extended HDMI interface with 40-pin 0.5mm pitch FPC connector. It supports video signal output to LCD screen, reserves to connect the extended LCD screen. It supports USB/I2C touch screen and backlight adjustment. The pins are defined as follows:

Pin ID	Pin Name	Pin ID	Pin Name
1	NC	2	NC
3	NC	4	NC
5	NC	6	NC
7	NC	8	GND
9	HDMI1_CLKN	10	HDMI1_CLKP
11	GND	12	GND
13	HDMI1_TX0N	14	HDMI1_TX0P
15	GND	16	GND
17	HDMI1_TX1N	18	HDMI1_TX1P
19	GND	20	GND
21	HDMI1_TX2N	22	HDMI1_TX2P
23	GND	24	GND
25	HDMI1_CEC	26	GND
27	HDMI1_SCL	28	HDMI1_SDA
29	GND	30	HDMI1_HPD
31	GND	32	TPINT_L
33	GND	34	SDA_LCD
35	SCL_LCD	36	GND
37	GND	38	USB_DP_LCD
39	USB_DM_LCD	40	GND