1 Hardware Manual
This chapter introduces the product overview, package contents, appearance, buttons, indicator lights, and interfaces.
1.1 Product Overview
The ED-HMI2120-070C is a 7-inch industrial panel PC based on Raspberry Pi CM4. It can be configured with different RAM and eMMC specifications to suit various application scenarios and user needs.
- RAM options: 1GB, 2GB, 4GB, and 8GB.
- eMMC options: 8GB, 16GB, and 32GB.
The ED-HMI2120-070C provides common interfaces such as HDMI, USB 2.0, RS232, RS485, Audio, and Ethernet. It also supports network access via Wi-Fi, Ethernet, and 4G. It integrates optional features like supercapacitor backup power, RTC, Watch Dog, EEPROM, and an encryption chip, enhancing usability and reliability. It is primarily used in industrial control and Internet of Things (IoT) applications.
Certifications: CE, FC, ROHS
1.2 Package Contents
- 1 x ED-HMI2120-070C Host Unit
- 1 x Accessory Kit (includes 4x clips, 4x M4*10 screws, and 4x M4*16 screws)
- [Optional Wi-Fi/BT Version] 1 x 2.4GHz/5GHz Wi-Fi/BT Antenna
- [Optional 4G Version] 1 x 4G/LTE Antenna
1.3 Product Appearance
This section describes the functions and definitions of the interfaces on each panel.
1.3.1 Front Panel
This section describes the types and definitions of the front panel interfaces.
Diagram Description: The front panel features a 7-inch LCD screen with a touchscreen (1) and an optional camera (2).
- 1: 1x LCD screen, 7-inch with touchscreen, resolution supporting 1024x600, multi-point capacitive touch screen.
- 2: 1x Camera (optional), 8-megapixel front camera.
1.3.2 Rear Panel
This section describes the types and definitions of the rear panel interfaces.
Diagram Description: The rear panel has four mounting holes (1) for attaching clips.
- 1: 4x mounting holes for clips, used to secure the unit during installation.
1.3.3 Side Panel
This section describes the types and definitions of the side panel interfaces.
Diagram Description: The side panel shows various ports including power, audio, USB, RS232, RS485, Ethernet, and antenna connectors.
- 1: User indicator light (green, user-configurable).
- 2: System status indicator light (green, indicates system read/write status).
- 3: Power indicator light (red, indicates power status).
- 4: 4G signal indicator light (green, indicates 4G signal status).
- 5: Serial port indicator lights (green, indicate serial port communication status).
- 6: DC input (2-Pin 3.5mm terminal block, 9V~36V input).
- 7: Audio input/stereo output (3.5mm audio jack, can be used for microphone input and stereo output. Audio output switches to headphones when plugged in, otherwise to the speaker).
- 8: 2 x RS232 interfaces (6-Pin 3.5mm terminal block for connecting third-party control devices).
- 9: 2 x RS485 interfaces (6-Pin 3.5mm terminal block for connecting third-party control devices).
- 10: 1x 1000M Ethernet interface (RJ45, with LED, 10/100/1000M adaptive, for Ethernet connection).
- 11: 1x 100M Ethernet interface (RJ45, with LED, 10/100M adaptive, for Ethernet connection).
- 12: 1 x HDMI interface (Type-A connector, supports HDMI 2.0, up to 4K@60Hz resolution, for connecting displays).
- 13: 2 x USB 2.0 interfaces (Type-A connectors, each supporting up to 480Mbps transfer speed).
- 14: 1x Reset button (recessed button, press to reset the device).
- 15: 1 x Wi-Fi/BT antenna interface (optional, SMA connector, for Wi-Fi/BT antenna).
- 16: 1x 4G antenna interface (optional, SMA connector, for 4G antenna).
- 17: 1 x Micro USB interface (for eMMC flashing via PC).
- 18: 1 x Nano SIM card slot (for 4G SIM card).
- 19: 1 x Micro SD card slot (for SD card, for storing user data).
1.4 Buttons
The ED-HMI2120-070C has one RESET button, which is a recessed button marked "RESET" on the casing. Pressing the RESET button resets the device.
1.5 Indicator Lights
This section describes the status and meaning of the indicator lights on the ED-HMI2120-070C.
| Indicator | Status | Description |
|---|---|---|
| PWR | Solid On | Device is powered on. |
| Flashing | Device power anomaly; power supply stops immediately. | |
| Off | Device is not powered on. | |
| ACT | Flashing | System boot successful and currently reading/writing data. |
| Off | Device is not powered on or not reading/writing data. | |
| USER | Solid On | User-defined. |
| Off | Device is not powered on or user-defined status is off (default is off). | |
| 4G | Solid On | Dial-up successful, connection normal. |
| Off | 4G signal not connected or device not powered on. | |
| Ethernet Port Yellow Indicator | Solid On | Data transmission abnormal. |
| Flashing | Ethernet data transmission in progress. | |
| Off | Not connected to Ethernet. | |
| Ethernet Port Green Indicator | Solid On | Ethernet connection normal. |
| Flashing | Ethernet connection abnormal. | |
| Off | Not connected to Ethernet. | |
| COM1~COM4 | Solid On/Flashing | Data transmission in progress. |
| Off | Device not powered on or no data transmission. |
1.6 Interfaces
1.6.1 Card Slots
The ED-HMI2120-070C is equipped with one Micro SD card slot and one Nano SIM card slot.
1.6.1.1 Micro SD Card Slot
The Micro SD card slot is marked with "■" and supports Micro SD cards for storing user data.
1.6.1.2 SIM Card Slot (Optional)
The Nano SIM card slot is marked with "■" and is used for installing a SIM card for 4G access. The size difference between Standard SIM, Micro SIM, and Nano SIM cards is illustrated.
Diagram Description: Visual comparison of Standard SIM (15mm), Micro SIM (12mm), and Nano SIM (8.8mm) card dimensions.
1.6.2 Power Input
The ED-HMI2120-070C has one power input, a 2-Pin 3.5mm terminal block marked "VIN+/GND".
| Pin ID | Pin Name |
|---|---|
| 1 | GND |
| 2 | 9V~36V |
1.6.3 Audio Interface
The ED-HMI2120-070C features one audio input and a 3.5mm 4-segment headphone jack, marked with "♪". It supports OMTP standard stereo headphone output and mono microphone input.
- When headphones are plugged in, the audio channel switches to headphone output.
- When headphones are not plugged in, the audio channel switches to speaker output.
1.6.4 Speaker
The ED-HMI2120-070C includes one power amplifier output with a built-in 4Ω 3W speaker, providing mono stereo output. If headphones are connected to the audio interface during audio playback, the speaker will not output sound.
1.6.5 RS232 Interface
The ED-HMI2120-070C has two RS232 interfaces, each with a 6-Pin 3.5mm terminal block. The marking for each RS232 interface is "IGND/TX/RX".
Pin Definition:
| Pin ID | Pin Name |
|---|---|
| 1 | GND |
| 2 | GND |
| 3 | RS232-1_TX |
| 4 | RS232-3_TX |
| 5 | RS232-1_RX |
| 6 | RS232-3_RX |
RS232 Interface to CM4 Pin Mapping:
| 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 |
Wiring Diagram Description: A diagram illustrates the RS232 serial port connection.
1.6.6 RS485 Interface
The ED-HMI2120-070C has two RS485 interfaces, each with a 6-Pin 3.5mm terminal block. The marking for each RS485 interface is "IGND/A/B".
Pin Definition:
| Pin ID | Pin Name |
|---|---|
| 1 | IGND |
| 2 | GND |
| 3 | GND |
| 4 | RS485-2_A |
| 5 | RS485-4_A |
| 6 | RS485-2_B |
| 7 | RS485-4_B |
RS485 Interface to CM4 Pin Mapping:
| 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 |
Wiring Diagram Description: A diagram illustrates the RS485 serial port connection.
RS485 Termination Resistor Configuration: The ED-HMI2120-070C has 120R termination resistors pre-installed between the A and B lines of the RS485 interfaces. Inserting a jumper cap enables this resistor. By default, the jumper cap is not connected, and the 120R termination resistor function is disabled. The location of these resistors on the PCBA is shown in the figures for J24 and J22 (highlighted in red).
Note: To view the location of the 120R termination resistors, the device casing must be opened. Refer to section 2.1.1 "Opening the Device Case" for instructions.
1.6.7 1000M Ethernet Interface
The ED-HMI2120-070C includes one adaptive 10/100/1000M Ethernet interface, marked "1000M". It uses an RJ45 connector. For Ethernet connection, it is recommended to use Cat6 or higher specification network cables.
Pin Definition:
| 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
The ED-HMI2120-070C includes one adaptive 10/100M Ethernet interface, marked "100M". It uses an RJ45 connector. For Ethernet connection, it is recommended to use Cat6 or higher specification network cables.
Pin Definition:
| Pin ID | Pin Name |
|---|---|
| 1 | Tx+ |
| 2 | Tx- |
| 3 | Rx+ |
| 4 | Rx- |
| 5 | Tx+ |
| 6 | Tx- |
| 7 | Rx+ |
| 8 | Rx- |
1.6.9 HDMI Interface
The ED-HMI2120-070C has one HDMI interface, marked "HDMI", which is a standard Type-A connector. It supports connecting to HDMI displays and provides video output up to 4K@60Hz.
1.6.10 USB 2.0 Interface
The ED-HMI2120-070C has two USB 2.0 interfaces, marked with "🔌", which are standard Type-A connectors. They support connecting standard USB 2.0 peripherals and provide transfer speeds up to 480Mbps.
1.6.11 Micro USB Interface
The ED-HMI2120-070C has one Micro USB interface, marked "PROGRAMMING", which supports eMMC flashing via a PC connection.
1.6.12 Antenna InterfaceHere is the JSON requested:
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