ED-HMI3120-156C User Manual
by EDA Technology Co., Ltd
built: 2025-09-23
Chapter 1: Hardware Manual
This chapter introduces the product overview, packing list, appearance, buttons, indicator lights, and interfaces.
1.1 Product Overview
The ED-HMI3120-156C is a 15.6-inch industrial tablet computer based on Raspberry Pi CM5. It can be configured with different RAM and eMMC specifications based on application scenarios and user needs.
- RAM options: 2GB, 4GB, 8GB, 16GB.
- eMMC options: 16GB, 32GB, 64GB.
The ED-HMI3120-156C provides common interfaces such as HDMI, USB, Ethernet, RS232, and RS485. It supports network access via Wi-Fi, Ethernet, and 4G. It integrates optional supercapacitor backup power, RTC, Watch Dog, EEPROM, and security chip, enhancing usability and reliability. It is mainly used in industrial control and IoT fields.
1.2 Packing List
- 1 x ED-HMI3120-156C Main Unit
- 1 x Accessory Kit (includes 4x clips, 4x M4*10 screws, and 4x M4*16 screws)
- [Optional Wi-Fi/BT Version] 1x 2.4GHz/5GHz Wi-Fi/BT Antenna
- [Optional 4G Version] 1x 4G/LTE Antenna
1.3 Product Appearance
Describes the functions and definitions of interfaces on each panel.
1.3.1 Front Panel
Describes front panel interface types and definitions.
| Item | Function Description |
|---|---|
| 1 | 1 x LCD Screen, 15.6-inch touchscreen, resolution supports 1920x1080, multi-point capacitive touchscreen. |
1.3.2 Rear Panel
Describes rear panel interface types and definitions.
| Item | Function Description |
|---|---|
| 1 | 4x Clip mounting holes, for embedding the device using clips. |
| 2 | 4 x VESA mounting holes, for VESA bracket installation. |
| 3 | 1 x Speaker, built-in 1x 4Ω 5W speaker, single-channel stereo output. |
1.3.3 Side Panel
Describes side panel interface types and definitions.
| Item | Function Description |
|---|---|
| 1 | 1 x Micro SD Card Slot, for installing Micro SD card, supports user data storage. |
| 2 | 1 x Nano SIM Card Slot, for installing Nano SIM card for 4G signal. |
| 3 | 1 x Micro USB Port, supports eMMC flashing via this port. |
| 4 | 1 x Rubber Plug, reserved hole. |
| 5 | 1 x Wi-Fi/BT Antenna Interface (Optional), SMA connector, for Wi-Fi/BT antenna. |
| 6 | 1 x 4G Antenna Interface (Optional), SMA connector, for 4G antenna. |
| 7 | 1 x HDMI, Type-A connector, compatible with HDMI 2.0, supports 4K 60Hz resolution, for connecting displays. |
| 8 | 2 x USB 2.0, Type-A connectors, each port supports up to 480Mbps transfer speed. |
| 9 | 1x Reset Button, recessed button, press to reset the device. |
| 10 | 1x User Indicator Light, Green, status can be customized by the user. |
| 11 | 1x System Status Indicator Light, Green, indicates system read/write status. |
| 12 | 1x Power Indicator Light, Red, indicates power status. |
| 13 | 1x 4G Signal Indicator Light, Green, indicates 4G signal status. |
| 14 | 4x Serial Port Indicator Lights, Green, indicate serial port communication status. |
| 15 | 1 x DC Input, 2-Pin 3.5mm pitch terminal block, supports 12V~24V input. |
| 16 | 1x Audio Input/Stereo Output, 3.5mm audio jack, can be used for microphone input and stereo output.
|
| 17 | 2 x RS232 Ports, 6-Pin 3.5mm pitch terminal block, for connecting third-party control devices. |
| 18 | 2 x RS485 Ports, 6-Pin 3.5mm pitch terminal block, for connecting third-party control devices. |
Chapter 2: Component Installation (Optional)
This chapter introduces the operation for installing optional components.
2.1 Install Antenna
If the selected ED-HMI3120-156C includes 4G and Wi-Fi functions, antennas must be installed before use.
Prerequisites:
- Antennas are obtained from the packaging. If multiple antennas are included, distinguish them by labels.
Operation Steps:
- Locate the antenna interface on the device side as shown in the diagram.
- Align the device and antenna connectors and screw the antenna clockwise until tight, ensuring it does not detach.
2.2 Install Micro SD Card
If a Micro SD card needs to be installed during product use, follow the steps below.
Prerequisites:
- The Micro SD card to be used is available.
Operation Steps:
- Locate the Micro SD card slot on the device side as shown in the diagram.
- Insert the Micro SD card with the contacts facing down into the slot. A click sound indicates successful installation.
2.3 Install Nano SIM Card
If the selected ED-HMI3120-156C includes 4G functionality, a Nano SIM card must be installed before using the 4G function.
Note: Nano SIM cards do not support hot-plugging.
Prerequisites:
- The 4G Nano SIM card to be used is available.
- Device power is disconnected.
Operation Steps:
- Locate the Nano SIM card slot on the device side as shown in the diagram.
- Insert the Nano SIM card with the contacts facing down into the slot. A click sound indicates successful installation.
Chapter 3: Device Installation
The ED-HMI3120-156C supports flush-mount front installation. The standard package includes an embedded mounting kit (ED-ACCHMI-Front).
Prerequisites:
- Obtain the ED-ACCHMI-Front accessory kit (includes 4x M4*10 screws, 4x M4*16 screws, and 4x clips).
- Prepare a Phillips head screwdriver.
Operation Steps:
- Determine the cutout size for the cabinet based on the dimensions of the ED-HMI3120-156C, as shown in the figure below. Dimensions: 230.5 ±0.5 mm, 380.5 ±0.5 mm, 4-R5.5.
- Drill holes in the cabinet according to the hole size determined in step 1.
- Embed the ED-HMI3120-156C into the cabinet from the outside.
- Align the screw holes of the clips (holes without threads) with the clip mounting holes on the device side and install them.
- Insert 4x M4*10 screws through the clip's screw holes (holes without threads) and tighten clockwise with a screwdriver to secure the clip to the device. Then, insert 4x M4*16 screws through the clip's screw holes (holes with threads) to press against the inside of the cabinet and tighten clockwise until fully seated.
Chapter 4: Powering On the Device
This chapter introduces cable connection and device startup procedures.
4.1 Connecting Cables
Introduces cable connection methods.
Prerequisites:
- Obtain necessary accessories such as a display, mouse, keyboard, and power adapter.
- Obtain network connection.
- Obtain HDMI cable and network cable.
For pin definitions of each interface and connection methods, refer to Section 1.6 Interfaces.
4.2 First Boot
The ED-HMI3120-156C has no power switch. Upon connecting power, the system will start automatically.
- The red PWR LED lights up, indicating the device is powered on.
- The green ACT LED blinks, indicating the system is booting normally. The Raspberry Pi logo will appear in the upper left corner of the screen.
Note: Default username: pi; Default password: raspberry.
4.2.1 Raspberry Pi OS (Desktop)
If the product is shipped with the Desktop version of the OS, it will boot directly to the desktop as shown in the figure.
4.2.2 Raspberry Pi OS (Lite)
If the product is shipped with the Lite version of the OS, it will automatically log in with the default username 'pi' after booting. The default password is 'raspberry'. The figure shows the system has booted normally.
Chapter 5: System Configuration
This chapter introduces system configuration operations.
5.1 Find Device IP
Find Device IP
5.2 Remote Login
Remote Login
5.3 Configure Storage Device
Configure Storage Device
5.4 Configure Ethernet IP
Configure Ethernet IP
5.5 Configure Wi-Fi (Optional)
Configure Wi-Fi
5.6 Configure Bluetooth (Optional)
Configure Bluetooth
5.7 Configure 4G (Optional)
Configure 4G
5.8 Configure Buzzer
Configure Buzzer
5.9 Configure RTC
Configure RTC
5.10 Configure Serial Ports
Introduces configuration methods for RS232 and RS485.
5.10.1 Install picocom Tool
In a Linux environment, the picocom tool can be used to debug RS232 and RS485 serial ports.
Execute the following command to install the picocom tool:
sudo apt-get install picocom5.10.2 Configure RS232
The ED-HMI3120-156C has 2 RS232 ports. Their corresponding COM ports and device files are as follows:
| RS232 Port Count | Corresponding COM Port | Corresponding Device File |
|---|---|---|
| 2 | COM1, COM3 | /dev/com1, /dev/com3 |
Prerequisites:
- The RS232 ports of the ED-HMI3120-156C are connected to external devices.
Operation Steps:
- Execute the following command to open serial port com1 and set the baud rate to 115200:
picocom -b 115200 /dev/com1- Enter commands as needed to control the external device.
5.10.3 Configure RS485
The ED-HMI3120-156C has 2 RS485 ports. Their corresponding COM ports and device files are as follows:
| RS485 Port Count | Corresponding COM Port | Corresponding Device File |
|---|---|---|
| 2 | COM2, COM4 | /dev/com2, /dev/com4 |
Prerequisites:
- The RS485 ports of the ED-HMI3120-156C are connected to external devices.
Operation Steps:
- Execute the following command to open serial port com4 and set the baud rate to 115200:
picocom -b 115200 /dev/com4- Enter commands as needed to control the external device.
5.11 Configure Audio
Configure Audio
5.12 Configure USER Indicator Light
Configure USER Indicator Light
