Version 1.1

Product Overview

The Cortex®-A72 Raspberry Pi® series EPC-CM4-050 (PN: CS12720RA4050E) is a high-quality industrial Pi PC. It features a 5” five-point capacitive touch screen with a resolution of 1280 x 720 pixels and brightness of 400 cd/m2.

It is available both as an embedded solution and as a device hosed in a casing with bezels, thus facilitating different installation options:

  • Installation on an industrial cabinet

  • Integration with the existing equipment

The EPC-CM4-050 industrial Pi PC is based around the powerful Raspberry Pi® Compute Module 4, powered by the Quad Cortex®-A72 processor with a processor speed of 1.5GHz.


The EPC-CM4-050 (CS12720RA4050E) used to offer an enclosed PC variant (named PPC-CM4-050 V1.0), it doesn’t have HDMI-D port.

We’ve made another PPC-CM4-050 V2.0, it has an HDMI-D port, is smaller, more compact and easier to use, check it at: https://chipsee.com/product/ppc-cm4-050/

Ordering Options

Chipsee products can be customized during the ordering process. The product will be shipped with the pre-installed factory defaults if no extra requirements are specified. The table in the Specifications section provides information about the default options bundled with the product.


You can order EPC-CM4-050 from the official Chipsee Store or from your nearest distributor.

Pi® CM4 Module

The Pi® Compute Module 4 appears in different versions depending on the size of the DDR4 and eMMC.
The EPC-CM4-050 industrial Pi PC does not include the CM4 Raspberry Pi® module by default. If you would like to purchase it with a CM4, you can select it at the Chipsee store during the ordering process.

Operating System

This product comes with a pre-installed Debian OS. Chipsee software engineers have created all the drivers, so every hardware feature is readily available for any standard development tool.

If your project requires a different OS, please Contact us, and we’ll make a customized version that suits your needs.


The EPC-CM4-050 industrial Pi PC offers a broad range of performance and connectivity options for scalable integration, providing expandability according to future needs. Some of the key features are listed in the table below.

Table 275 Key Features



Raspberry Pi® CM4, CM4 Lite; Quad Cortex-A72 at 1.5GHz


1 TF Cards slots3


Based on CM4


Based on CM4


5” IPS LCD, 1280 x 720 resolution px, brightness 400 cd/m2


5-point capacitive touch with 1mm Armored Glass


2 x USB 2.0 Host, 1 x Type-C


1 x Channel Giga LAN


3.5mm Audio Out Connector, 2W Speaker Internal


Onboard Buzzer, driven by GPIO


Yes, High Accuracy RTC with Lithium Button Coin battery (lithium battery not included)


2 x RS232


2 x RS4851




Not Supported


Supported but depending on the CM4 selected2


Not Supported


Not Supported


Support I2C0 I2C1 for CS12720RA4050E


Yes, not mounted by default

Power Input

From 9V to 36V

Current at 12V

500mA Max

Power Consumption

6W Typical

Working Temperature

From 0°C to +60°C




CS12720RA4050E: 141.2 x 77.6 x 25.8mm


CS12720RA4050E: 200g


The RS485 circuit controls the Input and Output direction automatically, there’s no need to control it from within the software.


The default product without the CM4 does not include a Wi-Fi/BT module. You can include a CM4 that has the Wi-Fi/BT module at the Chipsee store during the ordering process.


Chipsee designed TF card slots for storage expansion, as the TF card for storage expansion use same pins with WiFi, it can’t be used with WiFi at same time


Chipsee does not install a lithium battery by default, as we cannot ship products with batteries. We recommend you buy it locally and install it by yourself. The lithium battery part number is CR1220. Please Contact us if you need help.

Power Input

The EPC-CM4-050 industrial Pi PC can be powered by a wide range of input voltages: From 9V to 36V DC. It is a 3 Pin, 3.81mm screw terminal connector.


Figure 922: Power Input

Note that the “+” sign represents the positive power input, and it is printed both at the casing and as a silk-screen on the board of the embedded version. The “-” terminal is shorted to the ground.

Table 276 Power Connector

Power Input Definition

Pin Number



Pin 1

Positive Input

DC Power Positive Terminal

Pin 2

Negative Input

DC Power Negative Terminal

Pin 3


Power System Ground


The system ground “G” is connected to power negative “-” on board.
The central pin is positive.

Touch Screen

The EPC-CM4-050 industrial Pi PC uses a 5-point capacitive touch screen. However, the Debian OS supports only One-Point touch.
The figure below shows the capacitive touch screen connected to the motherboard via the FPC connector.


Capacitive Touch Connector


A capacitive touch screen is susceptible to power noise and Electromagnetic Radiation (EMR). It may cause LCD ripples or even capacitive touch malfunction. If using a capacitive multi-touch test application, you might notice the touch points float erratically across the display. There are several solutions to this problem:

  1. Use a high-quality Power Adapter Unit (PSU) with low EMR. You can also provide power from a battery.

  2. Make sure that the EPC-CM4-050 Power Input connector (pin 3) is properly connected to the Power System Ground to provide sufficient EMI shielding and eliminate the problem entirely.

  3. Bad GND problems can also be confirmed by touching pin 3 of the Power Input connector with one hand while operating the capacitive touch screen with the other hand. In this case, the operator’s body acts as the Power System Ground.


There are many connectivity options available on the EPC-CM4-050 industrial Pi PC. It has 2 x USB 2.0 Host, 1 x Type-C, 1 x Channel Giga LAN (RJ45) Ethernet connector supporting up to 1 Gbps, and 4 x UART terminals (RS232/RS485/CAN).


The serial communication interfaces (RS485, RS232, and CAN) are routed to a 12-pin 3.81mm terminal, as illustrated on the figure below.


Figure 923: RS232, RS485, CAN

The table below offers more detailed description of every pin and its definition:

Table 277 Connectivity Section

RS232 / RS485 / CAN Pin Definition:

Pin Number



Pin 12


CAN H signal

Pin 11


CAN L signal

Pin 10


CPU UART5, RS485 –(B) signal

Pin 9


CPU UART5, RS485 +(A) signal

Pin 8


CPU UART3, RS485 –(B) signal

Pin 7


CPU UART3, RS485 +(A) signal

Pin 6


CPU UART2, RS232 RXD signal

Pin 5


CPU UART2, RS232 TXD signal

Pin 4


CPU UART0, RS232 RXD signal

Pin 3


CPU UART0, RS232 TXD signal

Pin 2


System Ground

Pin 1


System +5V Power Output, No more than 1A Current output


  1. RS485_3 and RS485_5 can control the input and output direction automatically. There’s no need to control it from within the software.

  2. The 120Ω match resistor for the RS485 and CAN bus is NOT mounted by default.

USB Connectors

There are 2 x Type A USB HOST connectors onboard, as shown on the figure below.


USB HOST Connectors


  1. These two USB host connectors can drive 500mA for each channel at most.

  2. When you connect this product to the HOST PC by a USB Type-C cable, the USB HUB will be disabled. As a result, the 2 USB host connectors will not work.

The product has one USB Type-C connector that works as a slave by default. You can use it to establish a connection with the host PC and for downloading the system to the eMMC of CM4 module.


USB-C OTG Connector


Be careful not to touch surrounding electronic components accidentally while plugging in USB devices into the embedded Industrial PC version.

LAN Connectors

LAN (RJ45) connector provides Ethernet connectivity over standardized Ethernet cables as shown in the figure below. The integrated Ethernet interface supports up to 1 Gbps data throughput. These Giga LAN signals come from the CM4 module directly.


RJ45 LAN Connector


Use CAT5 or better cables to achieve full data throughput over maximum distance defined by the 1000BASE-T standard (100m).

WiFi & BT Module

The default EPC-CM4-050 without the CM4 does not include a Wi-Fi/BT module.

If you include a CM4 that has the Wi-Fi/BT module, the product will have Wi-Fi/BT feature.


The product does not come shipped with the Wi-Fi/BT module by default.

Camera Connector

The EPC-CM4-050 industrial Pi PC has a 15 Pin Camera Connector, as shown on the figure below. The camera signals come from CAM1. The table below gives details about the definition of every Pin.


Camera Connector

Table 278 Camera Connector Pin-out

Camera Connector Pin Definition:

Pin Number



Pin 1


Power Ground

Pin 2



Pin 3



Pin 4


Power Ground

Pin 5



Pin 6



Pin 7


Power Ground

Pin 8


CAM1 Clock signal Negative

Pin 9


CAM1 Clock signal Positive

Pin 10


Power Ground

Pin 11


CAM GPIO, use for disable camera power and module

Pin 12


Not connected

Pin 13


CPU I2C SCL0 signal

Pin 14


CPU I2C SDA0 signal

Pin 15


System +3.3V Power Output, No more than 500mA Current output


  1. The camera is not mounted by default.

TF Card Slot

The EPC-CM4-050 industrial Pi PC features 1 x TF Card (micro SD) slot: SD, TF slots can address up to 128GB of memory.


TF (micro SD) Card Slot


  1. The SD is used for memory extension. It can’t be used for system boot-up.

  2. The product does not come shipped with the TF Card by default.

Audio Connector

The EPC-CM4-050 industrial Pi PC features some audio peripherals. It has 1 x 3.5mm audio output jack.
Also, the EPC-CM4-050 industrial Pi PC has a miniature 2W internal speaker for audio reproduction, as well as a small buzzer for alarm/notification sounds.


Figure 924: Audio Connector (embedded/enclosed PC version)


By plugging in the headphone cable, the internal speaker will be disabled automatically.

Boot DIP Switch

The EPC-CM4-050 industrial Pi PC has one button on the board marked as SW1, shown in the figure below.
When button is pressed before power, the Raspberry Pi will boot from the USB connector. You can use this function to download the OS software to the internal eMMC.
When button is released before power, the Raspberry Pi will boot from internal eMMC.

There is no need to press the button during regular operation. However, if you need to reinstall the OS, please refer to the detailed information on how to re-flash the OS from the Software Documentation.


Boot DIP Switch

Mounting Procedure

The EPC-CM4-050 industrial Pi PC can be mounted with 4 x M4 screws, enabling simplified installation onto any standard mounting fixture.


You can mount CS12720RA4050E with the Embedded mounting method, as shown on the figure below.


Figure 925: Embedded mounting


Please make sure the display is not exposed to high pressure when mounting into an enclosure.

You can find detailed information about mounting in the Mount IPC Guide.

Mechanical Specifications


The outer mechanical dimensions of CS12720RA4050E are 141.2 x 77.6 x 25.8mm (W x L x H). Please refer to the technical drawing in the figure below for details related to the specific product measurements.


Figure 926: CS12720RA4050E Technical Drawing

3D Model

As of Mar 23, 2024, the 3D asset of the product is being actively prepared, and will be available soon.

EPC-CM4-050 3D model can be viewed in the online doc in a web browser, if you are reading from the PDF version, please visit the online doc EPC-CM4-050, select hardware documentation, drag the navigation bar to the 3D Model section.


This document is provided strictly for informational purposes. Its contents are subject to change without notice. Chipsee assumes no responsibility for any errors that may occur in this document. Furthermore, Chipsee reserves the right to alter the hardware, software, and/or specifications set forth herein at any time without prior notice and undertakes no obligation to update the information contained in this document.

While every effort has been made to ensure the accuracy of the information contained herein, this document is not guaranteed to be error-free. Further, it does not offer any warranties or conditions, whether expressed orally or implied in law, including implied warranties and conditions of merchantability or fitness for a particular purpose. We specifically disclaim any liability with respect to this document, and no contractual obligations are formed either directly or indirectly by this document.

Despite our best efforts to maintain the accuracy of the information in this document, we assume no responsibility for errors or omissions, nor for damages resulting from the use of the information herein. Please note that Chipsee products are not authorized for use as critical components in life support devices or systems.

Technical Support

If you encounter any difficulties or have questions related to this document, we encourage you to refer to our other documentation for potential solutions. If you cannot find the solution you’re looking for, feel free to contact us. Please email Chipsee Technical Support at support@chipsee.com, providing all relevant information. We value your queries and suggestions and are committed to providing you with the assistance you require.