seeed studio reTerminal DM User manual

reTerminal DM
User Manual
10.1'' Integrated Device Master

Document History
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
Version Date Description of Change
1.0 10-May-23 Initial release

Table of Contents
C1. Introduction
1.1 Overview
1.2 Feature
1.3 Specification
1.4 Dimension
C2. Hardware Overview
2.1 System Overview
2.1.1 Interface Overview
2.1.2 Mainboard Overview
2.1.3 Power Supply
2.1.4 Block Diagram
2.1.5 IIC Tree
2.2 Interface Description
2.2.1 Microphone
2.2.2 LED Indicator
2.2.3 Light Sensor
2.2.4 Buzzer
2.2.5 Multi-functional Terminals
2.2.6 DI/DO
2.2.7 RS485
2.2.8 RS232
2.2.9 CAN
2.2.10 Boot Switch
2.2.11 USB
2.2.12 SIM Slot
2.2.13 Reset Hole
2.2.14 Audio Jack
2.2.15 HDMI
2.2.16 Ethernet RJ45
2.2.17 40-Pin GPIO
2.2.18 RTC
2.2.19 Watchdog
2.3 Optional Interfaces and Modules
2.3.1 WiFi/BLE
2.3.2 4G Module
2.3.3 LoRa®Module
2.3.4 Camera
2.3.5 PCIe Expansion Card
2.3.6 PoE
2.3.7 SSD
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reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.

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reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
C3. Assembly Guide
3.1 Disassembly Guide
3.2 Assemble WiFi/BLE Antenna
3.3 Assemble 4G Module and Antenna
3.4 Assemble LoRa® Module and Antenna
3.5 Assemble PCIe Extension Module
3.6 Assemble SSD
3.7 Assemble Camera
3.8 Assemble PoE Module
3.9 RTC Battery Replacement
3.10 Fuse Replacement
3.11 Chassis Grounding Guide
3.12 Terminal Connection Guide
C4. Mounting Guide
4.1 Panel Mount
4.2 VESA Mount
4.3 DIN Rail Mount
C5. Warranty & Support
5.1 Warranty
5.2 Support

C1. Introduction
1.1 Overview
1.2 Feature
The reTerminal DM is a multi-functional industrial panel PC based on the Raspberry Pi CM4 platform. With its powerful computing
performance, convenient touchscreen interface, various IOT gateway wireless connectivity options, rich peripheral interfaces, and
strict industrial reliability design, the reTerminal DM is ideal for a wide range of applications and industries, including energy mana-
gement, medical monitoring, commercial retail, home automation, and more.
In addition, the reTerminal DM offers flexible expandability and customization options. It can be easily and cost-effectively customiz-
ed to meet the specific needs of different user scenarios.
Powerful performance
Powered by Raspberry Pi CM4
Broadcom BCM2711 quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
Up to 8GB RAM and 32GB eMMC
Multi-OS support
Raspbian OS
SenseCraft Edge Platform with seeedstudio device management
Perfect interaction
10.1 inch 1280*800 HMI
10-point capacitive touch control
400nit IPS display with 170/170° view angle
Rich wireless capabilities
On-chip WiFi
On-chip BLE
Mini-PCIe for LoRaWAN® (optional)
Mini-PCIe for 4G LTE (optional)
Rich interface
1 x 1000M ethernet RJ45 port
2 x USB2.0 Type A + 1 x USB2.0 Type C
1x RS485
1 x RS232
1 x CAN FD
4 x DO + 4 x DI
40-pin GPIO
Rugged design for harsh environment
IP65 front panel
Die-cast aluminum alloy housing
-10~50°C operating temperature
10~95% RH operating humidity
Electrically isolated IOs and interface
Meets strict EMC testing standards
Others
High accuracy RTC
1~255 hardware Watchdog
ATECC608A security chip
12~24V DC power supply
PoE (optional)
Panel, VESA, Din-Rail mount
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
1

1.3 Specification
Parameter Description
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
CM4
Quad-core Cortex-A72@ 1.5GHz
8GB RAM
32GB eMMC
M.2 NVMe SSD Slot 2280-M Key(optional)
Raspbian
SenseCraft Edge Platform
10.1''
1280 x 800
16.7M (8-bit)
400
170/170
30000
10-point Capacitive
7H
HDMI2.0
Microphone x 2
Buzzer
3.5mm Audio Jack
CSI(optional)
1 x 10/100/1000 Mbps
2 x 10/100/1000 Mbps(optional)
2 x USB-A 2.0 Host
2 x USB 3.0 (optional)
1 x RS-485 >Terminal Block
1 xRS-485 > DB9(optional)
1 x RS-232 >Terminal Block
1 xRS-232 > DB9(optional)
1 x CAN-BUS >Terminal BlockT
4x DI >Terminal Block
4x DO >Terminal Block
inside
On-chip Wifi
On-chip BLE
Mini-PCIe for LoraWAN(optional)
Mini-PCIe for 4G(optional)
Basic
CPU
Memory
Storage
OS Support
Display
Size
Max. Resolution
Max. Colors
Luminance (nit)
Viewing Angle (H/V°)
Backlight Life (hrs)
Touch Type
Pencil Hardness
Video&Audio
Video
Audio
Camera
Interfaces
Ethernet
USB
RS485
RS232
CAN
DI
DO
40pin GPIO
Wireless Communication
Wifi
BLE
LoRa
Cellular
2

Parameter Description
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
Power
Input
PoE
Power Range
Power Consumption
Power Switch
Reboot Switch
Environment
Ingress Protection
Operating Temperature
Storage Temperature
Humidity (Operating)
Mechanical
Dimension (W x H x D)
Enclosure
Mounting
Weight (Net)
Certification
EMC
ESD
EFT
Surge
Others
RTC
Watchdog
Security
Warranty
Heat dissipation
2-pin Terminal Block
PoE(optional)
12~24V DC
4W Idle.
9W Max.
NO
YES
IP65 Front Panel
-10~50 °C
-20~70 °C
10~95% RH
259.4x191x42.2mm
Die-cast aluminum alloy
Panel, VESA,Din-Rail
1.8Kg
CE,FCC,UKCA
RoHS
Telec
REACH
EN61000-4-2,Level3
EN61000-4-4,Level2
EN61000-4-5, Level 2
High Accuracy RTC
1~255s
ATECC608A
2 years
Fanless
3

1.4 Dimension
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
Unit: mm
4

2.1 System Overview
C2. Hardware Overview
2.1.1 Interface Overview
7
6
89
10
11 12 13 15
14
16
17
18
12345
Microphone
1
LED Indicator
2
Light Sensor
3
Buzzer
4
Microphone
5
RS485/232/DIO/CAN
7
Power In
6
Boot Switch
8
USB Device
9
SIM Slot
10
Reset Hole
11
USB Host
12
Audio Out
13
4 Reserved Antennas
Ports for Wireless
18
1000M Ethernet
15
PCIe Extension Slot
16
SSD Solt
17
HDMI
14
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
5

2.1.2 Mainboard Overview
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
Watchdog enable [J20]
[J1]
USB2.0 9Pin
DSI1 [J18]
Mini-PCIe LoRa®[J19]
Light connector [J16]
MIC connector [J15]
Mini-PCIe 4G/LTE [J17]
TP connector [J13]
Fuse & Socket [J14]
RTC connector[J12]
Power connector [J5]
LED connector [J6]
PCIe [J7]
40-PIN header [J8]
PoE [J9]
MIC connector [J10]
[J2]
CSI0
[J3]
CSI1
[J4]
Camera
RTC battery [J11]
Lable Description Default Status
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15
J16
J17
J18
J19
J20
9-pin USB2.0 Reserved
15-pin 2 lane CSI0 FPC connector Reserved
22-pin 4 lane CSI1 FPC connector Reserved
Camera Optional
Power connector Reserved
Front panel LED PCBA connector Occupied
PCIe slot Reserved
40-pin header Reserved
PoE module welding hole Reserved
Microphone PCBA connector Occupied
RTC battery Included
RTC 2-pin connector Occupied
Touch panel connector Occupied
Fuse socket, fuse included Occupied
Microphone PCBA connector Occupied
Light sensor connector Occupied
Mini-PCIe slot for 4G/LTE module Optional
DSI1 connector for mipi display Occupied
Mini-PCIe slot for LoRa module Optional
Watchdog hardware enable Occupied
®
6

5V
5V
3.3V
5V
5V
2.1.3 Power Supply
Power Diagram
CM4
200PIN
USB TYPEA x2
HDMI
40 PIN(ext)
RS485
CANIsolated Power
DCDC
BOOST
MINI-PCIe(ext)
10.1’
LCD Display
TLV320AIC3104
RS232
Mini-PCIe
(LoRa®)
Mini-PCIe(LTE)
USB 2.0 HUB
RTC IC
TF CARD
LED and Buzzer
ECC608A
GPIO EXPAN
MINI-PCIe(ext)
EEPROM
3V3 DCDC
VDD_3V3_SYS
Max:1.1A
5V
5V
5V
5V
5V
5V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
The reTerminal DM supports two power supply options: DC terminal and PoE port. By default, the reTerminal DM is powered
through the DC terminal, while the PoE power supply is optional. This provides flexibility in power supply selection and allows for
easy integration with various power sources.
PoE 12V
Surge and OVP
Terminal 2Pin
(12-24V)
5V DCDC
VDD_5V_SYS
7

Power Consumption
Please refer to the table below for the tested power consumption of reTerminal DM in Seeed Studio's laboratory. Please note that this
value is for reference only, as the test methods and environment can result in variations in the results.
Status Voltage Current Power Consumption Description
Shutdown
Idle
Full Load
0.6mA Static power consumption test in shutdown and power-off state.
24V 0.165A 3.96W
To test the input current when supplying 24V power to the reTerminal DM
device through the Terminal socket while running the default Seeed Studio
system, without running any test programs.
24V 0.37A 8.88W
Configure CPU to run at full load using the "stress -c 4" command, while
playing a video and performing CAN & RS485 communication. No external
devices connected.
2-pin power terminal
The reTerminal DM is supplied with a nominal voltage of 12~24 V. The power supply is connected via the 2-pin power terminal block
connector. To ground the reTerminal DM, the ground wire can be secured to the screw located at the top left corner of the power
terminal.
For instructions on how to ground the chassis, please refer to section 3.11 - Chassis Grounding Guide.
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
PoE
With the PoE module installed, the LAN1 port of reTerminal DM can support PoE power supply, providing a convenient and efficient
way to power the device over Ethernet. This option simplifies the installation process and reduces the amount of cabling required,
making it an ideal solution for applications with limited power sources or where power outlets are not readily available.
Note
PoE input: Range 44~57V; Tipical 48V
PoE output: 12V, 1.1A Max.
It's worth noting that the PoE module provided with the reTerminal DM is compliant with the IEEE 802.3af standard and can provide a maximum power supply of
13W. Therefore, if there is a need to connect high-power peripherals such as mobile hard disks or 4G modules, the PoE power supply may not be sufficient. In this
case, it's recommended to use the DC terminal for power supply instead to ensure stable and reliable operation of the device.
Power On and Power Off
Note
Please note that after shutting down, please wait for at least 10 seconds before restarting the system to allow for the internal capacitors to fully discharge.
The reTerminal DM does not come with a power button by default, and the system will automatically start up once power is connect-
ed. When shutting down, please select the shutdown option in the operating system and wait for the system to fully shut down
before cutting off power. To restart the system, simply reconnect the power
8

2.1.4 Block Diagram
LED x2
PWR,ACT
LED x1 USER
RTC Timer
and Watchdog
CR2032
MIC x2
CONN
3.5mm
Headphone
CONN
Encryption
ECC608
Codec
TLV320AIC3104
EEPROM x2
FPC
Connector
Terminal
Connect
HDMI
Light Sensor
10.1’’ MIPI
Display
GPIO Expan
1 to 16
Optocoupler
Isolation
Buzzer
eMMC
32GB
DEVICE
RF Antenna
BASEBOARD
CIRCUIT
INTERF ACE
CONN
CM4
DEVICE
LPDDR4
4/8GB
Wi-Fi
Bluetooth
Wi-Fi
Bluetooth nRPIBOOT
USB 2.0
SPIO
IIC
IIC
IIC
IIC
IIC
IIC
PCIe x1
SPI
UART0
GPIO x4
GPIO x4
GPIO
GBe
HDMI0
IIC
IIC
DSI
CM4
Connecter
Socket
200Pin
PCM
Toggle Switch
2CH
USB Switch
SGM7222YW
USB HUB2
x4
LTE_USB
Mini PCIE_USB
PIN Header
PIN Header
USB4
USB1/USB2
LET_USB
SPI0
IIC
USB3
RS485 x1
RS232 x1
CAN x1
SET=1
SET=0
Expandable
Mini PCIE_USB
4Lanes
GPIO
DI x4
DO x4
HDMI0
SET
SET=0 USB HUB1
x4
Optocoupler
Isolation
USB TypeA
x2
Mini-PCIe
LTE
Mini-PCIe x1
LoRa®
USIM Card
WM1302
LTE
Antenna
RF
Antenna
USB to
UARTS
UART to RS485
Isolated
UART to
RS232 Terminal
Connect
SPI to CAN
Isolated
USB Switch
SGM7222YW
URAT to USB USB TypeC
OTG/Debug
PCIe
to Gbe
PCIe Switch
1 to 3
RJ45 Gbe
x2
RJ45 Gbe x1
40PIN
SSD M
Key
Mini-PCIe
4 lane CSI
2 lane CSI
Map Legend:
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
9

2.1.5 IIC Tree
PCF8563T
40PIN
Mini-PCIe
EEPROM x2
Light Sensor
CM4
TLV320AIC3104
GPIO EXPAN
Mini-PCIe
LoRa®
40 PIN
CSI
MIPI IPS
0x51
ATECC608A 0xc0
0x57
User operable
0x50
0x29
0x1b
0x21
0x5d
IIC3
IIC1
IIC0
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
10

Note
It's important to note that in order to achieve an IP65 rating for the front panel, the microphone openings are covered with a waterproof acoustic membrane.
Please avoid using sharp objects to touch the microphone openings.
2.2.2 LED Indicator
2.2 Interface Description
The reTerminal DM features three LED indicators that serve to signal the machine's operational status. Please refer to the table
below for the specific functions and states of each LED:
if the ACT LED blinks in a regular four blink pattern, it cannot find bootcode (start.elf)
if the ACT LED blinks in an irregular pattern then booting has started.
If the ACT LED doesn't blink, then the EEPROM code might be corrupted, try again without anything connected to make sure.
For more detail please check the Raspberry Pi forum:
STICKY: Is your Pi not booting? (The Boot Problems Sticky) - Raspberry Pi Forums
For more detail please check the Raspberry Pi forum: https://forums.raspberrypi.com//viewtopic.php?f=28&t=58151
LED pin assignment
ACT Status table
Lable Signal Signal Source Color Description
PWR
USER
ACT
LED_nPWR
LED_nACT
CM4 Yellow Used to indicate the power supply of CM4. When the CM4 is powered
on normally, the LED will light up
PCA9535 - GPIO
expansion
Red User defined function
CM4 Green Used to indicate various states of the system. See the table below.
2.2.1 Microphone
The reTerminal DM is equipped with two MEMS microphones located on the left and right sides below the screen. These micro-
phones can be configured as a dual microphone array, providing superior sound pickup capabilities.
The microphones communicate with the audio codec chip through the IIS interface, while the codec chip communicates with CM4
through the PCM interface. The audio codec chip selected for the reTerminal DM is the TI TLV320AIC3104 Low-Power Stereo Audio
Codec.
x2
POWER USER ACT
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
Long flashes Short flashes Status
0 3 Generic failure to boot
0 4 start*.elf not found
0 7 Kernel image not found
0 8 SDRAM failure
0 9 Insufficient SDRAM
0 10 In HALT state
2 1 Partition not FAT
2 2 Failed to read from partition
2 3 Extended partition not FAT
2 4 File signature/hash mismatch - Pi 4
4 4 Unsupported board type
4 5 Fatal firmware error
4 6 Power failure type A
4 7 Power failure type B
11

2.2.3 Light Sensor
The light sensor, located at the bottom right of the screen, is capable of detecting ambient light intensity and automatically
adjusting screen brightness to provide an optimal viewing experience while conserving energy.
The light sensor communicates with the CM4 through IIC protocol. Additionally, the light sensor's IIC address and other relevant
information can be found in the "2.1.4 IIC Tree" section.
2.2.4 Buzzer
The reTerminal DM features an active buzzer located at the bottom right corner of the screen, which can be used for various
purposes such as alarm and event notifications. The buzzer is controlled through the PCA9535 GPIO expansion IC, which provides
additional digital I/O channels for the device.
2.2.5 Multi-functional Terminals
Terminal and signal comparison table
Terminal pin assignment table
CANH CANL GND_ISO RS485A RS485B GND_ISO RS232_TX RS232_RX GND GND
DI1 DI2 DI3 DI4 GND_DI DO1 DO2 DO3 DO4 GND_DO
Pin Silk-screen Signal Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
CH CANH Differential CAN signal high
CL CANL Differential CAN signal low
GS GND_ISO Isolated ground signal
RA RS485A Differential RS485 signal A
RB RS485B Differential RS485 signal B
GS GND_ISO Isolated ground signal
RT RS232_TX
RS232 signal receive endRX RS232_RX
RS232 signal transmit end
GD GND Mainboard ground
GD GND Mainboard ground
I1 DI1 Digital input 1
I2 DI2 Digital input 2
I3 DI3 Digital input 3
I4 DI4 Digital input 4
GI GND_DI Input ground signal, connected with GND via 1M
D1 DO1 Digital output 1
D2 DO2 Digital output 2
D3 DO3 Digital output 3
D4 DO4 Digital output 4
GO GND_DO Output ground signal,connected with GND via 0
Ω
Ω
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
12

Note
The RS485 interface uses an isolated power supply, which means that the ground signal for external devices connected to the RS485 interface should be connected
to the GND_ISO pin.
2.2.7 RS485
The reTerminal DM is equipped with an RS485 interface through its 20-pin connector, which is isolated for both signal and power to
ensure safe and reliable operation in industrial and automation applications. The RS485A and RS485B signals are isolated using
capacitive isolation, which provides excellent EMI immunity and meets the high-speed communication requirements of the RS485
interface.
A terminal resistor of 120Ω has been installed by default.
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
2.2.6 DI/DO
The reTerminal DM supports 4 digital input and 4 digital output channels, all of which are optically isolated to effectively protect the
mainboard from voltage spikes or other electrical disturbances.
The negative logic used for the digital inputs and outputs of reTerminal DM, the logic level relationship between Terminal IO and
CM4 GPIO is shown in the table below.
The ground for the input signals is different from the ground for the output signals. The ground for the input signals should be connected to the GND_DI pin, while
the ground for the output signals should be connected to the GND_DO pin.
Note
DI/DO pin assignment table
Digital Input Digital Output
Terminal Dightal Input CM4 GPIO Detect Signal
Low High
High Low
CM4 GPIO Output Terminal Digital Output
High Low
Low High
PinCM4 Signal Typical Voltage Range Max. Voltage Rated Current Capacity
DI1
DI2
DI3
DI4
GND_DI
DO1
DO2
DO3
DO4
GND_DO
GPIO16 5-24V DC 30V DC
GPIO17 5-24V DC 30V DC
GPIO22 5-24V DC 30V DC
GPIO23 5-24V DC 30V DC
GPIO24 5-24V DC 30V DC 500mA
GPIO25 5-24V DC 30V DC 500mA
GPIO26 5-24V DC 30V DC 500mA
GPIO6 5-24V DC 30V DC 500mA
13

Note
The CAN interface uses an isolated power supply, which means that the ground signal for external devices connected to the RS485 interface should be connected
to the GND_ISO pin.
2.2.10 Boot Switch
The Boot Switch of reTerminal DM is connected to the nRPI_BOOT pin of CM4. This switch allows users to select either eMMC or
USB as the boot source. In normal operation, the boot switch should be set to the right position, and the system will boot from
eMMC. If users need to flash the system image, they should set the boot switch to the left position, and the system can boot from
Type-C USB.
Switch Position ModeDescription nRPI_BOOT
Normal Mode Boot from eMMC Low
Flash Mode Boot from USB High
2.2.11 USB
The reTerminal DM is equipped with one USB Type-C port and two USB Type-A ports. Please refer to the table below for their
functions and descriptions.
Type Quantity Protocol Function Description
Type-C
Type-A
*1 USB2.0 USB-Device Used for serial port debugging, burning image, etc.
*2 USB2.0 USB-HOST Connect different USB devices such as flash drive, USB keyboard or mouse
2.2.8 RS232
The reTerminal DM's 20-pin connector also includes an RS232 interface, which is not isolated. Because RS232 communication
typically uses CMOS voltage levels and has short communication distances, making it less susceptible to electromagnetic interfer-
ence from the environment.
2.2.9 CAN
The reTerminal DM features a CAN interface that supports the CAN FD (Controller Area Network Flexible Data-Rate) protocol. The
CAN interface is isolated using capacitive isolation, which provides excellent EMI protection and ensures reliable communication in
industrial and automation applications.
A terminal resistor of 120Ω has been installed by default.
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
14

Note
This should be done with caution, if files on a filesystem are open they will not be closed.
Note
For more detail about PoE, please check section "2.1.2 Power Supply".
Note
Please note that the standard version of reTerminal DM does not come with a 4G module. If you require 4G functionality, an additional 4G module must be
purchased separately. For more information, please refer to section "2.3.2 4G Module".
2.2.14 Audio Jack
The reTerminal DM has a 3.5mm headphone jack, which supports sound output, and can be connected to external headphones,
speakers, etc. It should be noted that the headphone jack only supports sound output and does not support the microphone
recording function.
2.2.15 HDMI
The reTerminal DM features a native HDMI interface from CM4, supporting up to 4K @ 60 fps video output. It is ideal for applications
that require multiple displays, allowing users to output their content to external large screens.
2.2.13 Reset Hole
There is a Mini Push Button Switch located in the reset hole of reTerminal DM. By pressing this button with a thin object, the CM4
can be reset. This button is connected to the RUN_PG pin of the CM4. This pin when high signals that the CM4 has started. Driving
this pin low resets the module.
reTerminal DM
© 2009-2023 Seeed Technology Co.,Ltd. All rights reserved.
2.2.12 SIM Slot
The reTerminal DM uses a standard-size SIM card slot commonly found in industrial applications, which requires a standard SIM card
with dimensions of 25mm x 15mm.
2.2.16 Ethernet RJ45
The reTerminal DM comes with a CM4 native Gigabit Ethernet interface that supports three different speeds: 10/100/1000 Mbit/s. An
additional PoE module can be purchased to enable power-over-Ethernet (PoE) delivery through this interface, providing power to
the reTerminal DM.
Note
For more detail about PCIe expansion module, please check section "2.3.5 PCIe Expansion Card”
Furthermore, reTerminal DM can support up to three Gigabit Ethernet interfaces through a PCIe expansion module. This is particu-
larly useful for industrial applications that require simultaneous connections to both IT and OT networks or for scenarios that
require connecting to different subnets.
15

Note
Please note that the reTerminal DM is shipped with an RTC battery, if you need to replace the battery please refer to section 3.9 RTC Battery Replacement.
2.2.19 Watchdog
The reTerminal DM comes equipped with an independent hardware watchdog circuit that ensures automatic system reboot in
case of abnormal system crashes. The watchdog circuit is implemented through RTC and allows for flexible feeding times from 1 to
255 seconds.
2.2.18 RTC
The reTerminal DM features an RTC circuit that comes pre-installed with a CR2032 battery, enabling it to maintain timekeeping
functionality even in the event of power loss.
2.2.17 40-Pin GPIO
The classic Raspberry Pi 40-pin GPIO design is retained inside the reTerminal DM, and the pin definition remains the same as the
Raspberry Pi 4B. Users need to open the back cover to use these GPIOs, please refer to section 3.1 for detailed steps. It should be
noted that due to the limited resources of CM4 IO, the 40-pin GPIO and many peripheral interfaces are multiplexed, so you need to
pay special attention to the conflict when using GPIOs. For detailed pin assignment information, please refer to the following table.
Description Pin multiplexing Pin multiplexing Description
Pin 1 3V3
40PIN
5V
IIC1_SDA GPIO2 5V
IIC1_SCL GPIO3 GND
IIC3_SDA GPIO4 GPIO14 UART0_TXD USB Type C
GND GPIO15 UART0_RXD
Digital input via screw terminal DI2 GPIO17 GPIO18 PCM_CLK 3.5mm audio jack
Interrupt pins for screen touch TP_INT GPIO27 GND
Digital input via screw terminal DI3 GPIO22 GPIO23 DI4 Digital input via screw terminal
3V3 GPIO24 DO1 Digital output via screw terminal
CAN and LoRa®
module
SPI0_MOSI GPIO10 GND
SPI0_MISO GPIO9 GPIO25 DO2 Digital output via screw terminal
SPI0_SCLK GPIO11 GPIO8 SPI0_CE0 SPI enable pins for CAN
GND GPIO7 SPI0_CE1 SPI enable pins for LoRa®
ID_SD ID_SC
IIC3_SCL GPIO5 GND
Digital output via screw terminal DO4 GPIO6 GPIO12 CAN_INT Interrupt pins for CAN
LCD backlight control pins LCD_PWM GPIO13 GND
3.5mm audio jack PCM_FS GPIO19 GPIO16 DI1 Digital input via screw terminal
Digital output via screw terminal DO3 GPIO26 GPIO20 PCM_DIN 3.5mm audio jack
GND GPIO21 PCM_DOUT 3.5mm audio jack
reTerminal DM
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