Feature: 1. MULTI INTERFACE: Based on for Raspberry Pi CM4 design with UPS industrial expansion module, the board has Gigabit Ethernet, HD multimedia interface, USB and GPIO and other common interfaces. 2. M.2 B KEY INTERFACE: Wireless expansion module supports the external connection of 4G/5G wireless communication modules through M.2 B KEY, and also extends industrial interface resources such as RS485, CAN and RTC. 3. AUTOMATIC SWITCHING: Expansion module access to external power supply, will simultaneously power the system and lithium battery charging disconnect the external power supply, will automatically switch to lithium battery power supply, on board UPS module, disconnect the power line can still work normally. 4. APPLICATIONS: The industrial rail housing design is very suitable for building IoT gateways, 4G/5G routers, IoT data acquisition, or even using it as a programmable logic controller in industrial automation and control systems, etc. 5. PCB MATERIAL: CM4 industrial expansion module is made of PCB material, which will not deform for a long time, thus ensuring the stability for a long time. Specification: Item Type: Industrial IoT Wireless Expansion Module Material: PCB CM4 Connector: Available for All Versions for Compute Module 4 HD Multimedia Interface: HD Multimedia Interface, Supports 4K 30fps Output USB 2.0 Interface 3 Way 2.0 Interface, Support Various USB Devices Plug RJ45 Gigabit LAN Port: RJ45 Gigabit LAN Port, Supports 10/100/1000M Network Access DC Power Supply Interface: 7 to 36V DC Power Supply Interface CM4 Status Indicator: Red Light (PWR): for Raspberry Pi Power Indicator Green Light (ACT): for Raspberry Pi Operating Status Indicator 4G/5G Module Status Light: Red(STA): for Module Enable Indicator Green Light (NET): Module Operation Status Light PWR USB Interface: 5V DC Power Supply Interface or USB Burns in Interface M.2 B KEY: Support Access to 4G/5G or Other USB Channel Communication Module SIM Card Holder: Can Access Standard SIM Card for 4G/3G/2G Internet Access BOOT SWITCH BUTTON: ON: for Compute Module 4 Boot up and Boot Transfer to USB Type C Interface OFF: Boot Up for Compute Module 4 to eMMC or Micro Storage Card UPS Switch Button: ON ON: Turn on the UPS to Power the CM4 OFF: Turn off the UPS to Power the CM4 DC Power Supply Interface: 7 to 36V DC Power Supply Interface Dual Non Isolated RS485 Interface: Dual RS485 Interface with 600W, Surge and 15KV Electrostatic Protection (120R Optional Balanced Resistance Jumper Hat Reserved) Non Isolated CAN Interface: Static and Transient Spike Voltage Protection (120R Optional Balancing Resistor Jumper Hat Reserved) Micro Storage Card Interface: for Access to Micro Storage Card with System to Boot for Compute Module 4 Lite FAN Power Supply Option: Selectable 5V or 12V to Drive the Fan CAM Interface: MIPI CSI Camera Interface RTC Battery Connector: Access to CR1220 Coin Cell Battery M.2 VCC Power Supply Option: Select 3.3V or 4.2V Power Supply RTC Interrupt Pin Switching: PI-RUN PI-RUN: RTC Trigger Interrupt CM4 Restart GN-EN: RTC Trigger Interrupt CM4 Power Off D4: RTC Trigger Interrupt D4 Pin IO VREF Selection: CM4 IO Logic Voltage Switch 3.3V or 1.8V FAN Power Supply Selection: 12V (Default) or 5V Voltage Can Be Selected to Drive the Fan System Function Switching: BT_DIS: Bluetooth Disable, only for CM4 Version with Antenna WiFi_DIS: WiFi Disable, only for CM4 Version with Antenna WP_DIS: Boot Mode Toggle, For Use Only if EMMC Boot or Storage Card boot is Not Used RTC/FAN I2C Bus Selection: SDA0/SCL0: I2C-10 and CSI/DSI Shared GPIO3/2: I2C 1 and 40PIN Shared Partial GPIO Interface: Contains One Set of I2C and 2 GPIOs and Power Supply UPS Module Mini Interface: Uses 10440 3.7V Lithium Battery Battery Specifications: 3x10440 Li Ion 350mAh (Ship with Inbuilt Battery). Package List: 1 x Expansion Module (Ship with Inbuilt Battery)3 x Battery1 x Screwdriver Note: 1. Prohibit unplugging any device other than USB and HD Multimedia Interface when powered2. Confirm the fan voltage before connecting, support 5V and 12V connect 12V by default, switch please modify the FAN_VCC resistance3. In order to ensure the CM4 power supply is normal, please do not connect other devices when using Type C interface to burn the image.4. The module needs to be supplied with 5V 2.5A /12V 1A or higher power supply. Otherwise, there may be automatic shutdown, downconversion and other problems.The UPS module's power switch needs to be set to the OFF position and the CM4 backplane switch to the ON position to use.6. USB2.0 is off by default7. When using the UPS alone, the circuit should not exceed 2.5A, long working hours in