Waveshare Dual ETH Quad RS485 Base Board (B) for Raspberry Pi CM4

DescriptionSpecificationsCM4 SOCKETsuitable for all variants of Compute Module 4NETWORKINGGigabit Ethernet RJ45 connector, 100M Ethernet RJ45 connectorCONNECTORIsolated RS485 × 4, Power screw terminal × 1USBUSB 2.0 Type A × 2CAMERAMIPI CSI-2 port × 2 (15pin 1.0mm FPC connector)VIDEOHDMI port × 1, supports 4K 30fps outputRTCReal-time clock with battery socket and ability to wake Compute Module 4STORAGEMicroSD card socket for Compute Module 4 Lite (without eMMC) variantsFAN HEADERallows speed adjustment, 5VINDICATORPower indicator × 1, CM4 status indicator × 1, User LED × 2, RS485 communication indicator × 8POWER INPUT7-36VDIMENSIONS93.6 × 108.8mmConnecting With Compute Module 4Standard CM4 Socket And Suitable For All Variants Of Compute Module 4More Rich InterfacesVarious Interfaces Including: Dual ETH / RS485 / CSI / FAN / HDMI / Micro SD / USBApplication ExamplesSuitable For Raspberry Pi Applications Requiring Multi-Channel RS485 Communication Or Other Industrial Contextfor reference only, CM4, display, and cameras are NOT included.What’s On BoardCM4 socket suitable for all variants of Compute Module 4IO-VREF Set the CM4 IO logic level as 3.3V (default) or 1.8VRTC-12C: 12C bus selection for RTC Can choose SDA0 & SCLO (default) or GPIO2 & GPIO3RTC INT: RTC interrupt pin select D16: Use GPIO16 to receive interrupt signal when RTC interruption (default) GL-EN: CM4 powerdown on RTC interruption PI-RUN: CM4 will reboot on RTC interruptionSYSTEM: System function configuration WP-DIS: Prevent EEPROM from being overwritten BT-DIS: Disable Bluetooth function, for CM4 with antenna variant ONLY WIFI-DIS: Disable WiFi function, for CM4 with antenna variant ONLYBoot ON: CM4 will be booted from USB-C interface OFF: CM4 will be booted from eMMC or Micro SD cardPWR & USB When the BOOT switch is “ON”, can be used as the USB programming or DC power supply port When the BOOT switch is “OFF”, only used as the DC power supply portHDMI0 HDMI port, supports 4K 30fps outputUSB 2x USB 2.0, for connecting sorts of USB devicesETHERNET0 CM4 original Gigabit RJ45 ETHETHERNET1 USB extended 100M ETHCAM0 & CAM1 2x MIPI CSI camera portsBuzzer GPIO22 controlFAN 4-pin FAN header, only supports 5V FAN, allows PWM speed adjustment (GPIO18 control, speed measurement is not supported)RTC battery socket Supports CR1220 button cellRS485 TX/RX indicator TXn: TX indicator for channel n RXn: RX indicator for channel nUser LED USER0: GPIO20 control USER1: GPIO26 controlPWR Raspberry Pi power indicatorACT Raspberry Pi working status indicatorDC 7~36V DC power supply interfacePower input terminal DC power supply terminal, supports 7~36V wide range power inputRS485 terminal 4 x Isolated RS485 terminal with a spacing of 5.08mmJumper 120R Balance Resistor Selection JumperRS485 operating mode selection Full-auto: automatic mode, easy for program operation but the load capacity is weak Semi-auto: semi-automatic mode, which requires manual TX/RX switching, with high reliability and strong load capacityEncryption chip ATSHA204 encryption chip, providing multiple encryption to ensure data security and reliabilityMicro SD card slot for connecting a Micro SD card with pre-burnt image (Lite variant ONLY)Outline DimensionsWIKI: CM4-ETH-RS485-BASE-B