Product description: Dual ETH Quad RS485 Base Board (B) - pins expander for Raspberry Pi Compute Module 4 - Waveshare 21666
Dual ETH Quad RS485 Base Board (B) is a board manufactured by Waveshare . It acts as a base board, a terminal expander designed to extend the capabilities of Raspberry Pi CM4 modules. It is equipped with special connectors for connecting the CM4 module and the outputs of the basic interfaces, including 2x USB 2.0 , 2x RJ45 Ethernet , HDMI , 2x CSI and 4x RS485 isolated interfaces.
Dual ETH Quad RS485 Base Board (B) - pins expander for Raspberry Pi Compute Module 4.
Dual ETH Quad RS485 Base Board (B).
Technical Specifications
- Compatible with Raspberry Pi Compute Module 4
- Equipped with Gigabit Ethernet RJ45 connector, 100 Mb / s Ethernet RJ45 connector
- Equipped with 4x isolated RS485
- USB interface: 2x USB type A
- Camera connector: 2x MIPI CSI-2 port (15-pin FPC 1.0mm connector)
- Video connector: 1x HDMI port, supports 4K 30fps output
- Real time clock (RTC) with battery backup
- MicroSD card slot for RPI CM4 Lite modules
- 5V PWM fan controller with feedback
- LED indicators: 1x power indicator, 1x CM4 status indicator, 2x user LED indicator, 8x RS485 communication indicator
- Power supply: 7V to 36V
- Dimensions: 93.6 x 108.8 mm
The arrangement of elements on the board
- CM4 socket for all Compute Module 4
- IO-VREF
- RTC-12C: 12C bus selection for RTC
- RTC INT: Select the RTC interrupt pin
- SYSTEM: Configure system functions
WP-DIS: Prevents EEPROM from being overwritten
BT-DIS: Disables the Bluetooth function, ONLY for CM4 with antenna variant
WIFI-DIS: Disables the WiFi function, ONLY for CM4 with antenna variant - Boot switch
ON: CM4 will boot from USB Type-C interface
OFF: CM4 will boot from eMMC or microSD card - USB Type-C connector
When the BOOT switch is in the "ON" position, USB can be used as a USB programming or DC power port
When the BOOT switch is in the "OFF" position, the USB port can only be used as a DC power port - HDMI port0
- 2x USB port
- Gigabit RJ45 Ethernet connector
- 100 Mb / s Ethernet connector
- CAM0 and CAM1: 2x MIPI CSI camera ports
- Buzzer
- Fan connectors
- RTC battery socket
- RS485 TX / RX indicator
TXn: TX indicator for channel n
RXn: RX indicator for channel n - User LED
USER0: GPIO20 control
USER1: GPIO26 control - PWR power indicator
- Raspberry Pi working status indicator
- DC jack (7V to 36V DC)
- Screw connection for power supply (7V to 36V DC)
- RS485 terminal : 4x RS485 insulated terminal with 5.08 mm pitch
- Balancing resistor selection jumper
- RS485 operation mode selection
Full-auto: automatic mode, easy to program operation, with low load capacity
Semi-auto: semi-automatic mode which requires TX / RX manual switching, with high reliability and heavy load capacity - ATSHA204 encryption chip, providing multiple encryption to ensure data security and reliability
- MicroSD card slot
Dual ETH Quad RS485 Base Board (B) - pins expander for Raspberry Pi Compute Module 4 - Waveshare 21666.
