Details
Dual ETH Quad RS485 Base Board (B) for Raspberry Pi Compute Module 4, Gigabit Ethernet, 4CH Isolated RS485, USB2.0
Dual ETH Quad RS485 Base Board for CM4
Designed For Raspberry Pi Compute Module 4
Specifications
| CM4 socket | suitable for all variants of Compute Module 4 |
|---|---|
| Networking | Gigabit Ethernet RJ45 connector, 100M Ethernet RJ45 connector |
| Connector | Isolated RS485 × 4, Power screw terminal × 1 |
| USB | USB 2.0 Type A × 2 |
| Camera | MIPI CSI-2 port × 2 (15pin 1.0mm FPC connector) |
| Video | HDMI port × 1, supports 4K 30fps output |
| RTC | Real-time clock with battery socket and ability to wake Compute Module 4 |
| Storage | MicroSD card socket for Compute Module 4 Lite (without eMMC) variants |
| Fan header | allows speed adjustment, 5V |
| Indicator | Power indicator × 1, CM4 status indicator × 1, User LED × 2, RS485 communication indicator × 8 |
| Power input | 7-36V |
| Dimensions | 93.6 × 108.8mm |
Connecting with Compute Module 4
standard CM4 socket and suitable for all variants of Compute Module 4
More Rich Interfaces
Various Interfaces Including: Dual ETH / RS485 / CSI / FAN / HDMI / Micro SD / USB
Application Examples
Suitable For Raspberry Pi Applications requiring Multi-Channel RS485 Communication Or Other Industrial Context
for reference only, CM4, display, and cameras are NOT included.
What's On Board
- CM4 socket
suitable for all variants of Compute Module 4 - IO-VREF
Set the CM4 IO logic level as 3.3V (default) or 1.8V - RTC-12C: 12C bus selection for RTC
Can choose SDA0 & SCLO (default) or GPIO2 & GPIO3 - RTC 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 interruption - SYSTEM: 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 ONLY - Boot
ON: CM4 will be booted from USB-C interface
OFF: CM4 will be booted from eMMC or Micro SD card - PWR & 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 port - HDMI0
HDMI port, supports 4K 30fps output - USB
2x USB 2.0, for connecting sorts of USB devices - ETHERNET0
CM4 original Gigabit RJ45 ETH - ETHERNET1
USB extended 100M ETH - CAM0 & CAM1
2x MIPI CSI camera ports - Buzzer
GPIO22 control
- FAN
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 cell - 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
Raspberry Pi power indicator - ACT
Raspberry Pi working status indicator - DC 7~36V
DC power supply interface - Power input terminal
DC power supply terminal, supports 7~36V wide range power input - RS485 terminal
4 x Isolated RS485 terminal with a spacing of 5.08mm - Jumper
120R Balance Resistor Selection Jumper - RS485 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 capacity - Encryption chip
ATSHA204 encryption chip, providing multiple encryption to ensure data security and reliability - Micro SD card slot
for connecting a Micro SD card with pre-burnt image (Lite variant ONLY)
Outline dimensions
What's the differences
| CM4 Base Board | Interface count and specifications | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PoE | Gigabit ETH |
40PIN GPIO |
PCIe | USB① | DSI | HDMI | CSI | RTC | Fan Header |
Power Input |
Features | |
 NANO A |
√ | 2.0×1 | ×1 | 5V | CM4 sized | |||||||
 NANO B |
×1 | √ | 2.0×1 | ×1 | ×1 | ×1 | 5V | CM4 sized | ||||
 NANO C |
√ | 2.0×1 | ×1 | ×1 | ×1 | 5V | Onboard Camera | |||||
 mini Base A |
×1 | √ | M.2 M | 2.0×4 | ×1 | ×2 | ×2 | 5V | 5V | mini size | ||
mini Base B |
×1 | √ | M.2 M | 2.0×4 | ×1 | ×2 | ×2 | √ | 5V | 5V | mini size | |
 mini Base C |
×1 | √ | M.2 M | 2.0×2 | ×1 | ×2 | √ | 5V | 5V | Dedicated 40PIN LCD Connector | ||
 Touch screen |
×1 | M.2 M | 2.0×4 | ×1 | ×1 | 5V | IPS screen | |||||
 Mini Dual Gigabit |
×2 | √ | 2.0×1 | 5V SH1.0 | 5V | dual ETH | ||||||
 Binocular camera |
×1 | √ | M.2 M | 2.0×4 | ×2 | 5V | dual 8MP cameras |
|||||
 4CH RS485 |
×1 | 2.0×2 | ×1 | ×2 | ×1 | 5V | 7-36V | dual ETH | ||||
 WIFI6 DUAL ETH |
×1 | √ | M.2 E | 2.0×3 | ×1 | ×2 | ×2 | ×1 | 5/12V | 7-36V | WIFI6 dual ETH | |
 Dual Gigabit ETH |
×2 | √ | 3.0×3 | ×1 | ×2 | ×2 | √ | 5/12V | 7-36V | |||
 IoT Dual Gigabit ETH |
×2 | √ | 3.0×2 | ×1 | ×2 | ×2 | √ | 5/12V | 5V | 5G/4G support | ||
 IoT Base |
√ | ×1 | Gen2×1 | 2.0×2 | ×2 | ×2 | ×2 | √ | 5/12V | 7-36V | 5G/4G support RS232 RS485 ADC |
|
 PoE Base (B) |
√ | ×1 | √ | Gen2×1 | 2.0×4 | ×2 | ×2 | ×2 | √ | 5/12V | 5V | RS232 RS485 |
 PoE UPS Base |
√ | ×1 | √ | M.2 M | 2.0×4 | ×1 | ×2 | ×2 | √ | 5/12V | 7-36V | UPS |
 PoE Base |
√ | ×1 | √ | 3.0×4 | ×2 | ×2 | ×2 | √ | 5/12V | 7-36V | ||
 Raspberry Pi official |
② | ×1 | √ | Gen2×1 | 2.0×4 | ×2 | ×2 | ×2 | √ | 12V | 12V | |
 Wireless base |
×1 | M.2 B / Mini-PCIe |
2.0×3 | ×1 | ×1 | √ | 5/12V | 5V or 7-36V |
5G/4G support RS485 CAN rail-mount |
|||
 UPS Wireless base |
×1 | M.2 B | 2.0×3 | ×1 | ×1 | √ | 5/12V | 5V or 7-36V |
With UPS 5G/4G support RS485 CAN rail-mount |
|||
 NAS Mini Computer |
×2 | √ | M.2 M×2/ Mini-PCIe |
3.0×2 | ×2 | ×2 | √ | 5V | dual M.2 M KEY slots | |||
 5″ touch screen |
② | ×1 | √ | M.2 M | 2.0×4 | ×1 | ×2 | √ | 5/12V | 5V | ||
 7″ all-in-one |
×1 | M.2 M | 2.0×4 | used | ×1 | used | √ | 5/12V used |
7-36V | touch screen camera speaker |
||
 13.3″ all-in-one |
×1 | 2.0×2 | 12V | HD touch screen | ||||||||
 13.3″ Magic Mirror |
×1 | 2.0×2 | 12V | HD screen, Speech Assistant |
||||||||
| Note | ① USB 3.0 is equivalent to USB 3.2 Gen1 ② There's PoE header only on the Raspberry Pi official IO board without PoE circuit, that means additional PoE module is required for the official IO board to enable PoE feature. Unless otherwise specified, the PoE feature here stands for integrating 802.3af-compliant PoE circuit (5V/2.5A). |
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Resources & Services
* Resources for different product may vary, please check the wiki page to confirm the actually provided resources.
Weight: 0.1 kg
Quick Overview
- CM4-ETH-RS485-BASE-B x1
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