Raspberry Pi CM4
Ethernet, WiFi, Bluetooth, Serial Port, GPIO, HDMI, I2C, SD, USB, RTC, Buzzer, M.2 (for 5G), Mini-PCIe (for 4G/NB-IoT/LoRa), DI*1, DO*1
Raspberry Pi CM3
RS232 / RS485 / RS422 * 2
Ethernet, USB 2.0 * 2+1 (onboard)
HDMI, RTC, Buzzer, I2C, mini-PCIe, SPI
DI * 8, DO * 4, AI * 4
Modbus TCP to RTU/ASCII
Wired and WiFi
1 / 2 / 4 Serial ports
LoRa up to 5 km
Modbus / Serial / Ethernet over LoRa
Modbus Digital I/O over LoRa
USB to RS232 with 5V power
Power supply not needed for RS232 Device if its pin 9 can accept 5V power
Serial over Bluetooth
Bluetooth 2.1 to Serial
Bluetooth 5.0 to Serial
Serial over IP
Wired and WiFi
1 / 2 / 4 Serial ports over IP
No need of power supply for RS232 device if RS232 device pin 9 accepts 5V power
Reliable operation and able for 9V-24V jack power input or PoE.
RS232/RS485/RS422, Ethernet, USB 2.0, HDMI, RTC, Buzzer, I2C, mini-PCIe , SPI, DI, DO, AI
Reliable operation of barcode scanner
Barcode Slot/Pen Scanner
1D Barcode Scanner
2D Scanner QR Code Scanner
Raspberry Pi CM3 – LoRa – Modbus – Serial Server – RS232 RS422 RS485 – Ethernet WiFi Bluetooth – Digital Analog I/O – Barcode Scanner