The RevPi Connect 4 (4 GB / 32 GB) is based on the Raspberry Pi Compute Module 4 (CM4) and offers a modular design, industrial capability and open source support. It is driven by a Broadcom BCM2711 processor (64-bit quad-core arm Cortex-A72). The RevPi Connect 4 features 8 GB RAM, 32 GB eMMC memory and supports up to ten I/O modules. The interfaces include two Gigabit Ethernet, two USB 3.2 Gen1, RS485, one Micro-HDMI and one Micro-USB port. The device contains an integrated real-time clock (RTC) and a hardware watchdog. A HAT EEPROM stores device information. Six RGB LEDs are on the front panel, five of which are individually programmable. It comes with a pre-installed, customized 64-bit Raspberry Pi OS (including real-time patch and process image). Modbus RTU and Modbus TCP are supported by default. In addition, control and HMI software can be installed. The RevPi Connect 4 supports protocols such as MQTT and OPC UA, and allows you to develop your own applications with Node-RED, Pytho