RS232 M2M Controller RESI-T4

CANopenModbusTCP/IP

USE THE POWER OF RASPBERRY PI® 4 IN YOUR SOLUTIONS
RESI has used Raspberry Pi® products since the Pi 2 era and installed thousands of controllers in projects across building automation and industrial applications. The RESI T4 line packages the original Raspberry Pi® 4 board into an industrial-grade controller designed for DIN-rail and wall mounting, providing a ready-to-deploy IoT controller for integrators and OEMs.

WHAT'S DIFFERENT?
The standard Raspberry Pi® 4 board is integrated into an industrial housing that fits enclosures with a 45 mm front-panel cutout commonly found in building automation. An integrated wide-range power supply accepts 12–48 V DC. An ARM® co-processor manages serial interfaces (RS232, RS485 or KNX) and adds features: unique 96-bit serial number, 2 kB ferromagnetic RAM for persistent values, real-time clock with backup capacitor, status LEDs and a DIP switch for software functions. Selected models offer CAN 2.0 and CAN-FD. Standard Raspberry Pi® 4 interfaces remain accessible.

KEY HARDWARE FEATURES

• Industrial housing for DIN-rail and wall mounting; compatible with 45 mm front-panel cutout
• Wide-range power supply: 12–48 V DC
• ARM® co-processor for serial interface handling and additional functions
• Co-processor extras: unique 96-bit serial number, 2 kB ferromagnetic RAM (persistent), real-time clock with backup capacitor, status LEDs, DIP switch
• Optional CAN support: CAN 2.0 and CAN-FD on selected models
• Raspberry Pi® 4 standard interfaces: 2× HDMI, 1× Ethernet, 3× USB (one used internally), 1× Audio out, onboard WLAN & BLE
• Memory options: 2 GB / 4 GB / 8 GB RAM; delivered with 32 GB SD card and Linux OS

HOW TO USE IN LINUX ?
The ARM® co-processor is exposed as a USB-attached serial device available as /dev/ttyACM0. No special Linux distribution or driver is required. Two access methods are provided: a simple ASCII command set (e.g. #VERSION, #GRTC) and a MODBUS/RTU master protocol to control all co-processor features.

HOW TO USE THE SERIAL INTERFACES ?
The co-processor maps each RS485, RS232 or KNX interface to USB serial devices /dev/ttyACM1 through /dev/ttyACM3. These appear as native serial ports in Linux. Time-critical RS485 direction switching is handled by the co-processor, removing timing constraints from the host OS.

SOFTWARE

• Development and runtime: Node-RED, Node.js, Python, Java, JavaScript, HTML, C#, C++, Scratch
• Databases: MariaDB, MongoDB, InfluxDB, PostgreSQL
• Visualization / UI: Grafana, Apache
• Home automation: OpenHAB, FHEM, Home Assistant, ioBroker
• Cloud connectivity: MQTT, HTTPS, Azure IoT, AWS web services
• VPNs & routing: OpenWrt, OpenRouter, OpenVPN, WireGuard
• Multimedia: KODI
• Industrial PLC: CODESYS

DOCUMENTS AND ATTACHMENTS
Product manuals, attachment documents, ASCII/MODBUS command lists and declarations of conformity are available as product PDFs (model-specific manuals, attachments and interface mapping documents).

TECHNICAL SPECIFICATIONS

• Product family / model: RESI T4 industrial Raspberry Pi® 4-based IoT controller
• Power input: 12–48 V DC (wide range)
• Mounting: DIN-rail and wall mounting; compatible with 45 mm front-panel cutout
• Co-processor: ARM® co-processor providing serial interface handling, unique 96-bit serial number, 2 kB ferromagnetic RAM, RTC with backup capacitor, status LEDs, DIP switch
• Serial interfaces: configurable RS232 / RS485 / KNX on interface slots; RS485 direction switching managed by co-processor
• USB serial mapping: co-processor on /dev/ttyACM0; interfaces mapped to /dev/ttyACM1 – /dev/ttyACM3
• CAN: optional CAN 2.0 and CAN-FD on select models
• Raspberry Pi® 4 interfaces: 2× HDMI, 1× Ethernet, 3× USB (one used internally), 1× Audio out, onboard WLAN & BLE
• RAM options: 2 GB / 4 GB / 8 GB
• Storage: delivered with 32 GB SD card and Linux OS
• Protocols supported: ASCII command set and MODBUS/RTU master; cloud protocols MQTT, HTTPS, Azure IoT, AWS web services
• Software compatibility: wide range of open-source Linux tools and databases; supports applications from Node-RED to industrial CODESYS
• Typical use cases: building automation, IoT gateways, industrial controllers, home automation, VPN/router, multimedia and PLC solutions