{"repo":"OpenModbus/OM-64DO","free":true,"listed":false,"github":"https://github.com/OpenModbus/OM-64DO","clone":"git clone https://github.com/OpenModbus/OM-64DO.git","description":"A compact industrial-grade 64-channel Modbus RTU output module.","language":"C","stars":19,"topics":["automation","expansion-board","modbus","modbus-rtu","module","pcb","plc","relay","smarthome"],"license":"GPL-3.0","category":"workflow-automation","readme_excerpt":"Open Modbus OM-64DO A compact industrial-grade 64-channel Modbus RTU output module featuring low-side drivers, per-channel LEDs, wide input voltage, DIN-rail support, and full configuration via Modbus holding registers. Designed for automation, distributed I/O, and custom control applications. 1. Product Overview The Open Modbus OM-64DO is a 64-channel low-side output expansion module intended for industrial automation, machine control, and distributed I/O networks using Modbus RTU over RS-485. It switches DC loads such as solenoids, relays, indicator lamps, locks, and alarms up to 48 VDC . The module combines an STM32G031 microcontroller, four MCP23S17 SPI expanders , and eight TBD62083 Darlington driver arrays . This architecture enables reliable, flexible, and scalable output control with built-in protection and per-channel LED indication. 📦 Hardware Files The full schematic and BOM are available at: - Schematic → https://github.com/OpenModbus/OM-64DO/blob/main/assets/schematics.pdf - BOM → https://github.com/OpenModbus/OM-64DO/blob/main/assets/bom.csv Check the latest release for more! 2. Key Features - 64 open-collector low-side outputs - Up to 500 mA per output , 2 A max per driver package - 5–48 VDC recommended load voltage (50 V absolute maximum) - Wide supply input: 7–28 VDC - RS-485 Modbus RTU communication (THVD1450 transceiver) - Fully configurable serial parameters - Per-channel LED indicators - DEGSON 15EDG pluggable screw terminals - DIN-rail mount using UM72S","default_branch":null,"files":null,"tree":[],"storefront":"/r/OpenModbus","claimed":false,"request_supported":{"post":"https://gitbuyer.com/r/OpenModbus/OM-64DO/request-supported","requests":0},"note":"indexed from public GitHub; nothing is for sale on this page. Clone it from GitHub. Paid listings live at /search."}