RS485 Firmware Developer
Confio ↗
📍 Bengaluru, India 🇮🇳
full-time
mid-level
Expired
Posted —
This job posting has expired
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Key Skills
C/C++RS485ModbusUARTSTM32
Industry
Consumer ElectronicsIndustrial Automation
Job Description
Key Responsibilities / Duties
Firmware Development
Firmware Development
- Develop and optimize firmware for RS485-based communication modules used in home automation devices.
- Implement Modbus RTU/ASCII or custom RS485 frame protocols as required.
- Handle polling, addressing, CRC checks, retries, retries logic, debouncing, and multi-device communication.
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Integrate device registers, attributes, and configuration parameters.
- Work closely with hardware engineers for board bring-up, transceiver (MAX485, SP3485, SN65HVD) integration.
- Develop low-level drivers (UART, timers, DMA) for high-performance communication.
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Implement fail-safe mechanisms, watchdog, error handling, and power optimization.
- Design scalable communication architecture for multi-node RS485 networks.
- Integrate RS485 nodes with gateways or master controllers.
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Manage device addressing, discovery, collision avoidance, and message prioritization.
- Use logic analyzers, oscilloscopes, serial protocol analyzers for debugging.
- Conduct network-level stress testing, noise handling, and EMI/EMC validation.
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Optimize baud rates, timing windows, and stability across long cable runs.
- Create firmware documentation, communication protocol documents, and command maps.
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Prepare release notes, structure registers, and integration guides for developers and installers.
- Work with QA, hardware, app, and cloud teams for seamless product integration.
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Participate in architecture discussions, sprint planning, and design reviews.
- Strong C/C++ embedded programming.
- Hands-on experience with RS485 communication and Modbus (RTU/ASCII) or equivalent.
- Clear understanding of UART driver development (interrupt-driven, DMA-based).
- Knowledge of CRC algorithms, buffer management, timeouts, and robust packet parsing.
- Practical experience with timers, watchdogs, bootloaders, and OTA (bonus).
- Experience with microcontrollers: STM32, ESP32, NXP, TI MSP/CC series, PIC, or similar.
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Experience using debuggers and tools: JTAG, SWD, Saleae/logic analyzer, oscilloscope.
- Experience with home automation protocols (Zigbee, Z-Wave, KNX, MQTT).
- Experience with RS485 master/RTU gateway products.
- Knowledge of FreeRTOS or similar RTOS.
- Exposure to cloud integration through gateways.
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Key Skills
C/C++RS485ModbusUARTSTM32
Industry
Consumer ElectronicsIndustrial Automation
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