RS485 Firmware Developer

Garhwa - India

Monthly Salary: Not Disclosed

Posted on: 4 hours ago

Vacancies: 1 Vacancy

Job Summary

Key Responsibilities / Duties

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.

Integrate device registers attributes and configuration parameters.

Hardware Bring-Up and amp; Driver Layer

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.

Implement fail-safe mechanisms watchdog error handling and power optimization.

System Architecture and amp; Integration

Design scalable communication architecture for multi-node RS485 networks.

Integrate RS485 nodes with gateways or master controllers.

Manage device addressing discovery collision avoidance and message prioritization.

Debugging and amp; Validation

Use logic analyzers oscilloscopes serial protocol analyzers for debugging.

Conduct network-level stress testing noise handling and EMI/EMC validation.

Optimize baud rates timing windows and stability across long cable runs.

Documentation and amp; Compliance

Create firmware documentation communication protocol documents and command maps.

Prepare release notes structure registers and integration guides for developers and installers.

Cross-Team Collaboration

Work with QA hardware app and cloud teams for seamless product integration.

Participate in architecture discussions sprint planning and design reviews.

Required Skills

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.

Experience using debuggers and tools: JTAG SWD Saleae/logic analyzer oscilloscope.

Good to Have

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.

Key Responsibilities / DutiesFirmware DevelopmentDevelop 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-...