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IsoGuard-48
Monitoring and control node for telecom enclosures — smoke, flood and temperature sensing with multi-interface communications.
- ESP32-S3
- RS-485
- −48V Isolated
- Altium Designer
Problem
Remote telecom enclosures run from a −48V rail and need environmental sensing plus contact monitoring that survives the electrical environment they sit in.
System overview
An industrial-grade node built around the ESP32-S3, powered from an isolated −48V input, with isolated RS-485 communications and more than twelve dry-contact channels for sensors and status signals.
- 01Smoke / flood / temperature sensors
- 0212+ dry-contact channels
- 03ESP32-S3
- 04Isolated RS-485
- 05Supervisory system
Responsibilities
- Hardware architecture, schematic and PCB layout
- Isolated power and input protection design
- Firmware for sensing, contact monitoring and communications
- Prototype bring-up and validation
Hardware architecture
- ESP32-S3 application processor
- Isolated −48V input stage
- Isolated RS-485 transceiver
- 12+ dry-contact channels
- Smoke, flood and temperature sensor interfaces
Firmware architecture
- Sensor acquisition and contact-state monitoring
- RS-485 based communications
- Event reporting and threshold handling
Communication interfaces
- RS-485
- Dry contacts
- Analog / digital sensor inputs
Engineering challenges
- Isolating a −48V telecom rail from low-voltage logic on a compact board
- Providing a high dry-contact channel count without compromising layout or noise immunity
Hardware & diagrams
