SiRcom/ Enhancing Public Safety with Advanced PCB Boards for Siren Control



In the realm of emergency management and public safety, effective siren systems are crucial for alerting communities to imminent threats. SiRcom’s advanced PCB boards are designed to control and manage these siren systems efficiently. With the ability to handle various configurations, from small setups with a few horns to extensive networks with multiple sirens, these PCBs ensure robust performance and reliability. Here’s a detailed look at how SiRcom’s PCBs control sirens and the specific features that make them indispensable for modern siren systems.

How Siren Systems Work with SiRcom’s PCB Boards

Overview of Siren Systems

Siren systems are composed of several key components that work together to deliver loud, clear, and reliable alerts across wide areas. These components typically include:

  • Horns: These are the devices converting a power amplified electrical audio signal into loud siren sounds. They can vary in number, ranging from a few to several dozen, depending on the coverage area needed.
  • Amplifiers: These amplify line audio signals to a high power signal for the horns, ensuring the siren sounds are loud enough to be heard over long distances.
  • Controllers: These are the brains of the operation, creating and managing the signals sent to the amplifiers and horns. They ensure the correct sounds are played at the right times, often integrating with emergency management systems for automated alerts.

SiRcom’s PCB Boards in Siren Control

SiRcom’s PCBs are versatile enough to control various siren configurations, ranging from small setups with just a few horns to large systems with multiple sirens. Here’s how they can be deployed in different configurations:

Small Systems (2-8 Horns)

  • SyCon S  is designed for small to medium siren ideal for small siren systems with up to 8 horns. It provides the necessary amplification and control features to ensure reliable operation. Small community alert systems or localized warning systems can benefit from this configuration, ensuring that critical alerts are delivered efficiently and effectively.

SyCon S: Versatile Control for Small to Medium Systems

  • Amplifier Support: The SyCon S itself can handle up to 4 mono or 2 stereo amplifiers, making it suitable for systems with up to 8 horn sirens. Using an additional adapter SyCon S may handle up to 8 mono or 4 stereo amplifiers extending its capabilities well into the midrange region.
  • Connectivity: With 2 TTL UARTs and 1 RS485 port, it supports robust communication with other system components.
  • Audio Management: It includes 2 AUX audio inputs and 1 microphone input, allowing for diverse audio sources.
  • Power and Storage: The board features AGM charge control and SD support for local data storage, ensuring continuous operation even during power disruptions.
  • Ethernet and Bluetooth Uplink: Ensures reliable communication with network systems and wireless devices.
  • Local data storage: SD-Card slot for storing audio samples and alarm definitions.

Medium Systems (8-16 Horns)


  • SyCon L directly supporting up to 16 horns. Its enhanced connectivity and audio management features make it suitable for more complex installations such as larger campuses or industrial sites that require widespread alert coverage.
  • SyCon S with additional adapter supporting up to 16 horns

SyCon L: Enhanced Capabilities for Larger Systems

  • Extended Amplifier Support: The SyCon L by itself supports up to 8 mono or 4 stereo amplifiers, ideal for larger siren systems with up to 16 horns.
  • RS232 Connectivity: True RS232 on board enhances communication capabilities.
  • Additional Audio Input: A dedicated AUX input for more flexible audio management.
  • Comprehensive Functions: Includes all features of the SyCon S, making it suitable for more extensive installations.
  •   Deprecated USB Option: Although USB functionality is available, it’s recommended to use more robust interfaces.
  •   Local data storage: SD-Card slot for storing audio samples and alarm definitions.

Large Systems (16-120 Horns)

  • SyCon3 is designed for large siren systems directly supporting up to 30 amplifiers driving 120 horns. It offers advanced control features, multiple inputs and outputs, and robust power management to ensure continuous operation. Municipalities or large industrial complexes can utilize this configuration to ensure that all areas receive timely alerts.

Extensive Systems (30+ Amplifiers/ +120 Horns)

  • For very large systems SyCon3 can be used with special high quality cabling extending its capability to virtually >200 amplifiers driving the according number of horns. This scalability makes it possible to cover vast areas with reliable siren alerts. This setup is ideal for noisy  extensive industrial complexes where comprehensive coverage is critical while offering a better clearness of speech announcements than a multi-siren setup.

SyCon3: Advanced Control for Complex and Extensive Systems

  • High Capacity: By itself supports up to 8 mono or 4 stereo amplifiers with individual ON/OFF control, and up to 30 (250) digital audio targets, i.ex. amplifiers.
  • Multiple Ports: Features 2 TTL UARTs, 2 full RS485 isolated ports with dedicated 12V auxiliary power, and 1 isolated RS485 pure data output.
  • Enhanced Inputs and Outputs: Includes 2 AUX audio inputs, 1 microphone input, and a dedicated measurement input for case temperature.
  • Comprehensive Power Management:
    • Accepts direct external power input from [11..54]V, thereby providing compatibility with standard 12V systems, industrial 48V supplies and most standard solar panels.
    • AGM & LiFePo charge control, multiple switchable 12V power output ports
    • Optional emergency lithium buffer retaining basic communication and functions even in case of massive power supply system failure.
  • Expansion and Connectivity:
    • Local expansion port with 8-bit bus, UART and  SPI interfaces
    • Ethernet uplink
    • Bluetooth uplink and BT audio broadcast.
  • Local data storage: SD-Card slot for storing audio samples and alarm definitions.

Additional Modules and Features

GPIO Modules

  • GPIO16-10: Expands the I/O capabilities of the SyCon boards, providing up to 16 isolated digital inputs, up to 6 analog inputs, 6 relay outputs, and up to 4 OD outputs. It receives commands and delivers its messages via a serial uplink to a SyCon, offering extensive customization and control options for various applications.
  • GPIO5: A compact module providing 5 additional I/O points via the 16-pin UART port. Ideal for smaller expansions where fewer additional inputs and outputs are needed.

General-Purpose Input/Output (GPIO) refers to a type of pin found on an integrated circuit that can be used as an input or output. These pins are typically configurable, meaning they can be programmed to read signals (input) or send signals (output). GPIOs are essential in various applications, from simple button presses to complex system controls, because of their versatility and ease of use. In the context of SiRcom’s boards, GPIO modules significantly expand the capability to interface with other devices and sensors, enhancing the overall functionality and adaptability of the system.

Features and Benefits of GPIO:

  • Versatility: GPIO pins can be programmed to perform a wide range of functions, making them suitable for numerous applications.
  • Scalability: Additional GPIO modules like the GPIO16-10 and GPIO5 allow for easy expansion of existing systems’ peripheral device controlling capabilities.
  • Customizability: Users can configure GPIO pins to meet specific needs, whether for digital inputs, analog inputs, or output signals.
  • Enhanced Control: With GPIO modules, users can integrate various sensors, relays, and other peripherals, improving the overall control and monitoring capabilities of their systems.
  • Ease of Integration: GPIO modules are designed to seamlessly interface with SyCon boards, providing a straightforward way to enhance system functionality without extensive rewiring or reconfiguration.

Temperature Sensors

  • Si_TSen: External temperature sensors compatible with GPIO16-10 and SyCon3 for accurate environmental monitoring. These sensors ensure that the system operates within safe temperature ranges, preventing overheating and ensuring longevity and reliability.

Temperature sensors are critical in monitoring and maintaining the optimal operating conditions of electronic systems. By providing real-time data on the system’s thermal status, these sensors help prevent overheating, which can damage components and lead to system failure. The Si_TSen module ensures that SiRcom’s PCBs can continuously monitor their temperature environment, triggering alarms or shutdown procedures if temperatures exceed safe limits.

Features and Benefits of External Temperature Sensors:

  • Accurate Monitoring: Provides precise temperature readings to ensure systems operate within safe parameters.
  • Prevent Overheating: Helps prevent overheating, which can damage sensitive electronic components.
  • System Longevity: By maintaining optimal operating conditions, temperature sensors contribute to the longevity and reliability of the system.
  • Real-Time Data: Offers real-time temperature data, allowing for immediate corrective actions if necessary.
  • Enhanced Safety: Protects both the equipment and personnel by preventing potential overheating hazards.

Solar Regulator & Charger

  • Solar regulator & charger: An intelligent charger for AGM batteries using a solar panel in conjunction with SyConS or SyConL, ensuring sustainable power management for remote siren systems. It reports to and gets commands from a SyCon via a serial interface, making it an eco-friendly and efficient solution for power management.

Solar chargers are devices optimizing power output of solar panels by regulating the load imposed by their input and converting the retrieved electrical power appropriately for charging a battery.

The Solarregulator module is designed to work with AGM batteries, commonly used in siren systems, to provide a reliable and renewable power source. By using solar energy, these chargers reduce dependence on traditional power grids, making the siren systems more resilient in remote or disaster-stricken areas where power infrastructure may be compromised.

Features and Benefits of Solar Chargers:

  • Sustainable Power: Utilizes renewable solar energy to charge batteries, reducing dependence on non-renewable power sources.
  • Remote Operation: Ideal for use in remote or off-grid locations where traditional power infrastructure may be unavailable.
  • Cost-Effective: Reduces operational costs by harnessing free solar energy, lowering electricity bills.
  • Environmentally Friendly: Decreases carbon footprint by using clean, renewable energy.
  • Reliability: In conjunction with the battery provides an additional continuous power supply, ensuring that critical systems remain operational during power outages.

Programming Adapters

  • Si.Prog.Int: Adapter for connecting ULink/Jlink pods to SyCon and GPIO16-10 boards for MCU programming, enabling easy updates and configuration. This ensures that the systems can be easily maintained and upgraded as needed.

Programming adapters are essential tools for updating and configuring microcontroller units (MCUs) on PCB boards. They allow developers to load new firmware, troubleshoot issues, and make configuration changes without needing to remove the MCU from the board. The Si.Prog.Int adapter simplifies the process of maintaining and upgrading SiRcom’s systems, ensuring they remain up-to-date with the latest features and security enhancements.

Features and Benefits of Programming Adapters:

  • Ease of Use: Provides a simple backup process for updating firmware and configuring MCUs.
  • Efficiency: Allows for quick and easy troubleshooting and maintenance of systems.
  • Flexibility: Supports a range of programming tasks, from simple updates to complex configuration changes.
  • Seamless Integration: Designed to work seamlessly with any SyCon and GPIO16-10 boards, providing a reliable connection for programming tasks.
  • Enhanced Security: Ensures systems can be easily updated with the latest firmware enhancements.


SiRcom’s advanced PCB boards are at the forefront of modern siren system control, providing versatile, scalable, and reliable solutions for various applications. From small community alert systems to extensive networks covering large areas, SiRcom’s PCBs offer the flexibility and advanced features needed to ensure effective and reliable emergency alerts. By integrating these advanced boards with additional modules and sensors, organizations can build robust siren systems that safeguard communities and enhance public safety. Explore SiRcom’s range of PCBs to find the perfect solution for your siren system needs and elevate your emergency management capabilities.


Author: Micah Reedy / Marketing Specialist



SiRcom | An innovative turnkey mass notification systems and emergency warning solutions provider, founded in 1993 by a team of industry pioneers with decades upon decades of industry insights and technical know-how in sound acoustics, siren manufacturing and emergency warning software technologies.

SiRcom works firsthand with federal governments, armed forces, local cities, school districts, medical, industrial and sport complexes, to provide revolutionary emergency management and mass notification systems dedicated to mitigating risks, saving lives and protecting properties from threats of any nature such as wildfires, hurricanes, flash floods, tsunamis, tornados, pandemics, military conflicts, active shooter incidents, and a lot more. Since 1993, SiRcom has built an international support structure for worldwide clients.

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