Honeywell Enraf S0690921 communication board

**Technical Parameters of Honeywell Enraf S0690921 Communication Board**

**Overview:**  

The Honeywell Enraf S0690921 is a dedicated communication interface board designed for integration within Enraf level measurement and inventory management systems. It serves as a critical component for enabling data exchange between field instruments (such as servo gauges, radar gauges, or tank thermometers) and higher-level control systems, host computers, or terminal servers.

**Key Specifications:**

*   **Primary Function:** Provides serial communication capabilities, typically for real-time transmission of tank inventory data, level, temperature, volume, and alarm statuses.

*   **Communication Protocols:** Commonly supports industry-standard protocols such as Enraf-BNP (a proprietary protocol), Modbus RTU (RS-485/RS-232), or potentially other fieldbus interfaces depending on configuration. Specific protocol compatibility is determined by the firmware and application.

*   **Physical Interfaces:** Features electrical connections for serial communication ports (e.g., RS-485, RS-232) via terminal blocks or connectors. May include multiple isolated channels.

*   **Power Supply:** Typically operates on a low-voltage DC supply as specified for the parent system or enclosure (e.g., 24 VDC). Exact requirements are defined by the host device's technical documentation.

*   **Operating Environment:** Designed for installation in controlled industrial environments, often within gauge enclosures, junction boxes, or system cabinets. Specific temperature, humidity, and EMI ratings conform to the standards of the host system.

*   **Compatibility:** Intended for use with specific Honeywell Enraf tank gauging systems and instruments. Correct integration requires verification against the system model and software version.

*   **Certifications:** Complies with relevant regional and industrial standards for electromagnetic compatibility (EMC) and safety, as applicable to the complete system assembly.

**Functional Description:**

The S0690921 board acts as the communication hub within its designated system. It translates data from the field instrument's internal processing unit into standardized serial messages for upstream devices. Key functionalities include protocol handling, data packet formatting, electrical signal conversion, and network addressing. It enables remote monitoring, configuration, and data logging, forming an essential link in automated tank farm management and inventory control solutions.

**Typical Application:**

This board is primarily deployed in terminals, refineries, chemical plants, and bulk storage facilities for accurate and reliable inventory management of liquids in storage tanks. It is integrated into systems requiring seamless data integration with Distributed