Honeywell Enraf CAN-OPTION-SSC 0390503 REW11

The Honeywell Enraf CAN-OPTION-SSC (Manufacturer Part Number: 0390503 REW11, Assembly Reference: 2558978-2) is a high-reliability fieldbus option module designed for integration within Honeywell Enraf SmartRadar FlexLine series level gauges, Tank Side Indicators (TSI), and associated marine/terminal inventory interfaces.

The CAN-OPTION-SSC serves as the isolated interface bridging the core processor architecture to distributed field networks. It executes physical-layer isolation, localized transient suppression, and hardware-arbitrated communication via controller area network (CAN) and proprietary synchronous/asynchronous serial channels (Enraf GPU, Bi-Phase Mark, Modbus RS-485, and HART secondary loops).

Each unit features conformal-coated industrial-grade multilayer surface-mount assemblies, localized DC/DC galvanic barrier circuitry, and surface-mount surge arrestors designed to divert induced transients caused by deck machinery switching, lightning strikes, or fluctuating marine switchboard supplies.

Technical Specifications

Compatible Host Instruments

• Honeywell Enraf SmartRadar FlexLine Series: Models including SmartRadar FlexLine 990 and SmartRadar FlexLine 992.
• Tank Side Displays & Interface Modules: Honeywell Enraf TSI 977, CIU 858 (Communication Interface Unit), and CIU 888.
• Radar Level Gauges Legacy Cross-Compatibility: Replaces option cards within specific configurations of Enraf Series 854 ATG / XTG and SmartRadar Pro terminal setups (verify backplane cage compatibility with serial prefix).

Part Number Cross-References

• Primary Part Number: 0390503 REW11
• Alternate Engineering/Assembly Code: 2558978-2 / 25589782
• Family Identifiers: CAN-OPTION-SSC, CAN-SSC-MOD, CAN-OPT-0390503
• Equivalent Legacy Revisions: 0390503 REW09, 0390503 REW10 (Drop-in backward compatible; REW11 contains upgraded surge suppression capacitors)

Frequently Asked Questions

Is the Honeywell Enraf 0390503 REW11 interchangeable with earlier revisions like REW09 or REW10?

Yes. The 0390503 REW11 is completely backward-compatible with older hardware revisions. Revision 11 features upgraded electrostatic discharge (ESD) components and enhanced surge suppression circuitry, but retains identical mounting footprints, edge-connector geometry, and terminal allocations.

Can the CAN-OPTION-SSC board handle both internal radar data and third-party temperature probes simultaneously?

The CAN-OPTION-SSC module manages the high-speed communications trunk. When installed alongside compatible temperature/water interface boards (such as the VITO temperature and water bottom probe board), it multiplexes and processes the data across the internal bus without requiring external converter hardware.

How do I troubleshoot a “Bus Offline” error after installing the board?

First, verify that line voltages between CAN_H and CAN_L sit at approximately 2.5 VDC in the recessive state and separate to ~3.5 V (High) and ~1.5 V (Low) during active transmission. Second, check that the onboard termination jumper is set correctly (only active on end-of-line units). Finally, ensure that the communication port settings on the host CIU or Entis system match the baud rate assigned to the gauge slot.

Does the board need software reprogramming upon installation?

No low-level firmware burning is required on the board itself. The CAN-OPTION-SSC is recognized as an active peripheral card by the host instrument backplane. Once slotted into the designated option slot, parameter addressing and telemetry configurations are pushed to it directly from the gauge processor or via the Enraf portable configuration tool.

What certifications apply to this board when installed in the instrument?

When housed within certified Honeywell Enraf SmartRadar FlexLine explosion-proof/flameproof enclosures, the complete assembly retains ATEX, IECEx, and Class I, Division 1 / Zone 1 intrinsic and flameproof safety certifications (Ex d, Ex ia/ib).