ALR111-S50 Dual-Port RS-232C Communication Module (Industrial-Grade Serial Interface)

The ALR111-S50 represents a proven serial communication solution for process automation environments demanding reliable point-to-point data exchange. This industrial-grade module delivers dual independent RS-232C ports, enabling simultaneous connectivity between distributed control systems, legacy instrumentation, and supervisory workstations. Engineered for Yokogawa CENTUM architectures and compatible with third-party controllers, the ALR111-S50 bridges modern SCADA platforms with established field devices through standardized serial protocols.

Process industries face persistent challenges integrating legacy equipment into contemporary control networks. The ALR111-S50 addresses this gap by providing electrically isolated serial channels that resist industrial noise while maintaining backward compatibility with existing RS-232C devices. Target users include automation engineers retrofitting aging DCS installations, system integrators expanding multi-vendor control networks, and plant operators requiring redundant communication paths for mission-critical data acquisition.

Key advantages include hot-swappable architecture for zero-downtime maintenance, compact DIN-rail mounting that conserves panel real estate, and configurable baud rates supporting diverse device requirements. The module's dual-port design eliminates the need for external serial multiplexers, reducing system complexity and potential failure points in harsh industrial environments.

Core Capabilities & Technical Value

→ Dual Independent RS-232C Ports
Two electrically isolated serial channels enable simultaneous connections to HMI panels, barcode scanners, or data loggers without port contention. Each channel operates independently at configurable baud rates up to 19.2 kbps, supporting asynchronous data transmission with selectable parity and stop-bit configurations.

✓ Electrical Isolation & Noise Immunity
Built-in galvanic isolation protects connected equipment from ground loops and electromagnetic interference common in motor control centers and high-voltage switchgear environments. This isolation maintains signal integrity across distances up to 15 meters without signal degradation.

• Hot-Swappable Design
Field-replaceable architecture allows module extraction and insertion during live system operation, eliminating costly process shutdowns for routine maintenance. Automatic configuration restoration ensures seamless service continuity after module replacement.

1. Compact Form Factor
Standard DIN-rail mounting with 25mm width occupies minimal panel space compared to legacy serial interface cards. Panel-mount adapters available for retrofit installations in existing enclosures.

2. Wide Operating Temperature Range
Rated for continuous operation from 0°C to 55°C (32°F to 131°F), suitable for non-climate-controlled equipment rooms and semi-outdoor control cabinets. Low power consumption (typically <3W) reduces thermal load in densely populated panels.

3. Protocol Flexibility
Supports standard serial protocols including Modbus RTU, ASCII, and proprietary device protocols through configurable communication parameters. Software-selectable handshaking modes (RTS/CTS, XON/XOFF) accommodate diverse device requirements.

Industrial Application Scenarios

Chemical Processing & Refining
Connect legacy analyzers and chromatographs to modern DCS platforms without replacing functional instrumentation. The ALR111-S50 enables real-time composition data transfer from laboratory equipment to process historians, supporting regulatory compliance and quality assurance workflows. Dual ports allow simultaneous connections to primary and backup data acquisition systems.

Power Generation & Utilities
Integrate protective relay panels and metering equipment into SCADA networks for centralized monitoring. Serial communication links provide critical alarm status and electrical parameter data to operator workstations, while isolated ports prevent ground-fault propagation between high-voltage and control circuits.

Pharmaceutical Manufacturing
Establish validated communication paths between batch controllers and electronic batch record systems. The module's deterministic data transmission supports 21 CFR Part 11 compliance requirements, while hot-swap capability maintains system availability during qualification activities and routine calibration.

Water & Wastewater Treatment
Link remote pump stations and treatment skids to central control rooms via serial telemetry. The ALR111-S50's noise immunity ensures reliable data exchange in electrically harsh environments with variable frequency drives and high-current switching equipment.

Food & Beverage Production
Interface barcode scanners, label printers, and weighing systems with production line controllers for traceability and inventory management. Dual ports support simultaneous connections to quality management databases and manufacturing execution systems.

Technical Parameters & Selection Criteria

Selection Guidelines: Choose the ALR111-S50 when your application requires dual simultaneous serial connections or redundant communication paths. For single-port requirements, consider the standard ALR111 model. Verify that connected devices support RS-232C voltage levels (±3V to ±15V) and maximum cable length does not exceed 15 meters. For longer distances or multi-drop configurations, evaluate RS-485 interface modules instead.

Extended Integration Capabilities

CENTUM VP/CS 3000 Integration
Native support for Yokogawa's distributed control platforms enables drag-and-drop configuration through engineering workstations. Pre-built function blocks simplify serial device integration without custom programming.

Third-Party Controller Compatibility
Standard RS-232C pinout ensures interoperability with Allen-Bradley, Siemens, Schneider Electric, and other major PLC brands. Generic serial driver templates available for common SCADA packages including Wonderware, iFIX, and Ignition.

Protocol Conversion Options
When paired with external protocol gateways, the ALR111-S50 enables Modbus RTU to Modbus TCP conversion, ASCII to OPC DA bridging, and proprietary protocol translation for specialized instrumentation.

Customization Services
Factory configuration services available for pre-programmed baud rates, parity settings, and connector pinouts matching specific customer requirements. Custom cable assemblies and panel-mount brackets can be supplied for turnkey installations.

Delivery Timeline & Service Commitments

Standard Lead Time: 3-5 business days for in-stock units; express shipping available to major industrial centers across North America, Europe, and Asia-Pacific regions.

Custom Configuration: 7-10 business days for factory-programmed modules with customer-specific parameter sets and testing documentation.

Warranty Coverage: 12-month manufacturer warranty covering defects in materials and workmanship. Extended warranty programs available for critical process applications.

Technical Support: Lifetime application engineering assistance via email and phone. Remote diagnostic support for troubleshooting communication issues and parameter optimization.

Documentation Package: Each module ships with installation manual, wiring diagrams, configuration software (where applicable), and compliance certificates (CE, UL, RoHS). CAD drawings and 3D models available for panel design integration.

Frequently Asked Questions

What is the maximum cable length supported by the ALR111-S50 RS-232C interface?
The module supports cable runs up to 15 meters (50 feet) using standard shielded twisted-pair cable. For longer distances, consider RS-485 interface modules or fiber-optic converters to maintain signal integrity.

Can both serial ports operate at different baud rates simultaneously?
Yes, each port features independent configuration registers allowing different baud rates, parity settings, and data formats. Port 1 can operate at 9600 bps while Port 2 runs at 19200 bps without interference.

How much power does the ALR111-S50 consume during typical operation?
Typical power consumption ranges from 2.5W to 3W depending on communication activity. The module draws power from the DCS backplane or external 24V DC supply, with built-in reverse polarity protection.

What installation clearances are required for proper ventilation?
Maintain minimum 10mm spacing above and below the module when mounted on DIN rail. For panel-mount installations, ensure 50mm clearance behind the module for cable routing and heat dissipation.

Does the module support remote monitoring and diagnostics?
When integrated with Yokogawa CENTUM systems, the ALR111-S50 provides real-time status monitoring including communication error counters, port activity indicators, and diagnostic alarms accessible through operator workstations.

Is the ALR111-S50 compatible with legacy Yokogawa μXL systems?
Yes, the module maintains backward compatibility with μXL distributed control systems through standard serial interface protocols. Consult factory application engineers for specific integration requirements and configuration parameters.

Request Technical Consultation

Our automation specialists are ready to assist with application-specific questions, system integration planning, and configuration recommendations. Contact our team to discuss your serial communication requirements, request detailed datasheets, or obtain project quotations. We provide complimentary pre-sales engineering support to ensure optimal product selection for your control system architecture.

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