XYCOM XVME-491 Quad Module RS-422/485 I/o

( Brand: Xycom ), ( Manufacturer Part Number: XVME-491 ), ( Part Type: Module )

Review XYCOM Quad Rs-422/485 Serial I/o Module

The **XYCOM XVME-491 Quad RS-422/485 I/O Module** is a high-performance, versatile expansion card designed to seamlessly integrate robust serial communication capabilities into industrial and embedded systems utilizing the XMC (Xtreme Modular Computing) or VME (Versa Module Europa) bus architecture. Engineered for applications demanding reliable, high-speed data exchange, this module features four fully isolated, bidirectional RS-422/485 ports, each configurable to operate in either half-duplex or full-duplex modes, making it an ideal solution for connecting to a wide range of industrial sensors, actuators, PLCs, or field devices. Built with precision and durability in mind, the XVME-491 incorporates high-quality differential drivers and receivers that comply with strict communication standards, ensuring robust signal integrity even in harsh environments characterized by electrical noise, long cable runs, or extreme temperature fluctuations. The module s isolated design not only enhances safety by preventing ground loops and voltage spikes from compromising the host system but also allows for flexible wiring configurations, accommodating a variety of voltage levels and signal types without risking cross-contamination between ports. With support for baud rates up to **115,200 bps**, the XVME-491 delivers efficient data transfer while maintaining low latency, making it suitable for real-time control systems, SCADA applications, or any scenario requiring synchronized communication between multiple devices. Its compact yet rugged form factor, combined with a user-friendly interface, simplifies integration into existing VME or XMC-based systems, whether in a laboratory, industrial automation setup, or high-reliability embedded platform. Additionally, the module s software-driven configuration options accessible via intuitive driver APIs or configuration utilities enable engineers to fine-tune communication parameters, such as parity, stop bits, and flow control, ensuring optimal performance tailored to specific application requirements. Whether deployed in a mission-critical manufacturing environment, a research facility, or a defense-related system, the XYCOM XVME-491 stands as a dependable bridge between high-speed computing platforms and the diverse serial devices that power modern industrial and scientific workflows.

### **Pros and Cons of the XYCOM XVME-491 Quad RS-422/485 I/O Module**

#### **Pros**

1. **Versatile Communication Interface** Supports both RS-422 and RS-485, making it compatible with a wide range of industrial devices, sensors, and actuators. This flexibility ensures seamless integration into existing or new systems.

2. **High-Speed Data Transfer** RS-422/485 provides robust, long-distance communication (up to 1.2 km for RS-485 in ideal conditions), reducing the need for signal repeaters or intermediate converters.

3. **Isolated Inputs/Outputs** The module likely includes galvanic isolation for each channel, protecting against voltage spikes, noise, and ground loops, which is critical in harsh industrial environments.

4. **Compact and Modular Design** As part of the XVME series, it fits into standard VMEbus or VME64x backplanes, making it suitable for embedded systems, test equipment, and automation applications where space is limited.

5. **Reliable and Industrial-Grade** XYCOM modules are known for durability, operating reliably in temperature ranges typical of industrial settings (often -40 C to 85 C).

6. **Easy Integration with VME Systems** If your application already uses a VME-based architecture, this module integrates smoothly without requiring additional hardware or complex programming.

7. **Support for Multi-Drop Networks** RS-485 s multi-drop capability allows multiple devices to share a single communication line, simplifying wiring and reducing costs in distributed systems.

8. **Software Support and Documentation** XYCOM provides development tools, drivers, and documentation, which can expedite implementation and troubleshooting.

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#### **Cons**

1. **Limited to VME Bus** If your system does not use VME or VME64x, this module is incompatible, requiring additional adapters or a complete redesign of the architecture.

2. **Potential Latency in VME Systems** VME buses can introduce latency compared to modern PCIe or Ethernet-based solutions, which may be a bottleneck in high-speed data acquisition or real-time control applications.

3. **Cost** As an industrial-grade module, the XVME-491 may be more expensive than off-the-shelf RS-422/485 converters or USB-to-serial adapters, depending on the application scale.

4. **Learning Curve for VME Development** If your team lacks experience with VME programming or hardware integration, setup and debugging could require additional training or external support.

5. **No Built-in Protocol Support** The module provides raw serial communication; higher-level protocols (e.g., Modbus, Profibus) must be implemented in software, adding complexity to the application layer.

6. **Limited Channel Count** With only four channels, this module may not suffice for applications requiring extensive I/O expansion. Larger systems might need multiple units or a different module with more ports.

7. **Deprecation Risk** VME is an older standard, and while still used in niche applications, it may lack long-term support or updates compared to newer bus standards like PCIe or Ethernet.

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### **Ending Conclusion**

The **XYCOM XVME-491 Quad RS-422/485 I/O Module** is a robust and flexible solution for applications requiring reliable serial communication within a VME-based system. Its strengths lie in its isolation, long-distance communication capabilities, and compatibility with industrial environments. However, its limitations such as VME-specific constraints, potential latency, and higher cost may make it less ideal for modern, high-speed, or non-VME applications.

### **Recommendation**

- Your system is VME-based and requires isolated RS-422/485 communication.

- You need a compact, industrial-grade module for long-distance or noisy environments.

- Your application benefits from multi-drop RS-485 connectivity without complex protocol overhead.

- Your system does not use VME, and you could opt for a PCIe, USB, or Ethernet-based RS-422/485 converter (e.g., from Advantech, National Instruments, or FTDI).

- You require higher channel counts or more advanced features (e.g., built-in Modbus support).

- Cost is a critical factor, and a simpler, less expensive solution (e.g., a USB-to-RS-485 adapter) would suffice.

For most modern applications, evaluating whether VME is still the optimal bus architecture is essential. If VME remains necessary, the XVME-491 is a solid choice; otherwise, newer bus standards may offer better scalability and performance.

Details:

Part Number: 70491-001. Fast and hassle-free. Hours / Location. Are not included with this equipment unless pictured and/or listed in the above.

Xycom XVME-491 Quad RS-422/485 Serial I/O Module:: This Acreage / Embedded Module is new from surplus stock.

part #: xvme491 prices

• $995.00-$1995.00

specifications sensoindustria:

• brand: Xycom
• mpn: Xvme-491
• part type: Module

payments sensoindustria:

• credit card: Visa
• wallet: Paypal
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offer sensoindustria:

• sold: 0
• options: Ship-to-home
• started: June 3, 2026
• availability: In Stock
• quantity: 12

shipping sensoindustria:

• cost: $33.32
• type: Calculated
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• service: FedEx Ground / FedEx Home Delivery, FedEx Standard Overnight, FedEx Ground Economy
• class: Standard, One-day, Economy

seller sensoindustria:

• city: Champaign, Illinois
• # reviews: 17975
• rating: 99.8%

general sensoindustria:

• condition: Used
• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules

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• paid by: Buyer
• method: Money back
• policy: Returns Accepted
• time: 30 Days

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