Xycom XVME-428/1

The XVME-428/1 is an asynchronous serial communication module for the VME-bus from Xycom, and it belongs to the IASCM (Intelligent Asynchronous Serial Communication Module) series. It adopts the standard VME-C-2 specification and can be directly inserted into the backplane of a 21-slot VME-chassis. It provides a high-speed and reliable serial I/O interface, and is widely used in industrial automation, process control, data acquisition and monitoring, and other scenarios.

Main Technical Specifications

• Number of Channels: 8 independent RS-422/RS-485 serial channels (channel numbers 0-7), and each channel can be configured independently.
• Baud Rate: Supports a programmable range of 300 bps to 3 Mbps, with the commonly used 9600 bps as the default value.
• Data Bits/Stop Bits/Parity: 8 bits per character, 1 stop bit, and no parity (can be modified according to requirements).
• Power Supply: +5 V (powered by VME-bus), with a power consumption of approximately 2 W.
• Address Space: Occupies the VME short address space of 0×03800-0x038FF. The register mapping includes channel control, baud rate setting, data buffer, and more.
• Operating Temperature: 0 °C to +55 °C, meeting the requirements of industrial environments.
• Mechanical Dimensions: Standard VME-C-2 card size (6U height), which can be directly installed in a 21-slot VME-chassis.

Product Features

• Multi-Channel Parallel Operation: Provides 8 independent serial channels at one time, suitable for centralized management of multi-point sensors or actuators.
• Flexible Configuration: The baud rate, data bits, stop bits, and parity mode of each channel can be programmed via software, making it compatible with a variety of fieldbus protocols.
• High Speed and Reliability: Adopts RS-422/RS-485 drivers, which have strong anti-interference capabilities and support long-distance (> 100 m) transmission.
• Plug-and-Play: Complies with the VME-C-2 standard, enabling easy insertion and removal, and supports hot swapping (in supported systems).
• Rich Register Interface: Provides dual-port RAM for command/data interaction, and supports polling or interrupt methods to notify the host.
• Industrial-Grade Durability: Complies with certifications such as IEC 60730 and CE, and is suitable for harsh factory workshop environments.

Structure and Composition

• VME Interface Board: Responsible for interacting with the backplane in terms of electricity, clock, and address.
• Dual-Port RAM: Used for command block and data buffering between the host and the module.
• Serial Driver Chip: Each channel is equipped with an RS-422/RS-485 driver to achieve differential transmission.
• Control Logic: Implements functions such as channel selection, baud rate frequency division, and status monitoring through FPGA/ASIC.
• Power Management Module: Obtains +5 V from the VME bus and internally generates the required internal voltages.

Typical Application Areas

• Industrial Automation Control: Serial connection between PLC, DCS and on-site sensors/actuators.
• Process Monitoring: Remote data acquisition of instruments for temperature, pressure, flow, etc.
• Test and Measurement Systems: Multi-channel signal acquisition in laboratories or production lines.
• Communication Gateway: Serves as a bridge module from serial bus to Ethernet/fieldbus in VME systems.

Installation and Maintenance Points

• Installation: After inserting the XVME-428/1 into the VME-C-2 slot, confirm that the card backplane is in good contact with the chassis; check whether the power indicator is normal before powering on.
• Address Configuration: Set the base address of the card (default 0×03800) through VME configuration software when the system starts, to ensure no conflict with other VME cards.
• Channel Initialization: Use upper computer software or PLC programs to write channel parameters (baud rate, data bits, etc.) into the dual-port RAM, and then start the channel.
• Fault Diagnosis: The card is equipped with a status register, which can read information such as channel errors and buffer overflows; if necessary, real-time alarms can be obtained through the interrupt mechanism of the VME bus.
• Regular Inspection: In high-temperature or high-humidity environments, it is recommended to check the heat sink and connection pins of the card every 6 months for oxidation or looseness.
• Spare Parts Management: Keep the XVME-428/1 itself and the corresponding power adapters, VME backplane card holders in stock for quick replacement.

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