Motorola MVME204-2通讯模块

1.产 品 资 料 介 绍：

Motorola MVME204-2 VMEbus 通讯模块解析

一、核心技术特性

1. 多类型通信接口：覆盖多样化连接需求

• 串行通信接口：
  支持 RS-232/RS-422/RS-485 三种模式按需配置，典型提供 2-4 路独立串行通道，适配不同传输距离与节点数需求：
  • RS-232 模式：用于近距离点对点通信（如连接本地调试终端、人机界面 HMI），传输距离≤15 米，波特率最高 115200 bps；
  • RS-422 模式：支持差分信号传输，抗干扰能力强，传输距离≤1200 米，可实现 1 主多从（最多 10 个从节点），适配车间分布式传感器、执行器的远距离数据交互；
  • RS-485 模式：在 RS-422 基础上支持 “总线型拓扑”，可连接 32 个节点，传输距离≤1200 米，适合电力变电站、大型生产线等多设备集中通信场景；
• 并行通信接口：
  集成 1 路 8 位 / 16 位并行接口，支持双向数据传输，峰值传输速率可达 1 Mbps（匹配参数表速率上限），主要用于高速数据交互场景（如连接实验室数据采集卡、工业打印机，实现批量测试数据快速上传或日志输出）。

2. 高速数据传输：保障实时通信需求

• DMA 直接内存访问：模块集成独立 DMA 控制器，支持与 MVME 系列 CPU 模块的内存直接交互，无需 CPU 参与数据搬运，大幅降低 CPU 占用率 —— 例如在电力调度场景中，可通过 DMA 将变电站采集的 1000 条电网参数数据直接写入 CPU 内存，传输延迟≤100μs，避免 CPU 轮询导致的通信滞后；

Motorola MVME204-2通讯模块 英文资料：

Analysis of Motorola MVME204-2 VMEbus Communication Module

The Motorola MVME204-2 is an industrial grade communication module exclusive to the MVME200 series, designed based on the VMEbus architecture. Its core positioning is as a "multi-channel data exchange hub for embedded systems" - providing stable external data communication capabilities for MVME series CPU modules (such as the MVME2100 series) through flexible serial/parallel interface configuration, DMA high-speed transmission, and industrial grade anti-interference design. It is suitable for industrial automation, power dispatching, distributed control, and other scenarios that require "communication reliability+real-time". It is a key component for building data links between VME bus systems and external devices.

1、 Core technical characteristics

1. Multi type communication interfaces: covering diverse connection requirements

The core advantage of MVME204-2 lies in its "interface flexibility", which allows for the configuration of different types of communication channels according to different scenarios, meeting the diverse connectivity needs of industrial sites

Serial communication interface:

It supports the configuration of RS-232/RS-422/RS-485 modes as required, and typically provides 2-4 independent serial channels to adapt to different transmission distances and node number requirements:

RS-232 mode: used for close range point-to-point communication (such as connecting local debugging terminals, human-machine interface HMI), transmission distance ≤ 15 meters, maximum baud rate of 115200 bps;

RS-422 mode: supports differential signal transmission, strong anti-interference ability, transmission distance ≤ 1200 meters, can achieve 1 master and multiple slaves (up to 10 slave nodes), suitable for long-distance data exchange of distributed sensors and actuators in the workshop;

RS-485 mode: supports "bus topology" based on RS-422, can connect 32 nodes, transmission distance ≤ 1200 meters, suitable for centralized communication scenarios of multiple devices such as power substations and large production lines;

Parallel communication interface:

Integrated with one 8-bit/16 bit parallel interface, supporting bidirectional data transmission, with a peak transmission rate of up to 1 Mbps (matching the upper limit of the parameter table rate), mainly used in high-speed data interaction scenarios (such as connecting laboratory data acquisition cards, industrial printers, and achieving fast upload or log output of batch test data).

2. High speed data transmission: ensuring real-time communication needs

DMA direct memory access: The module integrates an independent DMA controller and supports direct memory interaction with MVME series CPU modules, without the need for CPU involvement in data transfer, significantly reducing CPU usage. For example, in power dispatch scenarios, 1000 grid parameter data collected from substations can be directly written into CPU memory through DMA, with a transmission delay of ≤ 100 μ s, avoiding communication lag caused by CPU polling;

 Motorola MVME204-2通讯模块 产      品      展      示      

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The content is from Ruichang Mingsheng Automation Equipment Co., LTD

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