Acromag PMC482 是一款由美国 Acromag 公司生产的高性能计数器/定时器模块，属于其嵌入式 I/O 产品线中的 PMC（PCI Mezzanine Card）系列，广泛应用于工业自动化、数据采集和实时控制领域。
一、核心功能与技术特性
模块类型：PMC482 为 48 通道 TTL 电平数字输入/输出模块，支持高精度计数与定时功能，适用于需要多通道数字信号处理的场景。
通道配置：
提供 48 路独立可编程的 TTL 电平数字 I/O 通道；
每个通道可单独配置为输入或输出模式，灵活性强。
计数器/定时器功能：
集成多个 32 位硬件计数器，支持频率、周期、脉冲宽度、事件计数等多种测量模式；
支持编码器接口（如正交编码器），可用于位置与速度反馈控制。
总线接口：符合 PMC 标准（IEEE P1386），可直接插接于支持 PMC 夹层卡的载板，如 PCI、PCIe、VME 或 CompactPCI 载卡，适用于多种嵌入式系统架构。
工作环境：
工业级设计，适应宽温、高湿、强电磁干扰等恶劣现场环境；
支持 -40°C 至 +85°C 扩展温度范围版本（如 PMC482E）。
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