描述
产品定位与功能
NI PXI-8331是美国国家仪器（NI）推出的PXI多机箱扩展接口模块，专为分布式测量系统设计，支持通过MXI-4技术实现多机箱级联或PC对PXI系统的透明控制。其核心功能包括：
高速数据桥接：在PXI chassis之间或PC与PXI chassis之间建立高速通信链路；
冗余与同步：支持星型或链式拓扑结构，保障多机箱系统的时间同步与数据完整性。
核心参数与性能
通信性能
-峰值带宽：132 MB/s（铜缆）；
-持续带宽：78 MB/s（光纤可达更高稳定性）；
-传输距离：铜缆最远10 m，光纤可达200 m。
硬件特性
-接口类型：光纤或铜缆（可选配置）；
-电源需求：+3.3 V/0.25 A，+5 V/1.5 A；
-物理尺寸：3U PXI模块，10.0×16.0 cm。
协议与兼容性
-支持标准：PXI硬件规范2.1，PCI规范2.2；
-兼容设备：NI PXI-1042机箱、PXI-8336光纤模块及其他MXI-4兼容设备。
技术特点
透明桥接架构
-采用PCI-to-PCI桥接技术，使远程PXI模块在软件层面表现为本地PCI设备，无需额外驱动开发。
工业级可靠性
-错误检测与重传：通过CRC校验确保数据传输完整性；
-电气隔离：光纤模式下实现PC与PXI系统的电气隔离，抗干扰能力显著提升。
灵活部署
-拓扑支持：
-星型结构：单主控机箱连接多个从机箱；
-链式扩展：多机箱串联（最多支持255个PCI总线节点）。
典型应用场景
大型测试系统集成
-半导体产线中多PXI机箱协同测试（如晶圆分选机信号采集）；
-飞机机载设备分布式监测（光纤长距离传输优势）。
高密度测量需求
-汽车碰撞测试系统（多通道数据同步采集）；
-电网自动化测试平台（冗余配置保障系统连续运行）。
Product Positioning and Functions
NI PXI-8331 is a PXI multi-chassis extension interface module launched by National Instruments(NI).It is specially designed for distributed measurement systems and supports the implementation of multi-chassis cascade or transparent control of PXI systems through MXI-4 technology.Its core functions include:
High-speed data bridge:establish a high-speed communication link between PXI chassis or between PC and PXI chassis;
Redundancy and synchronization:Supports star or chain topology to ensure time synchronization and data integrity of multi-chassis systems.
Core parameters and performance
Communication performance
-Peak bandwidth:132 MB/s(copper cable);
-Continuous bandwidth:78 MB/s(fiber can achieve higher stability);
-Transmission distance:The farthest copper cable is 10 m,and the optical fiber can reach 200 m.
Hardware features
-Interface type:fiber or copper cable(optional configuration);
-Power requirements:+3.3 V/0.25 A,+5 V/1.5 A;
-Physical dimensions:3U PXI module,10.0×16.0 cm.
Protocol and compatibility
-Support standards:PXI hardware specification 2.1,PCI specification 2.2;
-Compatible devices:NI PXI-1042 chassis,PXI-8336 fiber optic module and other MXI-4 compatible devices.
Technical Features
Transparent bridge architecture
-Adopt PCI-to-PCI bridging technology to enable remote PXI modules to behave as local PCI devices at the software level without additional driver development.
Industrial-grade reliability
-Error detection and retransmission:Ensure data transmission integrity through CRC verification;
-Electrical isolation:The electrical isolation between PC and PXI system is achieved in fiber optic mode,and the anti-interference ability is significantly improved.
Flexible deployment
-Topology support:
-Star structure:a single master chassis is connected to multiple slave chassis;
-Chain extension:Multi-chassis series connection(supports up to 255 PCI bus nodes).
Typical application scenarios
Large-scale test system integration
-Coordinated testing of multiple PXI chassis in semiconductor production lines(such as wafer sorter signal acquisition);
-Distributed monitoring of aircraft on-board equipment(advantage of fiber-optic long-distance transmission).
High density measurement requirements
-Automobile collision testing system(simultaneous acquisition of multi-channel data);
-Grid automation test platform(redundant configuration ensures continuous operation of the system).
