PXI-8423  |    具有即插即用兼容性  |  连接器

　　National Instruments PXI-8423/2 RS-485 接口

　　National Instruments PXI-8423/2 (部件号： 777737-02) 具有 64B FIFO、460.8 (kb/s) 传输速率和光隔离， 是 用于 PXI 的 RS-485 接口。它是一个异步接口，用于通过串行端口与仪器进行通信。此型号与 Microsoft 2000、NT、XP、Me 和 9x 具有即插即用兼容性。因此，它带来了自动配置的优势，可实现无忧安装。该设备可以很容易地从用户当前的应用程序(如Visual Basic，Excel Visual，C++等)安装为标准串行端口。

　　此型号提供 2 端口和 4 端口配置。在 2 端口配置 DB-9 中，公连接器与 RS232 和 RS485 连接器的标准引脚排列相结合。NI PXI-8423 的 4 端口 版本 配备 模块化 的 10 位 电话 插孔。但是，这些电话插孔可以转换为 DB-25 或 DB-9 公连接器，使用可单独购买的转换器电缆。

　　NI PXI-8423/2 提供 了 高级 功能， 如 通用 PCI、高达 2 Mb/s 的 灵活 波特率 以及 多 处理器 和 超 线程 兼容性。使用此模型，用户将能够与以 0.01% 以内的标准波特率运行的设备进行通信。此外，它还允许与在 57 b/s 至 2 Mb/s 范围内以非标准波特率运行的设备进行通信。为了提高效率和速度，PXI-8423/2的超线程和多处理器兼容性使用户能够利用最新的PC技术。该接口器件提供增强的串行驱动器，可实现轻松配置、高级性能和访问所有高级收发器控制模式。

　　National Instruments PXI-8423/2 RS-485 interface

　　The National Instruments PXI-8423/2 (Part number: 777737-02) features a 64B FIFO, 460.8 (kb/s) transfer rate and optical isolation, and is an RS-485 interface for PXI. It is an asynchronous interface for communicating with instruments via serial ports. This model has plug-and-play compatibility with Microsoft 2000, NT, XP, Me, and 9x. Therefore, it brings the advantage of automatic configuration for worry-free installation. The device can be easily installed from the user's current application (such as Visual Basic, Excel Visual, C++, etc.) as a standard serial port.

　　This model is available in 2-port and 4-port configurations. In the 2-port configuration DB-9, the male connector is combined with the standard pin arrangement of the RS232 and RS485 connectors. The 4-port version of the NI PXI-8423 is equipped with a modular 10-bit telephone jack. However, these phone jacks can be converted to DB-25 or DB-9 male connectors using converter cables that can be purchased separately.

　　The NI PXI-8423/2 offers advanced features such as universal PCI, flexible baud rates up to 2 Mb/s, and multi-processor and hyper-threading compatibility. Using this model, users will be able to communicate with devices operating at standard baud rates within 0.01%. In addition, it allows communication with devices operating at non-standard baud rates in the range of 57 b/s to 2 Mb/s. To increase efficiency and speed, the PXI-8423/2's hyper-threading and multiprocessor compatibility enables users to take advantage of the latest PC technology. This interface device provides enhanced serial drivers for easy configuration, advanced performance and access to all advanced transceiver control modes.