GPIB-140  |   扩展器   接收来自发射扩展器的串行或并行信号

　　描述： GPIB-140A，GPIB设备数量增加到26个，GPIB扩展器

　　NI GPIB-140A (部件号： 777997-01， 777997-02， 777997-03， 777997-04， 777997-05 和 777997-06) 是一款 GPIB 总线扩展器。该设备可轻松消除 IEEE 488 标准强制要求的电缆长度和设备负载相关限制。GPIB-140A 完全兼容 IEEE 488.1 和 IEEE 488.2 标准。根据 IEEE 488 标准，任何 GPIB 系统的总长度都不能超过 20 m。一对GPIB延长器可以达到1公里的总距离，无需任何修改，也不会影响用户GPIB系统的完整性。

　　这款GPIB延长器可以支持长达1公里的光缆。NI GPIB-140A 采用 缓冲 传输 技术， 使 该 型号 成为 目前 最 快 的 GPIB 总 线 扩展 器 之一。使用此型号，用户在 HS488 协议下运行时可以实现超过 2.8 MB 的速度。该GPIB扩展器可以毫不费力地部署，不需要额外的硬件。在典型场景中，计算机设备的一端连接到电缆延长器。在远端，GPIB仪器连接到类似的电缆延长器。然后，两个电缆延长器通过光纤电缆互连。

　　每 台 NI GPIB-140A 都 持续 监测 GPIB 活动， 并 将 GPIB 信号 转换 成 并行 或 串行 信号， 以便 传输 到 接收 扩展 器。接收扩展器接收来自发射扩展器的串行或并行信号，并将其转换为 IEEE 488 信号。NI GPIB-140A 无需对现有软件应用程序进行修改，因为它是软件透明的。

　　Description: GPIB-140A, the number of GPIB devices increased to 26, GPIB extenders

　　The NI GPIB-140A (part number: 777997-01, 777977-02, 777977-03, 777977-04, 777977-05 and 777977-06) is a GPIB bus extender. The device easily eliminates cable length and device load related limitations imposed by the IEEE 488 standard. The GPIB-140A is fully compatible with IEEE 488.1 and IEEE 488.2 standards. According to the IEEE 488 standard, the total length of any GPIB system cannot exceed 20 m. A pair of GPIB extenders can achieve a total distance of 1 km without any modification and without compromising the integrity of the user's GPIB system.

　　The GPIB extender can support up to 1 km of cable. The NI GPIB-140A uses buffered transmission technology, making this model one of the fastest GPIB bus extenders available today. With this model, users can achieve speeds of more than 2.8 MB when running under the HS488 protocol. The GPIB extender can be deployed effortlessly and requires no additional hardware. In a typical scenario, one end of a computer device is connected to a cable extender. At the far end, the GPIB instrument is connected to a similar cable extender. The two cable extenders are then interconnected via a fiber optic cable.

　　Each NI GPIB-140A continuously monitors GPIB activity and converts GPIB signals into parallel or serial signals for transmission to the receive extender. The receive extender receives a serial or parallel signal from the transmit extender and converts it into an IEEE 488 signal. The NI GPIB-140A does not require modifications to existing software applications because it is software-transparent.