NI 186135F-31拓展器1 km，GPIB总线扩展器 - GPIB-140A可将GPIB系统的线缆延长一千米，而不会影响GPIB的完整性，也无需修改软件。该配件使用缓冲传输技术，数据传输速率高达1.1 Mb/s (IEEE 488.1)或2.8 Mb/s (HS488)。GPIB-140A还可以将GPIB系统中GPIB设备的最大数量从15个增加到26个
正或负输入
此模块的输入可以是正输入或负输入（所有16个输入必须相同
类型）。当开关闭合时，这两种类型的信号都会产生逻辑1（true）。选择
通过外部电源
连接至输入端和输入/输出接线板。
正极输入从输入设备接收电流，并向公共或负极提供电流
电源总线。输入设备连接在正极电源母线和输入端子之间。NI 186135F-31拓展器1 km
负输入为输入设备提供电流，并接受来自公共或
正极电源母线。输入设备连接在负极电源总线和输入之间
航空站
Positive or Negative Inputs
Inputs for this module can be either positive or negative inputs (all 16 inputs must be the same
type). Both types of signal produce a logic 1 (true) when the switch is closed. Selection of
positive or negative operation is made by the manner in which the external power supply is
connected to the inputs and to the I/O Terminal Block.
Positive inputs receive current from input devices and supply current to the common or negative
power bus. Input devices are connected between the positive power bus and the input terminals.
Negative inputs provide current to input devices and accept current from the common or
positive power bus. Input devices are connected between the negative power bus and the input
terminal.
