NI GPIB-140A總線擴(kuò)展器 GPIB總線擴(kuò)展器 - GPIB-140A可將GPIB系統(tǒng)的線纜延長一千米，而不會影響GPIB的完整性，也無需修改軟件。該配件使用緩沖傳輸技術(shù)，數(shù)據(jù)傳輸速率高達(dá)1.1 Mb/s (IEEE 488.1)或2.8 Mb/s (HS488)。GPIB-140A還可以將GPIB系統(tǒng)中GPIB設(shè)備的最大數(shù)量從15個增加到26個。
模塊從現(xiàn)場處理器接收電源，以運(yùn)行其自身的5伏邏輯。外部
輸入設(shè)備需要24VDC電源。
發(fā)光二極管
單個LED（邏輯側(cè)），通過模塊頂部的透明部分可見，
指示每個輸入的開/關(guān)狀態(tài)?，F(xiàn)場和背板通電時，PWR LED亮起存在。
主機(jī)接口NI GPIB-140A
該模塊的智能處理由總線接口單元或
系統(tǒng)。這包括配置輸入默認(rèn)值和故障報告等功能。這個
模塊有16位（兩個字節(jié)）的離散輸入數(shù)據(jù)。需要一個總線接口單元來
將此輸入數(shù)據(jù)提供給主機(jī)和/或本地處理器。
The module receives power from the Field Processor to run its own 5–volt logic. An external
24VDC supply is needed to power the input devices.
LEDs
Individual LEDs (logic side), visible through the transparent portion of the module top,
indicate the on/off status of each input. The PWR LED is on when field and backplane power
are present.
Host Interface
Intelligent processing for this module is performed by the Bus Interface Unit or elsewhere in
the system. This includes configuring features such as input defaults and fault reporting. The
module has 16 bits (two bytes) of discrete input data. A Bus Interface Unit is required to
provide this input data to the host and/or local processor.
