NI GPIB-140A總線(xiàn)擴展器 GPIB總線(xiàn)擴展器 - GPIB-140A可將GPIB系統的線(xiàn)纜延長(cháng)一千米，而不會(huì )影響GPIB的完整性，也無(wú)需修改軟件。該配件使用緩沖傳輸技術(shù)，數據傳輸速率高達1.1 Mb/s (IEEE 488.1)或2.8 Mb/s (HS488)。GPIB-140A還可以將GPIB系統中GPIB設備的最大數量從15個(gè)增加到26個(gè)。
模塊從現場(chǎng)處理器接收電源，以運行其自身的5伏邏輯。外部
輸入設備需要24VDC電源。
發(fā)光二極管
單個(gè)LED（邏輯側），通過(guò)模塊頂部的透明部分可見(jiàn)，
指示每個(gè)輸入的開(kāi)/關(guān)狀態(tài)?，F場(chǎng)和背板通電時(shí)，PWR LED亮起存在。
主機接口NI GPIB-140A
該模塊的智能處理由總線(xiàn)接口單元或
系統。這包括配置輸入默認值和故障報告等功能。這個(gè)
模塊有16位（兩個(gè)字節）的離散輸入數據。需要一個(gè)總線(xiàn)接口單元來(lái)
將此輸入數據提供給主機和/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.
