美國(guó)SCSI交換（switching）是按照通信兩端傳輸信息的需要，用人工或設(shè)備自動(dòng)完成的方法，把要傳輸?shù)男畔⑺偷椒弦蟮南鄳?yīng)路由上。根據(jù)工作位置的不同，SCSI可以分為廣域網(wǎng)交換機(jī)和局域網(wǎng)交換機(jī)。SCSI廣域的交換機(jī)（switch）就是一種在通信系統(tǒng)中完成信息交換功能的設(shè)備。在計(jì)算機(jī)網(wǎng)絡(luò)系統(tǒng)中，交換概念的提出改進(jìn)了共享工作模式。而HUB集線器就是一種共享設(shè)備，HUB本身不能識(shí)別目的地址，當(dāng)同一局域網(wǎng)內(nèi)的A主機(jī)給B主機(jī)傳輸數(shù)據(jù)時(shí)，數(shù)據(jù)包在以HUB為架構(gòu)的網(wǎng)絡(luò)上是以廣播方式傳輸?shù)?，由每一臺(tái)終端通過(guò)驗(yàn)證數(shù)據(jù)包頭的地址信息來(lái)確定是否接收。也就是說(shuō)，在這種工作方式下，同一時(shí)刻網(wǎng)絡(luò)上只能傳輸一組數(shù)據(jù)幀的通訊，如果發(fā)生碰撞還得重試。這種方式就是共享網(wǎng)絡(luò)帶寬。

美國(guó)SCSI是Small Computer System Interface（小型計(jì)算機(jī)系統(tǒng)接口）的縮寫(xiě)，使用50針接口，外觀和普通硬盤(pán)接口有些相似。SCSI硬盤(pán)和普通IDE硬盤(pán)相比有很多優(yōu)點(diǎn)：接口速度快，并且由于主要用于服務(wù)器，因此硬盤(pán)本身的性能也比較高，硬盤(pán)轉(zhuǎn)速快，緩存容量大，CPU占用率低，擴(kuò)展性遠(yuǎn)優(yōu)于IDE硬盤(pán)，并且支持熱插拔

TRAFAG傳感器、TRAFAG壓力傳感器代表型號(hào)： 8891.80.3317.0100001934、8891.85.3315.0100001934、8891.77.3317.0100001934、873100663HT41205072……
Trafag pressure transmitter ECE/ECT:TRAFAG pressure transmitter ECE/ECT is now more precise due to both a newly developed calibration procedure and the Trafag in-house developed ASIC: the tighter accuracy band enables the absolute and relative pressure measurement from 0,6 to 40 bar at an accuracy NLH of 0,2% (0,2 to 0,4 bar at an accuracy of 0,3%) or from 1 to 400 bar at an accuracy of 0,5% respectively. 
Owing to the sensor technology “thick film on ceramics” the innovative pressure transmitter ECE/ECT is suitable for various media with years of endurance. The pressure transmitter ECE/ECT has EMC-protection according to IEC 6100. The attractive price-performance ratio, the modular construction, various process connections and output signals as well as high resistance against vibration make the pressure transmitter ECE/ECT the market leader: Highly demanding applications in the industrial sector such as water treatment, hydraulics or machine tools are possible with the cost-effective ECE/ECT, which replace the hitherto offered ECOS/ECOAA.