在串行通信時，要求通信雙方都采用一個標準接口，使不同的設備可以方便地連接起來進行通信。在設計通信接口時，一般都采用標準接口以提高其通用性。本系統(tǒng)中，上、下位機進行通信首先面臨的問題就是通信標準的選擇問題。
1、RS-232C接口標準
RS-232C接口標準（全稱EIA-RS-232C標準）是在1969年由美國電子工業(yè)聯(lián)合會（EIA，ElectronicIndustrialAssociate-RecommendedStandard-232C）與Bell公司、調(diào)制解調(diào)器廠家及計算機終端生產(chǎn)廠家共同開發(fā)的用于串行接口的通信協(xié)議。它最初是為遠程通信連接數(shù)據(jù)終端設備DTE（DataTerminalEquipment）和數(shù)據(jù)通信設備DCE（DataCommunicationEquipment）而制定的[46]。雖然這個標準的制定沒有考慮計算機系統(tǒng)的應用要求，但是廣泛的用于計算機與終端或外設之間的連接。
 
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KLA-Tencor65565021900C2，655-653877-00，65565263600，3X-11149，740-651221-00


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NIKON4S018-395-1WS8DRV 


RFGENERATORCABLE03-046420-04-BTR17101203


ORBOTECHMVC-FG，0355790B 


ADVANCEDENERGYSPARC-LE20DC ARC3152244-001C 


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RORZECORPORATIONRE117-121-003，R1105-001-003


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NIKON4S018-395-AWS8DRV 


KYOWAOPTICALEPI-2A+MEGALIGHT50+DC-700+XC-75+DL2201


HUGLEELECTRONICS，IONIZER411N1-2W/GUN


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AMATAPPLIEDMATERIALS0100-A0015REV:ANAP 0110-A0007


NIKON4S017-849-ELMDRV 


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