校驗和在信息幀的尾部用來判斷傳輸的正確與否，和校驗碼的計算方法是將命令碼到ETX之間的所有字符的ASCⅡ碼（十六進制數）相加，取所得和的最低2位數，在后面的通信程序設計里面還會提到。進行差錯檢驗的方法很多，常用的有奇偶校驗碼，水平垂直冗余校驗LRC，目前廣泛使用的是CRC校驗碼，它能查處99%以上18位或更長的突出錯誤，而在計算機與PLC點對點的短距離通訊時，出錯的幾率較小，因而采用校驗和法，基本能滿足要求。 
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AMPHENOLMS3101A18-8SW 


FUJIELECTRICAR22F0R-11Y 


TURCKRKC4.4T-4-RSC4.4T/S622EUROFASTCORDSETU5194


ALLENBRADLEY800MR-A9 SER.AWHITE，W/800M-XASER.B 


HUMPHREYCS5TA-HP 


ALLENBRADLEY800T-B2PUSHBUTTON800TB2SER.B


APPLETONUNILET1/2"LBFORM35ELBOWENCLOSURES4.5CUIN


NIBALCO200024-5-506PUSHBUTTONWHITECAP，M2010B


HONEYWELLMICROSWITCHBA-2RVT 


SQUARED9001-DA20CONTACTBLOCK2NOFOR 


ALLENBRADLEY1492EBM4 


BRYANTHUBBELL71520NCLOCKINGCONNECTOR20A250VAC3POLE4-WIRENEMAL15-20


NIBBANNERPBATPOWERBLOCK16386


SICK2-009-4776PINSQUARE 


PHOENIXCONTACTIBIL24DI4TERMINALBLOCKNO:2726214ID:190HW/FW04


TELEMECANIQUEZB2BV033PILOTLIGHTLENSGREENNEON25275


ALLENBRADLEY800T-T2MB21 


MENCOMFL21-FRAME 


HONEYWELLMICROSWITCH3MN1 


ALLENBRADLEY800E-AMRGSER.A 


NIBSQUARED9007MA-12LEVERARM1-1/2"LONG3/4DIAX5/8WIDESTEELROLLER86593


NIBC3CONTROLSW22IS2-IHW-FM24LW-10SELECTORSWITCH2-POS.


ALLENBRADLEY889N-F4AF-12F 


SENTROL1076SWITCHES


SIEMENS3SX3228UNIVERSALRADIUSACTUATORFOR3SE32 


KRONES1-018-32-033-0 


ALCOSWITCHRM0102 


ALLENBRADLEY889D-F4AC-2DC 


SCHNEIDERELECTRICZB4BW563 


LUMBERGRKW30-638/12FT 


ALLENBRADLEY800T-ASER.T，TYPE4，13BLACK 


IDIINTERCONNECTDEVICES10030-001-922，S-4-A-7-GS/C 


CUTLERHAMMER10250T-51 


NUMATICSRC08SF0M040150 


ALLENBRADLEY800FP-LF5 


WOODHEADBRADHARRISON40903600VOLT10AMPS 


AMPHENOL97-3057-20 


TPCWIRE&CABLE65402AC4POLEMALETREX-ONICS 


NIBALLENBRADLEY800EM-LSM35 


ELASTIMOLD20MA-FMS-JS 


NIBAMPINC2-329445-1 


SQUARED9013FSG-5SER.B 


ALLENBRADLEY1492-NM36END 


CUTLERHAMMERE30KC119 


SMCVVQ4000-50B-N7FITTINGS1/4"


CLEVELANDMOTIONCONTROLLID2-250LUG250MCM-6


ALLENBRADLEY1492-W4TERMINALBLOCK4MM22-12AWG800VGRAY


GENERIC2500-CBL-07LASER 


























WEIDMULLEREK4TERMINALBLOCKS4MMWIDTHGREEN/YELLOW


ALLENBRADLEY800T-P16PILOTLIGHTSER.NW/REDLENS 


SQUAREDPUSHBUTTONCOVERS9001-KXAR3，9001-KXAL3


ILSCOCT-6BLUE6STRSHORTBARREL 


ALLENBRADLEY800T-P16WPILOTLIGHTXFMR120V 


THOMAS&BETTSOCAL3/4"x6"PVCCOATED 


MICROSWITCHLSZ52C 


HUBBELLSHC1035CRCORDCONNECTORSMALE3/4INNPT


NIBALLENBRADLEY800T-XD3 


AMPHENOLMS3057-6ACIRCULARCABLECLAMP 


FEDEGARI6CLAMPSB12712


ALLENBRADLEY800T-X609 


AUGATALCOSWITCHM6402-0 


ALLENBRADLEY800EP-PL3GREEN 


ALLENBRADLEY800A-CPUSHBUTTON 


SELECTASS1103-BG 


ALLENBRADLEY802T-W1A 


HONEYWELL5MP1-1MICRO 


RFI-RFW-11500-24CABLEASSEMBLY22.000LGCOAXRFRG58F/RTU，KIMRAYWKA7349


ALLENBRADLEY800MR-PT16 SER.D110/120V50/60HZ


POMONAELECTRONICS2249-C-36COAXIALCABLEASSEMBLY50OHM-RGC58C


CONNECTIVITY/AMP206226-1CIRCULARCONNECTORRECEPTACLE46F1153


YAMATAKESL1-DCOMPACTROLLERLIMITSWITCHBASEONLYEN60947-5-1


NIBCUTLER-HAMMERE51RCRECEPTACLEA.C.-3WIRE，E51-RCS


NIBBRADHARRISON40711MINI-CHANGECORDSET2PFEMALE6"16-2PVCCORD，40711+


NIBALLENBRADLEY800T-N209RRED 


WOODHEADBRADHARRISONSAFETYYELLOWAWMSTYLE2661VM-118WG/4105CE18424


TELEMECANIQUEZB6Z1BCONTACTBLOCKS32570


ALLENBRADLEY800EM-P4REDPILOT 


TURCKRKM30-2MMINI-FASTCORDSETID:U2027


PIZZATOFK301LIMITSWITCHWITHSHORTPISTONPLUNGERF13FR1-105521


AMPHENOL97-3057-1012CABLECLAMPU10-824810-012


ALLENBRADLEY800T-J2SELECTORSWITCHSER.TW/800T-XA 


ALLENBRADLEY800T-N42 


ALLENBRADLEY1492STYLEHBLUETERMINALBLOCKS，1492-H


SMCVVQ4000-50B-N11FITTINGS3/8"


NIBGENERALELECTRIC183B4226P-3TERMINALBOARDEB27A08SC


OMRONXW2B-20G5CONNECTOR 


THOMAS&BETTSCAT.NO.390ANTI-SHORT 


HONEYWELLBZE6-2RQ8LIMITSWITCHBASEW/DD-10962 


THOMAS&BETTSC10-14 


PANDUITDV14-250B-CPAN-TERMTERMINALSDV14250BC，WIRESIZE:16-14


GEMS26717LIQUID 


SCOTCHLOKMV10-14FLXFORKTERMINALS12-10AWG1/4