文档介绍：台達PLC的通讯协议是公开的,只要对该协议有清楚理解,所有台达产品的通讯问题迎刃而解,下面是协议全文:municationInterface:RS-municationProtocolASCIImode,9600(Baudrate,EVEN(Parity,1(Startbit,1(municationDataFrameSTXStartcharacter…:‟(municationaddress:ADR08-mandcode:CMD08-mandconsistsof2ASCIIcodesDATA(0Contentsofdata:DATA(1n´8-bitdataconsistof2nASCIIcodes.……….n£37,maximumof74ASCIIcodesDATA(n-hecksum:HK08-bitchecksumconsistsof2ASCIIcodesEND1Endcharacter:END0END1=CR(0DH,END0=LF(municationaddressesareintherangeof0…municationaddressequalsto0meansbroadcasttoallPLC,:(ADR1,ADR0=‟1‟,‟0‟ð‟1‟=31H,…0‟=mandcodeandDATA(,(mandcode03StartingAddressHi06StartingAddressLo14NumberofPointsHi00NumberofPointsLo08ErrorCheck(LRCDANumberofPoints(max=18(for16bitregister=9(for32bitregisterExample:ReadingCoilsT20~T27fromslavedevice01PC→PLC“:0**********DACRLF”PLC→PC“:01031000010002000300040005000600070008B8CRLF”FieldNameExample(mandcode03BytesCount10DataHi(T2000DataLo(T2001DataHi(T2100DataLo(T2102DataHi(T2200DataLo(T2203DataHi(T2300DataLo(T2304DataHi(T2400DataLo(T2405DataHi(T2500DataLo(T2506DataHi(T2600DataLo(T2607DataHi(T2700DataLo(T2708ErrorCheck(HK(checksumLRC(LongitudinalRedundancyCheckiscalculatedbysummingup,module256,thevaluesofthebytesfromADR1tolastdatacharacterthencalculatingthehexadecimalrepresentationofthe2‟,reading1wordformaddress0401HofthePLCwithaddress01HSTX…:‟ADR1…0‟ADR0…1‟CMD1…0‟CMD0…3‟Startingdataaddress…0‟…4‟…0‟…1‟Numberofdata…0‟…0‟…0‟…1‟HK1…F‟HK0…6‟END1CREND0LF01H+03H+04H+01H+00+01H=0AHthe2‟plementnegationof0AHisF6HExceptionresponse:;,butcannothandleit,anexceptionresponsewillreturntothemasterde