IS200DSPXH1CAA GE 销售热线: minitii模块的25针rs232串行口接收的ascii码帧由10个ascii码字符组成,分为控制指令帧、数据指令帧两类,大致形式如下: 控制指令: (stx)(c/d)(inst)(comm)(scomm)(address)(sumcheck) 数据指令: (stx)(c/d)(data)(sumcheck) stx:*2号ascii码,占一位 c/d:控制指令时为1,数据指令时为0,占一位 inst、comm、scomm:由这三个数字*需要返回的参数,各占一位 address:*指令的发送对象,是一个三位数的十六制数,占三位 sumcheck:和校验码,占二位 data:返回的数据信息,占六位 minitii串行通讯参数在其面板上通过开关来选定。 2.2fx2nplc通讯协议简介 fx2n是三菱品牌plc在小系统控制应用中使用较多的一种经济型plc,外部设备通过232bd、485bd等插件或485adp等模块可与其建立ascii码串行通讯,读取plc内部寄存器的值。其协议格式如下: (1)读寄存器 *外设:(enq)(站号)(pc号)(命令字符)(等待时间)(头元件)(元件数)(和校验) *plc:(stx)(站号)(pc号)(返回数据)(etx)(和校验) *外设:(ack)(站号)(pc号) (2)写寄存器 *外设:(enq)(站号)(pc号)(命令字符)(等待时间)(头元件)(元件数)(写出数据)(和校验) *plc:(stx)(站号)(pc号) *enq、stx、ack、etx:为相应的ascii码 *站号:plc的站地址,为两位十六进制数(00-0fh),由plc的d8121寄存器* *pc号:用于a系列melsecnet网络中的plc,对fx2n均为ffh *命令字符:分为位读(br)、位写(bw)、字读(wr)、字写(ww) *等待时间:以10ms为单位,以十六进制数表示,占一个字符(0-f) *头元件:为要读、写的开始元件号,如m0001、d0000等。 *元件数:为要读、写的元件个数。 *返回数据、写出数据:为从plc返回的寄存器值或要写到plc的数据值 由于fx2n与中央控制柜距离较远,故本系统中采用fx2n与485bd插件,pcm311模块经232/485转换器与485bd相连,转换器与485bd之间采用两对双绞线相连,全双工方式通讯,plc串行通讯参数在d8120中设定。 2.3megabasic的语法简介 (1)串口操作:pcm模块共有二个串口,它们均可在megabasic程序中被打开,与外部进行通讯,以下为常用的串口操作函数。 *串口的打开:open, 如open#8,“com1” *串口的关闭:close 如close#8 *串口通讯参数的设定:ioctl, (2)ioctl_string格式为: baud(波特率),parity(校验),databits(数据位),stopbits(停止位),flowctl(流控制方式),physical(物理协议如232/485/422),duplexmode(通讯模式,半双工/全双工) ******************************** 厦门莫格电气自动化有限公司 杨工(销售工程师) 电话:0592-6808374 手机: 传真:0592-6514751(请备注杨工收) 工作Q 邮箱:3443643092@ 诚信经营,质量为首,诚信至上,厦门莫格竭诚为您服务! ****************************************************************** PCB CONFIG,VALVE OUT PCB CONFIG,VALVE OUT,NITRIDE PCB CONFIG,VLV OUT NIT PCB CONFIG,VLV OUT NIT PCB CONFIG,LCA BOARD PCB CONFIG,LCA NITRIDE,DWG PCB CONFIG,LCA NITRIDE,DWG PCB CONFIG,ALARM INPUT,NITRIDE PCB CONFIG,ALARM INPUT,NITRIDE PCB CONFIG,ALARM INPUT PCB CONFIG,ALARM INPUT PCB CONFIG,RELAY,NITRIDE PCB CONFIG,RELAY,NITRIDE PCB CONFIG,RELAY BD,NITRIDE PCB CONFIG,ANALOG CVD NITRIDE PCB CONFIG,ANALOG INTERFACE PCB CONFIG,ANALOG INTERFACE PCB CONFIG,ANALOG INTFC,NITR PCB,CONFIG,VALVE OUT -APL PCB CONFIG.VALVE OUTPUT BD. 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