AWH计重秤通讯说明教程

AWH计重秤1.设定RS-232或串行打印机输出F5当与计算机联机时，RS-232适配卡上之J1、J3短路。利用上数键＾键或去皮键选择F5该电子秤数据通过RS-232通讯，传讯模式设定为P2连续发送。数据格式：发送的数据包为一个字符串，包括18个字符。通讯程序：接受缓冲模块：电子秤连续发送数据，不属于应答模式，通过示波器检查，为20ms发送一个数据包。FUNCTION_BLOCKReadMsg_EL1VAR_INPUT(*输入管脚定义*) CmdId2:BYTE;END_VARVAR_OUTPUT(*输出管脚定义*) RcvBuf2:ULONG;(*接收缓存区*)(*发送数据长度*)END_VARVAR(*临时变量定义*)END_VAR RcvBuf2=GW_DEFRCVBUF(CmdId2,18);END_FUNCTION_BLOCK接受缓冲模块：接受缓冲模块连续接受数据包，需要定时清缓冲区，用GW_STARTCMD(CmdId)功能。FUNCTION_BLOCKReceiveMsg_EL1VAR_INPUT(*输入管脚定义*) CmdId:BYTE; END_VARVAR_OUTPUT(*输出管脚定义*) MSG0,MSG1,MSG2,MSG3,MSG4,MSG5,MSG6,MSG7,MSG8,MSG9:BYTE; MSG10,MSG11,MSG12,MSG13,MSG14,MSG15,MSG16,MSG17:BYTE; DATALEN:UINT; END_VARVAR MsgBuf:ULONG; i,CmdId2:BYTE; b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18:BYTE; MSG_TMP:BYTE; TMP_L1,TMP_L2:LONG;END_VARDATALEN=GW_GETRCVLEN(CmdId);IFDATALEN>0THENMsgBuf=GW_GETRCVMSG(CmdId); MSG0=GW_READBUF(MsgBuf,0); (**) MSG1=GW_READBUF(MsgBuf,1); (**) MSG2=GW_READBUF(MsgBuf,2); (**) MSG3=GW_READBUF(MsgBuf,3); (**) MSG4=GW_READBUF(MsgBuf,4); (**) MSG5=GW_READBUF(MsgBuf,5); (**) MSG6=GW_READBUF(MsgBuf,6); (**) MSG7=GW_READBUF(MsgBuf,7); (**) MSG8=GW_READBUF(MsgBuf,8); (**) MSG9=GW_READBUF(MsgBuf,9); (**) MSG10=GW_READBUF(MsgBuf,10); (**) MSG11=GW_READBUF(MsgBuf,11); (**) MSG12=GW_READBUF(MsgBuf,12); (**) MSG13=GW_READBUF(MsgBuf,13); (**) MSG14=GW_READBUF(MsgBuf,14); (**) MSG15=GW_READBUF(MsgBuf,15); (**) MSG16=GW_READBUF(MsgBuf,16); (**) MSG17=GW_READBUF(MsgBuf,17); (**) GW_STARTCMD(CmdId); END_IF; END_FUNCTION_BLOCK判断模块：连续接受的数