CP341模块做MODBUS主站通信不用硬件狗程序应该怎么来写，看见网上有好多人说是可以的，就是不知道怎么来做一个模块下有7个欧姆龙的E5EC仪表怎么来进行通信485的接口
问题补充：
哪位大神有CP341的免狗程序我的邮箱1418357061@qq.com不胜感激
最佳答案
安装CP341驱动包，用ASCLL方式通讯，调用fb8、FB7。
把数据放送缓冲区，往数据缓冲区，根据周期时间上升沿触发。
在接受数据块中，设置计数轮询，触发时间计数到几，就发送那部分数据。
//——————————————————————————————————————————————-
FUNCTioNFC75:VOID//数据收发
VAR
R_CPU_NO:INT;
R_TYP:CHAR;
R_NO:INT;
R_OFFSET:INT;
R_CF_BYT:INT;
R_CF_BIT:INT;
SET_OUT:BOOL;
N:INT;
END_VAR
BEGIN
FB8.DB75(SF:=”S”//IN:CHAR
,REQ:=DB80.MC_OUT1//IN:BOOL
,R:=DB80.MC_OUT1=FALSE//IN:BOOL
,LADDR:=416//IN:INT
,DB_NO:=90//IN:INT
,DBB_NO:=0//IN:INT
,LEN:=8//IN:INT
,R_CPU_NO:=R_CPU_NO//IN:INT
,R_TYP:=R_TYP//IN:CHAR
,R_NO:=R_NO//IN:INT
,R_OFFSET:=R_OFFSET//IN:INT
,R_CF_BYT:=R_CF_BYT//IN:INT
,R_CF_BIT:=R_CF_BIT//IN:INT
);
FB7.DB76(EN_R:=DB80.MC_OUT1ORDB80.MC_OUT1=FALSE//IN:BOOL
,R:=FALSE//IN:BOOL
,LADDR:=416//IN:INT
,DB_NO:=91//IN:INT
,DBB_NO:=DB92.JS//IN:INT
);
END_FUNCTION
DATA_BLOCKDB80
STRUCT
ZD_TIME:INT;
MC_OUT1:BOOL;
MC_OUT2:BOOL;
MC_PN:BOOL;
MC_IN:BOOL;
SENT_OUT:BOOL;
END_STRUCT
BEGIN
END_DATA_BLOCK
//————————————————————————————————————————————————————–
FUNCTIONFC80:VOID//轮询计时
VAR
TIME_BCD1,TIME_BCD2:S5TIME;
OUT_PUT1,OUT_PUT2:BOOL;
N:INT;
END_VAR
BEGIN
TIME_BCD1:=S_ODT(T_NO:=T254,S:=DB80.MC_OUT2=FALSE,TV:=T#0.2S,Q:=DB80.MC_OUT1);
TIME_BCD2:=S_ODT(T_NO:=T255,S:=DB80.MC_OUT1,TV:=T#0.1S,Q:=DB80.MC_OUT2);
DB80.MC_PN:=DB80.MC_OUT1ANDNOTDB80.MC_IN;
DB80.MC_IN:=DB80.MC_OUT1;
IFDB80.MC_PNTHEN
DB80.ZD_TIME:=DB80.ZD_TIME+1;
END_IF;
IFDB80.ZD_TIME>4THEN
DB80.ZD_TIME:=0;
END_IF;
END_FUNCTION
DATA_BLOCKDB90//发送
STRUCT
SENT:ARRAY[1..8]OFBYTE;
END_STRUCT
BEGIN
END_DATA_BLOCK
DATA_BLOCKDB91//接收
STRUCT
RCV1:ARRAY[1..30]OFBYTE;
RCV2:ARRAY[1..30]OFBYTE;
RCV3:ARRAY[1..30]OFBYTE;
RCV4:ARRAY[1..30]OFBYTE;
END_STRUCT
BEGIN
END_DATA_BLOCK
DATA_BLOCKDB92//
STRUCT
JS:INT;
END_STRUCT
BEGIN
END_DATA_BLOCK
FUNCTIONFC95:VOID//发送区
IFDB80.ZD_TIME=1THEN
DB90.SENT[1]:=B#16#01;
DB90.SENT[2]:=B#16#03;
DB90.SENT[3]:=B#16#05;
DB90.SENT[4]:=B#16#00;
DB90.SENT[5]:=B#16#00;
DB90.SENT[6]:=B#16#04;
DB90.SENT[7]:=B#16#44;
DB90.SENT[8]:=B#16#C5;
DB92.JS:=0;
ELSIFDB80.ZD_TIME=2THEN
DB90.SENT[1]:=B#16#02;
DB90.SENT[2]:=B#16#03;
提问者对于答案的评价：
谢谢，我试一下
