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#include unsigned char Mbs_slave; /* slave number */ pthread_t Mbs_thread; /* slave thread */ int Mbs_device; /* slave device */ /********************************************

#include #include /************************************************************************************ Mb_test_crc : check the crc of a packet ********************************

/* #ifndef __modbus__ #define __modbus__ 1 */ #include #include #include #include #include #include #include #include

#include #include int Mb_device; /* device tu use */ int Mbm_Pid_Child; /* PID child used to read the slave answer */ int Mbm_Pid_Sleep; /* PID use to wait the end of the t

#include /* compiling : gcc master-example.c -o master-example -lmodbus */ int main() { int device; Mbm_trame trame; int result; int data_in[256]; int data_out[256]; cha

/*CRC校验码计算参考程序 CRC码的计算方法如下 CRC码的计算方法如下: 1．预置1个16位的寄存器（下称CRC寄存器），初试化其内容为十六进制数0xFFFF； 2．把第一个待计算的数据即通讯信息帧的首字节与CRC寄存器的低8位相异或，把结果放回CRC寄存器； 3．把CRC寄存器的内容右移一位用0填补最高位即进行逻辑移位处理并检查右移后的移出位； 4．如果移出位为0重复第3步即再次 ...

#include"pic18.h" #define crl RB1 unsigned char checkerror,recetimeout,localaddr=0x01; unsigned char rececount=0,rececount_temp=0, flag_time0=0; unsigned char send_buf[64]; unsigned char rec

Option Explicit Private Text1text As String Private RTUCRC As String '串口选择 Private Sub Combo1_Click() MSComm1.CommPort = Combo1.ListIndex + 1 End Sub '数据位改变 Private Sub Combo2_Cl

通过S7-200西门子PLC做串口通讯 实现Modbus RTU协议通讯 自己写的 。。 Function crcresult(ByVal data As Long, ByVal genpoly As Long, ByVal crcdata As Long) As Long Dim tmpi As Integer data = data * 2 For tmpi = 8