AliBahar

Hi every body, I have performed a non standard protocol for communications between RTU and MTU. It does the duties properly. but I want to transfer the MTU duties to computer and perform the monitoring using software like winCC or Citect SCADA . so I need to present the arbitrary protocol for monitoring software I wonder if there is a way to do this task.

because the master must be able to handle link arbitrarily even if it does not want to communicate with slave

I use Citect Scada 7.10 with windows 7 . I want to perform communication based on DNP3 so I have employed DNPR 3.4.1.0 driver. but the error occurs due to Incompatibility between dnpr driver and running OS. I don't know what version of this driver is compatible with windows.7?

two computers communicate with each other using DNP3 protocol based on rs232. the PC#1 acts as master and it handles data transmission/reception with citect scada. PC#2 acts as slave and it performs data communication and analysis using C++ console which is created using visual studio. problem:I want to do opening and closing COM port of PC#1 using citect scada software. but I don't know how it can be done?

Hi every body I want to perform DNP3 protocol using LabView Vi functions. but i cant find any useful tutorial. please help.

yes. reference: G. Clarke and D. Reynders, "Practical Modern SCADA Protocols: DNP3, 60870.5 and Related Systems", page:97

Thanks for reply please name some of these software? is citect scada one of them?

Hi friends for DNP3 protocol , crc code is generated by the following algorithm: • Start with user data block M of k bits • Multiply by 65536 (ie append 16 zeros to end to form k + 16-bit number) • Divide by generator polynomial P to obtain quotient Q and remainder R modulo-2 division is used) • Discard Q, keep R • Invert R to obtain R′ • Append R′ to M forming message T′ to be transmitted Where generator polynomial: P = x16 + x13 + x12 + x10 + x8 + x5 + x2 + 1 This forms a 17-bit number which is 13D65 (in hex) I have created the following c code for crc calculation using modulo-2 division method: #include "stdio.h"typedef unsigned int uint;typedef unsigned char uchar;typedef unsigned long int UL;#define WIDTH (8 * sizeof(UL))#define TOPBIT (1 << (WIDTH - 1))UL POLYNOMIAL=0x3D650000;uint remainder = 0;uint crcGener(uint *message, uchar nSize){ uchar ff, bit; UL Rem; for (ff = 0; ff < nSize; ff++){ Rem ^=(message[ff]<<16); //printf("%x\n",Rem); for (bit = 0; bit <16; ++bit) { if (Rem & TOPBIT) { Rem = (Rem << 1) ^ POLYNOMIAL; } else { Rem = (Rem << 1); } } } /* * The final remainder is the CRC result. */ return (Rem);} void main(void){ uint Msg[5]={0x0564,0x0500,0x0C00,0x0100,0x0000}; remainder=crcGener(Msg, 5); printf("%x\n",remainder); getchar();}but the result is different from expected value

Hi everybody what is the commonly used software which supports DNP3 Protocol?