Mitsubishi Electric FR-D720S SC EC Instruction Manual page 363

Parameter
Instructions for the program
When data from the computer has any error, the inverter does not accept that data. Hence, in
the user program, always insert a retry program for data error.
All data communication, e.g. run command or monitoring, are started when the computer gives
a communication request. The inverter does not return any data without the computer's request.
Hence, design the program so that the computer gives a data read request for monitoring, etc.
as required.
Program example
To change the operation mode to computer link operation
Programming example of Microsoft
#include <stdio.h>
#include <windows.h>
void main(void){
HANDLE hCom;
DCB hDcb;
COMMTIMEOUTS hTim;
char szTx[0x10];
char szRx[0x10];
char szCommand[0x10]; //Command
int nTx,nRx;
int nSum;
BOOL bRet;
int nRet;
int i;
//**** Opens COM1 Port****
hCom = CreateFile ("COM1", (GENERIC_READ | GENERIC_WRITE), 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hCom != NULL) {
//**** Makes a communication setting of COM1 port****
GetCommState(hCom,&hDcb);
hDcb.DCBlength = sizeof(DCB);
hDcb.BaudRate = 19200;
hDcb.ByteSize = 8;
hDcb.Parity = 2;
hDcb.StopBits = 2;
bRet = SetCommState(hCom,&hDcb);
if (bRet == TRUE) {
//**** Makes a time out setting of COM1 port****
Get CommTimeouts(hCom,&hTim);
hTim.WriteTotalTimeoutConstant = 1000;
hTim.ReadTotalTimeoutConstant = 1000;
SetCommTimeouts(hCom,&hTim);
//**** Sets the command to switch the operation mode of the station 1 inverter to the network operation mode ****
sprintf(szCommand,"01FB10000");
nTx = strlen(szCommand);
//**** Generates sum code****
nSum = 0;
for (i = 0;i < nTx;i++) {
}
//**** Generates send data****
memset(szTx,0,sizeof(szTx));
memset(szRx,0,sizeof(szRx));
sprintf(szTx,"\5%s%02X",szCommand,nSum);
nTx = 1 + nTx + 2;
nRet = WriteFile(hCom,szTx,nTx,&nTx,NULL);
//**** Sending ****
if(nRet != 0) {
nRet = ReadFile(hCom,szRx,sizeof(szRx),&nRx,NULL);
//**** Receiving ****
}
}
CloseHandle(hCom);
}
}
Fig. 6-113:Programming example
FR-D700 SC EC
//Communication handle
//Structure for communication setting
//Structure for time out setting
//Send buffer
//Receive buffer
//For buffer size storing
//For sum code calculation
nSum += szCommand[i];
nSum &= (0xff);
if(nRet != 0) {
//**** Displays the receive data ****
for(i = 0;i < nRx;i++) {
printf("%02X ",(BYTE)szRx[i]); //Consol output of receive data
//Displays ASCII coder in hexadecimal. Displays 30 when "0"
}
printf("\n\r");
}
Communication operation and settings
® ®
Visual C++ (Ver.6.0)
//Retrieves current communication information
//Structure size setting
//Communication speed=19200bps
//Data length=8bit
//Even parity
//Stop bit=2bit
//Sets the changed communication data
/Obtains the current time out value
//Write time out 1s
//Read time out 1s
//Changed time out value setting
//Send data (NET operation write)
//Send data size
//Initialization of sum data
//Calculates sum code
//Masks data
//Initialization of send buffer
//Initialization of receive buffer
//ENQ code+send data+sum code
//Number of ENQ code+number of send data+number of sum code
//Close communication port
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