Mitsubishi Electric FR-D720-0.2K-G, Instruction Manual

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196
Communication operation and setting
(6) Instructions for the program
1) When data from the computer has any error, the drive unit does not accept that data. Hence, in the user program, always
insert a retry program for data error.
2) All data communication, for example, run command or monitoring, are started when the computer gives a communication
request. The drive unit 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.
3) Program example
To change the operation mode to computer link operation
Programming example of Microsoft
®
Visual C++
®
(Ver.6.0)
#include <stdio.h>
#include <windows.h>
void main(void){
HANDLE
hCom; //Communication handle
DCB hDcb; //Structure for communication setting
COMMTIMEOUTS hTim; // Structure for time out setting
char szTx[0x10]; // Send buffer
char szRx[0x10]; // Receive buffer
char szCommand[0x10];// Command
int nTx,nRx; // For buffer size storing
int nSum; // For sum code calculation
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); // Retrieves current communication information
hDcb.DCBlength = sizeof(DCB); // Structure size setting
hDcb.BaudRate = 19200; // Communication speed=19200bps
hDcb.ByteSize = 8; // Data length=8 bits
hDcb.Parity = 2; // Even parity
hDcb.StopBits = 2; // Stop bit=2 bits
bRet = SetCommState(hCom,&hDcb); // Sets the changed communication data
if (bRet == TRUE) {
//

Makes a time out setting of COM1 port

Get CommTimeouts(hCom,&hTim); // Obtains the current time out value
hTim.WriteTotalTimeoutConstant = 1000; // Write time out 1s
hTim.ReadTotalTimeoutConstant = 1000; // Read time out 1s
SetCommTimeouts(hCom,&hTim); // Changed time out value setting
//

Sets the command to switch the operation mode of the station 1 drive unit to the Network operation mode

sprintf(szCommand,"01FB10000"); // Send data (NET operation write)
nTx = strlen(szCommand); //Send data size
//

Generates sum code

nSum = 0; // Initialization of sum data
for (i = 0;i < nTx;i++) {
nSum += szCommand[i]; // Calculates sum code
nSum &= (0xff); // Masks data
}
//

Generates send data

memset(szTx,0,sizeof(szTx)); // Initialization of send buffer
memset(szRx,0,sizeof(szRx)); // Initialization of receive buffer
sprintf(szTx,"\5%s%02X",szCommand,nSum);// ENQ code+send data+sum code
nTx = 1 + nTx + 2;
// Number of ENQ code+number of send data+number of sum code
nRet = WriteFile(hCom,szTx,nTx,&nTx,NULL);
//

Sending

if(nRet != 0) {
nRet = ReadFile(hCom,szRx,sizeof(szRx),&nRx,NULL);
//

Receiving

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");
}
}
}
CloseHandle(hCom);
// Close communication port
}
}