Yaskawa MP920 Communications Module - Manual (Page 285)

C.2 Sample Programs for Slave Station
C-9
C
C.2 Sample Programs for Slave Station
C.2.1 TCP (When Using Extended MEMOBUS Protocol)
#include
#include
#include
int sd; // Socket to wait for connection
int new_sd; // Socket for communication after connected
struct sockaddr_in my; // Work to store local IP address and port number
struct sockaddr_in dst; // Work to store the remote IP address and port number
char sbuf[2048]; // Send buffer
char rbuf[2048]; // Receive buffer
#define MY_IP 0xC0A8010A // Local IP address: 192.168.1.10
#define MY_PORT 8000 // Local port number: 8000
void main_tcp_Srv(void);
void mk_rsp_data(int*);
int chk_cmd_data(int);
void main_tcp_Srv(void)
{
WSADATAwsadata;
int rc, slen, rlen, send_len, client_addrlen;
// Declaration to use Winsock.dll (Always required at first.)
rc = WSAStartup( 0x0101, &wsadata );
if ( rc != 0 )
{
exit(0);
}
// Clears the sockaddr structure (IP address, port number, etc.) to zero.
memset( (char *)&my, 0, sizeof(struct sockaddr));
memset( (char *)&dst, 0, sizeof(struct sockaddr));
// Declaration of local IP address and port number
my.sin_family = AF_INET;
my.sin_addr.s_addr = htonl( MY_IP );
my.sin_port = htons( MY_PORT );
// Creates TCP socket.
sd = socket( AF_INET, SOCK_STREAM, 0 );
if ( sd <= 0 ) // A value 0 or less will be returned if an error occurs in processing.
Ethernet
CN1
PORT
MP920 (Master) Personal computer (Slave)
IP address: Depends on the Slave (remote) setting.
Port number: Depends on the Slave (remote) setting.
IP address: 192. 168. 1. 10.
Port number: 8000
＜ Configuration and Setting Example ＞