Yaskawa MP920 Communications Module - Manual (Page 278)

Appendix C C Language Sample Programs
C.1.1 TCP (When Using Extended MEMOBUS Protocol (SFC = 09))
C-2
C.1 Sample Programs for Master Station
The programs listed in this appendix were prepared only for reference purpose and they may not
operate correctly in actual applications. To execute the programs, a socket library and C com-
piler must be installed on the personal computer.
The brief explanations on the program contents are written in italics after double-slash (//) in the
programs.
The line on the left end of the program indicates the positions of paragraph indentions.
C.1.1 TCP (When Using Extended MEMOBUS Protocol (SFC = 09))
#include
#include
#include
int sd; /* Socket Discripter */
struct sockaddr_in my;
struct sockaddr_in dst;
#define MY_IP 0xC0A80103 // Local IP address: 192.168.1.3
#define MY_PORT 5000 // Local port number
#define DST_IP 0xC0A80101 // Remote IP address: 192.168.1.1
#define DST_PORT 5000 // Remote port number
char sbuf[2048];
char rbuf[2048];
void main_tcp(void);
void mk_cmd_data(void);
int chk_rsp_data(int);
void main_tcp(void)
{
WSADATAwsadata;
int rc, slen, rlen;
// Declaration to use Winsock.dll (Always required at first.)
rc = WSAStartup( 0x0101, &wsadata );
if ( rc != 0 )
{
exit(0);
}
Ethernet
CN1
PORT
MP920 (Slave) Personal computer (Master)
IP address 䋺192. 168. 1. 1
Port number 䋺5000
IP address 䋺192. 168. 1. 3.
Port number 䋺5000
＜ Configuration and Setting Example ＞