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HTTP Server in the ADAM-5510 Ethernet Controller Series

Since the ADAM-5510 PC-based Controller Series are now equipped with Ethernet, Advantech introduces the HTTP Server function which enables web monitoring & control. In order to better understand this function, we have illustrated the system process in the diagram below. This diagram shows the software architecture of HTTP Server function. The HTTP Server is built in the ADAM-5510/TCP (or ADAM-5510E/TCP) Ethernet Controller. Whenever users open the IE Browser to acquire data from the ADAM-5510/TCP Controller through the Internet or Intranet, it will call on the existing web pages to provide a monitoring and control portal. All of the commands from the web page must be linked via a CGI program to the C control program which handles the read/write functions in the ADAM-5000 I/O modules.


Basically, there are three steps in the process of web monitoring & control:
1. Registration: Register an HTML name for the web page you designed
2. User login and invoke control program: After registration, users can invoke local control program through the login server
3. Local I/O activated by local control program

The following programming code is a quick example of data read from the ADAM-5000 I/O modules.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <process.h>

#include "5510drv.h"
#include "CGI_Lib.h"


FILE *fp;
int number = 0;
int count = 1;

unsigned LocalDIO(void);
unsigned int LocalAIO(void);
void ReplaceStr(char *ptr_str1, char *ptr_str2, int len_str);

void main(void)
{
char * homepage_name = "index.htm";

Init501718(3);

if(!Http_Server_Reg(homepage_name)) // registration
return;

printf("Program exiting...");
HttpDeRegister("index.htm");
}


int far Callback(HTTP_PARAMS far* psParams) // implement your program in this function
{
static char *ptr_XX = 0;
static char *ptr_OO = 0;
char *tmpStr = 0;
static char Htm_Content[] = "HTTP/1.0 200 OK\r\n" // content of html page, content=1
"Content-type: text/html\r\n\r\n" // means refreshes every 1 second
"<html><META HTTP-EQUIV=""Refresh"" content=1>"
"<b>Adam-5051 status is OOOOOOO</b><p>"
"<b>Adam-5017 channel 0 status is XXXXXXX</b>"
"</html>";


number++;
printf("Refresh %d times...\n", number);

if (!ptr_OO)
ptr_OO = strstr(Htm_Content, "OOO");

sprintf(tmpStr, "0x%X", LocalDIO());
ReplaceStr(ptr_OO, tmpStr, 7);
tmpStr = 0;
if (!ptr_XX)
ptr_XX = strstr(Htm_Content, "XXX");
sprintf(tmpStr, "%d", LocalAIO());
ReplaceStr(ptr_XX, tmpStr, 7);
HttpSendData(psParams->iHandle, Htm_Content, strlen(Htm_Content));
return RET_DONE;
}


unsigned LocalDIO(void) // set Adam-5056&5068 and return Adam-5051 Status
{
unsigned div, dov;
char dov1;

if(count%2==0)
{
dov = 0xffff;
dov1 = 0x0;
}
else
{
dov = 0x0000;
dov1 = 0xff;
}

count++;
if(count>100)
count = 1;
Set5068(&dov1,2,0,AByte); //slot 2
Set5056(&dov,1,0,AWord); //slot 1

Get5051(0,0,AWord,&div); //slot 0
return ~div;
}

unsigned int LocalAIO(void) //return Adam-5017 channel 0 status
{

unsigned int aiv;
int ch, tmpcnt;

tmpcnt=0;
while(1)
{
if(AiUpdate(3,0)==0)
{
tmpcnt++;
Get501718(3, 0, &aiv);
if(tmpcnt>=8)
break;
}
}
return aiv;
}

void ReplaceStr(char *ptr_str1, char *ptr_str2, int len_str) // replace string
{
int i;
for(i=0; i<len_str; i++)
ptr_str1[i] = 32;

for(i=0; i<strlen(ptr_str2); i++)
ptr_str1[i] = ptr_str2[i];
}

By implementing the above programming code, users can read the following ADAM-5051/5017 data from the web browser.

  

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