how to access a card modicon pci-85 from delphi7 and dialog with schneider pcs automat

Posted on 2007-11-22
Last Modified: 2013-11-09
In the past I have write a program with delphi1 to send data to schneider automat I dialog with modicn pci-85 interface card thru interrupt $5C. Now I want rewrite this program with delphi7, I try to use netbios, but I access always network interface cad of the pc. How can I acces the modicon pci-85 inteface.
thank you.
Question by:knollcompusoft
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LVL 18

Expert Comment

ID: 20351508
Do you have a code snipet we could see?

What OS did you use for the Delphi 1 application?
What OS are you using now for the Delphi 7 application?

Those are very important questions.


Author Comment

ID: 20356755
thank you for your answer.
For Delphi 1 I did use Win 98SE
for Delphi 7 I use win XP

code for ncb addname in delphi 1 with unit netbios who use int $5c
 with ncb do
   callname[3]:=chr(adresse); {43}
    Command   := $b0 {add_name};
    LanaNum   := 0; {adaptateur}
    retcode   := NBEInvalidLanA;

code for ncb open in delphi 7 with unit nb30 who use netap32.dll
 NCB.ncb_callname[2]:=chr(adresse); {43}
 NCB.ncb_command := Chr(NCBADDNAME); { $48 en sychrone $b0 en a.. }
 NCB.ncb_lana_num := chr(0);
 NCB.ncb_retcode := chr(NRC_INVADDRESS);

thank you
Jean Knoll
LVL 18

Expert Comment

ID: 20357925

I do not now know what kind of access software/library (NCB) you are using or how it access the hardware.

In WinNT, 2K, XP and Vista you MUST have a device driver to directly address and access hardware or physical hardware addresses.

If the NCB library does not have such a function, or it is something you wrote, it could be handled. In other words, the BASIC peek and poke into a hardware location will not work without such device drivers.

There are many around and some good and free. But I do not know if that is what you need.


Author Comment

ID: 20358672
Thank you for your answer, I try to be clear.
In the past my first version who use the int $5c works fine.
Know my customer change is system on win xp. I rewrite all my application.
I study what kind of example I have in c.
I attach a small example in c who works on my system, in fact I want to do the same thing in delphi7.
Unfortunatly my customer canot find the sdk.
Jean Knoll
/*name test4.c*/

/* Copyright (C) Modicon, Inc. 1989,  All Rights Reserved. */


This test program uses the SA85.SYS device driver to read 125 holding

registers from the MODBUS slave which is found at the given node number.

In order to use this program, enter the following command:

    A>TEST4 12

where "12" is the slave node we want to read from.





#define STRICT

#include <windows.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <conio.h>

#include <signal.h>

#include "netbios.h"

#include "netlib.h"




int main(int argc, char *argv[] );

void dump(int qty, UNALIGNED USHORT* buff);

void control_c(int sig);


global variables


char mbuffer[256];

char path[ 80 ];

int completed;




int main( argc, argv )

int argc;

char *argv[];


    NCB *nd;

    int ret_val;

    int i;

    printf( "MODBUS Command/Response test.  Strike any key to abort.\n" );

    if( argc < 2 ) {

        printf( "Usage is: A>TEST4 <slave node>\n");

        exit( 1 );


    ret_val = sscanf( argv[ 1 ], "%d", &i );

    if( ret_val != 1 || i < 1 || i > 64 ) {

        printf( "Node number must be in the range 1 to 64. " );

        exit( 1 );


    if( signal( SIGINT, control_c ) == SIG_ERR ) {

        printf( "Unable to redirect Control-C." );

        exit( 1 );



    sprintf( path, "DM.%d.", i );

    if ((nd = ncb_open( path, 0 )) == NULL) {

        printf("Unable to open DATA MASTER path.\n");



    printf("Path %02X opened\n", nd->NCB_NUM);

    printf("Routing info: %c%c.%d.%d.%d.%d.%d\n",








    completed = 0;          /* global variable, do while zero */

    while( !completed ) {

	    if( kbhit() )

            completed = 1;


         * Note: filling in mbuffer[0] with the slave address

         * is actually unecessary, since it was specified above

         * in the ncb_open.  It is done here, and the buffer

         * pointer adjusted by 1 in ncb_send, to provide ease-of-use

         * and compatibility with existing modbus applications.


        mbuffer[0] = 0x5;   /*slave address*/

        mbuffer[1] = 0x3;   /*command*/

        mbuffer[2] = 0x0;   /*offset high*/

        mbuffer[3] = 0x0;   /*offset low*/

        mbuffer[4] = 0x0;   /*reg count high*/

        mbuffer[5] = 125;   /* reg count low*/

        if (ncb_send(nd, 6, mbuffer, 10) != 0) {

                        /*send the command*/

            printf("Send error: %d.\n", nd->NCB_RETCODE);

            ret_val = ncb_close(nd);    /*close the path*/



        if (ncb_receive_wait(nd, mbuffer, 10) != 0)

                        /*try to receive*/

            printf("\nReceive error: %d.\n", nd->NCB_RETCODE);


		    dump( 125, (PUSHORT) &mbuffer[ 3 ]); 


    ncb_close(nd);      /*close the path*/

    exit(0);            /* good exit */

    return( 0 );




Dump the contents of the buffer for the length specified.


void dump(qty, buff)

int qty;				    /* qty of bytes to dump */

UNALIGNED USHORT* buff;	    /* buffer with the data */

	{					    /* dump_lines */

	int i = 0, j;

    unsigned int out_value;


	do	{


		for(j = 0;  j < 8 && i < qty;  j++,  i++) {

            out_value = ((*buff << 8) & 0xff00) | ((*buff >> 8) & 0xff);

            printf("%04X ", out_value);



    } while (i < qty);


	}					/* dump_lines */



This routine replaces the control-C handler supplied by DOS.  When you

type a control_C, the program will vector to this routine, which will

set the completed flag to non-zero.  In this test program, this will cause

the infinite loop within main to terminate.


void control_c(int sig)


    signal( SIGINT, SIG_IGN );          /* disable control-c */

    completed = 1;                      /* will cause main loop to complete */

    signal( SIGINT, control_c );        /* reset control-c handler */


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LVL 18

Accepted Solution

Johnjces earned 500 total points
ID: 20358749
It appears to me that this I/O library was written for DOS and early versions of Windows, I.E. 3.X, 95, 98.

This simply will not work on NT, 2K, XP and Vista.

Without an updated IO device driver form this manufacturer you will have a tough time.

If you know what address locations you need to read and write have  a look at WinRingO:

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.


Author Comment

ID: 20358803
thank you,
I try to obtain one good release of sdk and I see wich library I can use in 32bits.
I don't know WinRingO.
I go to see if I can use.
Can I recontact you when I have the sdk?
LVL 18

Expert Comment

ID: 20358822

Best is through this unless you close it.


Author Comment

ID: 20382659
Now I have received the cyberlogic SDK for modicon interface (for C). You can see this sdk including library and examples here:
I wish to use the netlib in this library with delphi 7, in delphi7 I have one library : nb30 who use netlib32.dll who access network card.
Is it possible to modify nb30 for using the cyberlogic library.
thank you.

LVL 18

Expert Comment

ID: 20382783
From here I do not know and cannot help you as I simply do not know. Sorry.

Also, sounds like a new question/thread.


Author Comment

ID: 20402125
Thank you very much for your remarks.
In the sdk of the modicon pci 85 card I have one dll: netlib.dll.
This dll acced to the card.
I write one delphi unit who access the dll and all works.
I send you sample of the code.
best regards
Jean Knoll
function ncb_open(name:pchar;lan:integer):pncb; stdcall;


function ncb_open; external 'netlib.dll' name 'ncb_open';

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Expert Comment

ID: 21216654
Forced accept.

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