[ts-7000] RS-485 code not working on TS-7260

["Devashish" <>]

I am working on the TS-7260 for the first time.I am trying out this 
program which does read/write operations on the RS-485 port provided.
The problem with this program is that it is able to write properly 
onto the port but unable to read from the port.
Please help me out.....
Enclosed is the C code.....
Please reply in case you need more details.
Thanking you. 

//Program for read/write operations on RS-485
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <assert.h>
#include <signal.h>

#include <time.h>

#include "ts_sbc.h"
#include <sys/ioctl.h>
//#include "ioctls.h"

#define port485 "/dev/ttyAM1"  // RS485 dev name

#define TIOC_SBCC485 _IOW('T',0x70,int) /*TS RTS/485 mode Clear*/
#define TIOC_SBCS485 _IOW('T',0x71,int) /*TS RTS/485 mode Set */

typedef unsigned char uchar;
typedef volatile unsigned char vuchar;

typedef uchar bool;
#define TRUE 1
#define FALSE 0

int com;
struct termios options;

int openPort(char* port);
bool has485();
int init();

//-------------------------------------
bool has485(){
        uchar ccc;
        vuchar *chip,*ch;
        int fd;

        fd = open( "/dev/mem", O_RDWR );
        chip = (vuchar*)mmap( 0, getpagesize(), 
PROT_READ|PROT_WRITE,MAP_SHARED, fd, 0x22c00000 );
        ccc = *chip;
        printf("mr=%04x\n",ccc);

        chip = (vuchar*)mmap( 0, getpagesize(), 
PROT_READ|PROT_WRITE,MAP_SHARED, fd,0x22400000 );
        ccc = *chip;
        printf("mr2 = %04x\n",ccc);
        *chip = 0x04;

//      ch = (vuchar*)mmap( 0, getpagesize(), 
PROT_READ|PROT_WRITE,MAP_SHARED, fd,0x23000000 );
//      *ch= 0x01;
        close( fd );
        return (ccc & 0x02) ? TRUE:FALSE;
}
//------------------------------------------------
int openPort(char* port){
        int mcr;
        int err;

        if((com=open(port, O_RDWR | O_NOCTTY | O_NDELAY))!=-1){
                tcgetattr(com, &options);
                options.c_cflag=(CS8 | CLOCAL | CREAD);
                options.c_iflag=(IGNBRK | IGNPAR );
        //      options.c_oflag=OPOST;
        //      options.c_lflag=0;
                options.c_lflag = ICANON;
                
                cfsetispeed(&options, B9600);
                cfsetospeed(&options, B9600);
                tcsetattr(com, TCSANOW, &options);

                tcflush( com, TCIFLUSH);
                fcntl(com, F_SETFL, FNDELAY);
                
                printf("Setting mode \n");
                mcr=AUTO485HD; 
                err=ioctl(com, TIOC_SBCS485, &mcr);
                if(err) 
                        printf("err = %d\n", err);

                printf("Mode OK\n");
                return 0;
        }
        printf("OPEN FAILED!\n");
        return 1;
}
//-------------------------------------
int init(){
        if(has485())    return openPort(port485);
        else                    return 1;
}
//-------------------------------------
int main(){
        int n, rd;
        char buf[512], dbuf[30]="ts7260\n";

        init();
        //03/05/00/01/ff/00/dc/18 on
        //03/05/00/01/00/00/9d/e8 off
        buf[0]=0x03; //slave address 3
        buf[1]=0x05; //force single coil
        buf[2]=0x00; //coil #0001
        buf[3]=0x01;
        buf[4]=0xff; //turn it ON (ff00)
        buf[5]=0x00;
        buf[6]=0xdc; //crc hi
        buf[7]=0x18; //crc lo
        
        for(n=0; n<4; n++){
                printf("Writing %d...\n",n);
                write( com, dbuf, 7);
                sleep(1);
        }
        sleep(1);
        memset(buf,0,512);
        printf ("while...\n");

        while(1){
                
                rd = read(com, buf, 10);
        //      buf[rd]=0;
                if(rd>0)        printf(":%s",buf);
        }
        exit(0);
}




 
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