[ts-7000] Re: TS 7200 serial port at full duplex

["khouryelie" <>]

--- In  "khouryelie"  wrote:
>
> 
> thanks everyone but i am starting to think its not my code that's wrong it's 
> just the cable connections
> 
> i am configuring with my code port COM2 to 485 FULL DUPLEX
> but i am using a null modem cable THE SAME I USED TO TEST ports 232 and 
> connecting that modem cable to a converter cable from 485 -> 232 then reading 
> with minicom Through a 232 TO USB 
> 
> I think that sending from 485 port to a null modem( that was used with 
> success with 232 ) is the mistake
> 
> ANYONE KNOW IF I should get A 485 null modem cable ? 
> IS THERE ANY DIFFRENCE between NULL MODEM CABLES ? SOME FOR 232 QND OTHES FOR 
> 485 FULL DUPLEX ?
>

scratch that i am trying with loopback testing and its not working so i added 
an if tester into my CODE:

#include<unistd.h>
#include<sys/types.h>
#include<sys/mman.h>
#include<stdio.h>
#include<fcntl.h>
#include<assert.h>


int main(void)
{       
        int fd;
        volatile unsigned char *base,*comp;

        fd = open("/dev/mem", O_RDWR | O_SYNC);
        if (fd == -1) 
        {
                perror("Error opening file for writing");
        }

        base = (unsigned char 
*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x22C00000);
        if (base == MAP_FAILED)
        {
                perror ("mmap");
                return 1;
        }
        comp = (unsigned char 
*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x22C00000);
        
        *base = 0x01;
        if(*base==*comp)
                printf("ERROR \n");

        close(fd);      
}

qnd actually it does return ERROR meaning the value didnt change so i guess my 
code is wrong and i am not correctly going from 232 to 485 full duplex


Elie




------------------------------------

Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/ts-7000/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/ts-7000/join
    (Yahoo! ID required)

<*> To change settings via email:
     
    

<*> To unsubscribe from this group, send an email to:
    

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/