[ts-7000] Re: 485 half duplex communication error

["Harold" <>]

Maybe the RTS polarity is inverted?
Have you tried setting RTS low to transmit and setting RTS high to receive?


--- In  "khouryelie"  wrote:
>
> thank you Jim for your reply,
> 
> 1. this is my actual code 
> 
> 
> int main(void)
> {
> 
>         int fd;
>         int status,val,prev;
> 
>       fd = open("/dev/tts/5", O_RDWR | O_SYNC);
>       if (fd == -1) 
>       {
>               perror("Error opening file for writing");
>       }
> 
>         ioctl(fd, TIOCMGET, &status);
>       
>       prev = TIOCM_RTS;
>         status &= ~TIOCM_RTS;
> 
>         val=(ioctl(fd, TIOCMSET, &status));
>       if (val != 0)
>               printf("Error ioctl");
> 
> 2. i am actually always having negative 5 6 on rts 
> 
> can you guide me from here ?
> 
> why can i send if it was at start negative 5 at RTS 
> it makes no sens
>




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