[ts-7000] 485 half duplex communication error

["khouryelie" <>]

Hello everyone,

i have a ser4 peripheral device on my TS-7200 
i have the 485 option on COM C and COM D

i am trying to test half duplex 485 communications on the ports
i am being able to send and not receive data

i have set the the registers correctly and having 0xc1 meaning option 485 is set

i tried loopback testing the full duplex settings, works fine
but when i go to half duplex i can only send

Does anyone know what could i be missing ?

the following is out of the manual
"The transmit enable for the RS-485 driver is controlled by the RTS signal. The 
RTS
signal must be asserted true to enable the RS-485 driver. When RTS is 
deasserted it
disables the transmit driver and enables the RS-485 receiver."

i tried dissaserting rts with the following code 

        int fd;
        int status;

        fd = open("/dev/tts/4", O_RDWR | O_SYNC);
        if (fd == -1) 
        {
                perror("Error opening file for writing");
        }

        ioctl(fd, TIOCMGET, &status);

        status &= ~TIOCM_RTS;

        ioctl(fd, TIOCMSET, &status);

stil no reading

thanks in advance guys





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