[ts-7000] RS-485 problem on TS-7200

["pngatlin" <>]

I have written a C program that opens the device (/dev/ttyAM1), configures the 
port for RS-485HD (using ioctl as shown in ts7200 manual), and reads the data 
being sent by the device.  This program worked during a few days of testing.  
However, now when it gets executed all I get is garbage characters being 
printed out. Nothing has changed except that the computer was physically moved 
from one location to another.  Now, even when I do testing in the lab with 
another ts-7200 computer I get the same garbage results.

Anyone encounter such inconsistency or similar with RS-485 devices on ts-7200?

In case it helps...here is my open and port configuration:

#define TIOC_SBCS485 _IOW('T',0x71, int) /*TS RTS/485 mode Set */
#define AUTO485HD 4
#define BUFFERSIZE 4109
#define BAUDRATE 19200

/* Open the port */
        fd = open(dev, O_RDWR | O_NOCTTY); 
        if (fd < 0) {
                printf("ERROR! Failed to open %s\n", dev);
                return -1;
        }

/* Configure the port */
  //-->Set the port speed
    tcgetattr(fd,&ti_prev);     
        tcgetattr(fd, &ti);
        cfsetospeed(&ti, BAUDRATE);
        cfsetispeed(&ti, BAUDRATE);
        ti.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
        
        tcsetattr(fd, TCSANOW, &ti);

  //-->Enable RS-485 in half duplex mode
    mcr = AUTO485HD;
    status=ioctl (fd, TIOC_SBCS485, &mcr); //from TS Linux manual
    if (status) {
     printf("ERROR PORT 1! TIOCSERSETRS485 failed %i\r\n", status);
     return -1;
    }



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