[ts-7000] Failure to read serial comm on TS-7300

["shusshinchi" <>]

As mentioned in the subject. I am not doing anything complicated at all. I merely connected a peripheral device to com2 (/dev/ttyAM1). My program then sends out a series of bytes out on com2 to the peripheral device and the device responds. However, my program gets nothing. "cat /dev/ttyAM1" shows nothing either. Below is a sample code that I have used to produce this problem. Is there anything that I need to set anywhere to enable the OS to receive data on the serial comm link?

int main ( int argc, char** argv )
{
    for ( short c = 0 ; c < argc ; ++c )
        cout << "[" << c << "] " << argv[c] << endl ;

    int fd = open ( argv[1], O_RDWR | O_NOCTTY | O_NDELAY ) ;
    termios port_settings ;

    cout << "fd = " << fd << endl ;

    memset ( &port_settings, 0, sizeof port_settings ) ;
    cfsetispeed ( &port_settings, B9600 ) ;
    cfsetospeed ( &port_settings, B9600 ) ;

    port_settings.c_cc[VMIN] = 0 ;
    port_settings.c_cc[VTIME] = 10 ;
    
    port_settings.c_iflag &= ~ICRNL ;
    
    port_settings.c_lflag &= ~ICANON ;

    port_settings.c_cflag &= ~PARENB ;
    port_settings.c_cflag &= ~CSTOPB ;
    port_settings.c_cflag &= ~CSIZE ;
    port_settings.c_cflag &= ~CRTSCTS ;
    port_settings.c_cflag |= CS8 ;
    port_settings.c_cflag |= CREAD ;
    port_settings.c_cflag |= CLOCAL ;

    tcsetattr ( fd, TCSANOW, &port_settings ) ;
    tcflush( f d, TCIOFLUSH ) ;

    char output[ ] = { 0x06, 0x01, 0x00, 0x00, 0x00, 0x10, 0x3c, 0x71 } ;
    short charCount = 0 ;
    char c ;
    char cA[8] ;
    int r ;
    
    memset ( cA, 0, 8 ) ;

    cA[7] = '\0' ;

    tcflush ( fd, TCIOFLUSH ) ;
    write ( fd, output, 8 ) ;

    usleep ( 500000 ) ;

    cout << "Bytes read = " << ( r = read ( fd, cA, 7 ) ) << endl ; // this line fails to read anything

    tcflush ( fd, TCIOFLUSH ) ;
        
    if ( r == -1 )
    {
            switch ( errno )
            {
                case EAGAIN : cout << "eagain" << endl ; sleep ( 1 ) ; break ;
                case EBADF : cout << "ebadf" << endl ; break ;
                case EFAULT : cout << "efault" << endl ; break ;
                case EINTR : cout << "eintr" << endl ; break ;
                case EINVAL : cout << "einval" << endl ; break ;
                case EIO : cout << "eio" << endl ; break ;
                case EISDIR : cout << "eisdir" << endl ; break ;
                default : cout << "errno = " << errno ;
            }
    }
}

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