/*---------------------------------------------------------------------------*/
/* Send ASCII characters to the port.                                        */
/*---------------------------------------------------------------------------*/
void SendAscii (void)
{
    GetCtrlVal (panel_handle, SERIAL_TBOX_SEND, send_data);
    GetCtrlIndex (panel_handle, SERIAL_SENDTERM, &send_term_index);
    switch (send_term_index)
        {
        case 1:
            strcat(send_data, "\r");
            break;
        case 2:
            strcat(send_data, "\n");
            break;
        }
    stringsize = StringLength (send_data);
    if (!send_term_index) stringsize++;	 //null that ends the string will be counted as a character 
    bytes_sent = ComWrt (comport, send_data, stringsize);
 
}


/*---------------------------------------------------------------------------*/
/* Read data from the COM port.                                              */
/*---------------------------------------------------------------------------*/
int CVICALLBACK ReadCallBack (int panel, int control, int event,
                              void *callbackData, int eventData1,
                              int eventData2)
{
    switch (event)
        {
        case EVENT_COMMIT:
            read_data[0] = '\0';
            GetCtrlVal (panel_handle, SERIAL_READ_COUNT, &read_cnt);
            GetCtrlIndex (panel_handle, SERIAL_READTERM, &read_term_index);
            switch (read_term_index)
                {
                case 0:
                    read_term = 0;
                    break;
                case 1:
                    read_term = 13;
                    break;
                case 2:
                    read_term = 10;
                    break;
                }

            	bytes_read = ComRdTerm (comport, read_data, read_cnt,
                                        read_term);

            /*  Copy subset of read_data into tbox string for display.
                ComRdTerm does not automatically put null byte after
                number of bytes read into read_data string. */
            CopyString (tbox_read_data, 0, read_data, 0, bytes_read);
            SetCtrlVal (panel_handle, SERIAL_TBOX_READ, tbox_read_data);
            RS232Error = ReturnRS232Err ();
            if (RS232Error)
                DisplayRS232Error ();
            break;
        case EVENT_RIGHT_CLICK :
            break;
        }
    return 0;
}