9.7. MONITORING It is common for manufacturers to have on the DLL of the device a monitoring menu, where there are parameters with DYNAMIC class. The VMT-HART identifies this type of class and periodically sends HART commands to update those parameters on the screen. Figure 9.11 – Monitoring screen. At the time of transmission of the HART message by VMT-HART, the icon that appears at the top of the screen is changed to the waveform (Figure 9:12). Figure 9.12 – Transmition icon.