Dahua VTO4202F Series Quick Start Manual page 10

Figure 2-7
Table 2-6 Button module (front panel) description
No. Name
1 User directory
2 Call button
Figure 2-8
Table 2-7 Button module (rear panel) description
No. Name
1 Cascade input port
2 Cascade output port
Five-button module (front panel)
Description
Display user information according to buttons.
Call the VTH and call the management center (you
need to do seetings on the web first).
Five-button module (rear panel)
Description
Connected to other modules.
Structure 5