Dahua VTH2221A User Manual

Product Structure 12
Figure 2-10
2.2.3 VTH15 Series Type A/Type B/Type CH
In VTH15 series, different types of digital VTH have different port positions, but the same port
provides the same function. Taking VTH1550CH as an example, specific functions of ports are
introduced, as shown in Figure 2-12.
Figure 2-11
In VTH15 type A/type B series, different types of digital VTH have different port positions, but
the same port provides the same function. Taking VTH1560B as an example, specific functions
of ports are introduced, as shown in Figure 2-12.
Figure 2-12
2.2.4 VTH5222CH/VTH5222CHW-2
Except different numbers of 2-wire port, VTH5222CH and VTH5222CHW-2 are the same in
other aspects. VTH5222CH has 1 group of 2-wire port, while VTH1550CHW-2 has 3 groups of
2-wire port. VTH5222CH provides 6-ch alarm input ports, 1-ch alarm output port, 1-ch RS485
port and 1 group of 2-wire port, as shown in Figure 2-13.

Dahua VTH2221A Specifications

General

Brand	Dahua
Model	VTH2221A
Category	Intercom System
Language	English