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Connecting Cisco Analog Video Gateway Network Modules to the Network

RS-485 Serial Communication Interfaces

The EVM-IPVS-16A network module supports a half-duplex, two-wire RS-485 communication

network, which sometimes is called a ring. The EIA/TIA RS-485 communications standard supports up

to 32 devices (driver/receiver pairs) on a cable of up to 4,000 feet. The EVM-IPVS-16A network module

has two RS-485 ports, supporting up to 64 devices. The EVM-IPVS-16A network module typically acts

as the master for each of the two RS-485 networks.

The RS-485 ports can be used to control camera pan, tilt, and zoom (PTZ) functions, as well as other

RS-485 devices. Because PTZ camera types use different protocols, the EVM-IPVS-16A network

module only supports pass-through mode. In pass-through mode PTZ commands and other data will not

be interpreted.

Alarm Inputs and Control Relay Outputs

The EVM-IPVS-16A network module supports eight contact closure interfaces. Interfaces A0, A1, A2,

and A3 can be configured as alarm input or relay output, the other interfaces are input only. They are

used to detect contact trigger events and control external devices.

In most cases, the contact closure interfaces will be connected to a patch panel through the two terminal

block ports on the network module. The patch panel can provide the bias to the circuit.

The alarm signal input and output (I/O) connections on this unit are intended only for connection to

Caution

NEC/CEC Class 2 or equivalent circuit. This means that the voltages applied to alarm signal I/O

connections should not exceed 42.4 Vpk or 60 Vdc and it should be a limited/fused power source. For

more details on Class 2 circuits, refer to the National Electrical Code/Canadian Electrical Code.

Table 1

Specification

Alarm Input Sense Voltage Range

Alarm Output Current Load Range

Gigabit Ethernet Port

The external Gigabit Ethernet port is disabled by default. If you enable the Gigabit Ethernet interface, it

can act as a routable interface in your network.

Alarm Input and Output Interface Specifications

Connecting Cisco Analog Video Gateway Network Modules to the Network

Information About the EVM-IPVS-16A Network Module

Range

12 V to 24 V

0 mA to 170 mA