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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
3
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