Axis Communications 2120 - Manual (Page 56)

Appendix C - The Unit Connectors AXIS 2120 User’s Manual 56
Appendix C - The Unit Connectors
This section provides a detailed overview of the two supported product connectors; namely the
Serial Connector and IO Connector. It also includes a schematic diagram describing how the
AXIS 2120 is connected for a typical application:
The Auto Iris Connector
The AXIS 2120 is supplied with a varifocal DC Iris lens that automatically regulates the amount of
light entering the camera, and provides a distortion free wide-angle zoom.
The power and control signalling required for automatically adjusting the lens is supplied by the
Auto Iris Connector that attaches to the lens via a connecting cable. The connector is located at the
base of the camera, as illustrated below:
The AXIS 2120 is delivered with the Auto Iris cable already attached to the connector, and with
the Auto Iris functionality enabled by default. Should you experience any problem with
overexposure or white balance adjustment in your camera, check that the cable is firmly attached to
the Auto Iris connector. Otherwise, the Auto Iris function requires no further intervention from
the user. If you are unable to immediately resolve any apparent fault, refer to Appendix A -
Troubleshooting.
The Serial Connector
In the absence of a local network connection, the RS-232 serial connector provides a physical
interface for connecting a modem or computer to the AXIS 2120. When a local network
connection is unavailable at the point of installation, connect your PC to this connector using the
supplied Null Modem Cable to initially configure your product.
DC-Iris cable. Connected to the lens upon
delivery, this cable supplies the power and
electronic signalling to the lens from DC Iris
connector.
Below: DC Iris connector
- with cable removed.