User`s manual

VPort 2141 Video Encoder User’s Manual System Configuration
4-16
Bandwidth Limit
The bandwidth limit affects the transmission of video streams. Once a bandwidth limit is set, the
video frame rate will change accordingly. Limiting the bandwidth is useful for balancing network
utilization when multiple VPorts are installed on the same network. This method is more effective
than just changing image quality, and is able to achieve better performance with adequate image
size and quality.
Save
After making all of the necessary modifications, click Save to store the modifications. If you have
changed the modulation type, the VPort will restart automatically.
Camera Control
The Camera Control page includes settings for PTZ driver, and various serial transmission
settings.
The VPort 2141 has 2 COM ports, COM 1 and COM 2, for connecting to external devices, such as
a motorized PTZ (PAN, TILT, ZOOM) controller.
Interface Speed
COM 1
RS-232, male DB9 Max. 115. 2 Kbps
COM 2
RS-485, Terminal block for Data+, Data- Max. 115. 2 Kbps
The COM port connection serves 2 purposes:
1. If the attached device is a PTZ camera, administrators must select the correct PTZ model
under PTZ driver options, since each PTZ camera has its own protocols for the PTZ functions.
Refer to Appendix B, Settings for Supported PTZ Cameras, to see which PTZ cameras are
supported by the VPort 2141. If the attached PTZ camera is not supported by the VPort, select
Custom Camera to enter the proprietary commands for pan, tilt, zoom, and focus control.
2. If the attached device is not a PTZ camera (e.g., a video multiplexer), select the Generic CGI
command to control the device using CGI commands. For external device control, refer to
Chapter 5, Advanced Applications, under the URL Commands for DI/DO and Camera’s
Actions settings section for more details.
The default setting is None, which means no serial device is connected to the COM port.