Vivotek IP2121 - Manual (Page 43)

- 41 -
motion amplitude of some object in the monitored screen is over the settings, a white M
in red background will indicate at the upper-right corner of the window.
Motion detection is provided as reference because it is very environment-dependent.
Especially working by the very sensitive settings, some triggered events may be
considered as false alarms though there is tiny difference happening indeed. It can be
affected by florescent light flashing, shadow shifting, and so on.
COM port configuration
Choose serial interface
There are two types of serial interfaces supported by COM port but only one interface can
be used at one time. Administrators must set the correct “Interface mode” between
RS232 and RS485 according to the attached device.
Choose device driver
If the attached device is PT scanner, administrators should select the appropriate model.
Refer to our Web site for newly supported PT scanner. If the attached PT scanner is not
in the support list, administrators can select “Custom Camera” to enter the proprietary
commands for pan, tilt, zoom and focus control. If it is not a PT scanner but another
serial device like video multiplexer, administrators can select the “Generic CGI
command” to control the device via CGI commands. See the URL of External Device
Control section in the Chapter Advanced Function for details.
COM port configuration
After saving the driver type, the COM port configuration will show up for entering the
correct settings that depends on the camera type. Refer to the Appendix Settings for
Supported PT scanner for default settings of supported PT scanner including baud rate,
data bits, stop bit and parity bit.
Custom commands
Network Camera provides five more custom commands other than general pan, tilt,
zoom and preset functions. Administrators can click on and refer to
the instruction manual of the attached device to setup frequently used functions. The
"Command" should be entered in ASCII format; Network Camera will translate it into
binary code and send it out through the serial port. For instance, a text string of
"8101ABCDEF" will be translated into five bytes of hexadecimal 81, 01, AB, CD and EF.
The maximal length of a command string is 60 which is equivalent to 30 hexadecimal
bytes. "Display string" is for text on command buttons and should be less than 8
characters. If the “Custom Camera” is selected, there will be more commands for PTZF
regarding to the custom camera.