User Manual
79
15.2 Operation with Communications
The power calculations are more complicated when communications are
involved, as the amount of time the camera is in the Fully On active state is
increased by the amount of time it takes for the camera to transfer an image or
video.
The transfer times are influenced by two main factors: the size of the image
and the transfer speed used to send the image. The amount of time the camera
is on will be increased as the size of the image becomes larger or as the
communication rate slows down.
To properly determine the power consumption when using communications,
the additional time the camera consumes the Fully On Active Current Draw
needs to be accounted for in the power calculation. Refer to Table 15-2 File
Transfer Times Using PakBus as a guideline for determining the amount of
time it takes to transfer files using RS-232 or RS-485 PakBus
Communications.
Table 15-2 File Transfer Times Using
PakBus
Communication
BAUD RATE
Time (Seconds) per
100Kbytes
9600 240
seconds
0.0123 A-Hrs
19200 120
seconds
0.0076 A-Hrs
38400 60
seconds
0.0052 A-Hrs
57600 40
seconds
0.0044 A-Hrs
115200 30
seconds
0.0038 A-Hrs
To estimate the power consumption of the system look up the parameters in
Table 15-1 Power Consumption Table (Standalone) along with the
communication times to calculate the power consumption as follows:
•
Determine the total Active Time in Minutes:
Active Minutes = Number of Pictures Per day *(Active Du
Communication Time)/60
For a camera in the Deep Sleep state sending 24 Images per day at 115200
BAUD that are 100 Kbytes size:
Active Minutes = 24*(25 S 30 Seconds)/60 = 22 Minutes/Day of
Active Time.
•
Determine the total time in the Quiescent Low Powered State
Quiescent Minutes = 1440 Minutes Per Day - Active Minutes
Quiescent Minutes = 1440 – 22 = 1418 Minutes
