Campbell Scientific CC5MPX and CC5MPXWD Digital Network Cameras - Manual (Page 96)

Section 15. Power Calculations and Timings
15-2
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 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 (bps)
Time (Seconds)
per 100 kbytes
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 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 Duration +
Communication Time)/60
For example, suppose a camera is in the Deep Sleep state. If it sends 24
100-kbyte images per day at 115200 bps, the camera is active for:
Active Minutes = 24*(25 seconds + 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