Campbell CCFC, Руководство по эксплуатации продукта

Страница: 123 / 144

NOTE:
When the Wi-Fi is powered up and connected via an Access Point (AP) or connected to an
Existing Network (see
Existing network (p. 83)), an extra 40 mA is added to the current power
draw. When the camera is transmitting large amounts of data (e.g. when viewing live video),
an extra 10 mA is added to the power draw.
18.2 Operation with communications
Communications increases power consumption because the camera needs to be in the Fully On
active state while the camera is transferring a photo or video. The transfer times are influenced by
the photo or video size and the transfer speed used to send the file. Large files and slow
communications rates increase the amount of time the camera needs to be on.
The power calculation needs to account for the increased current draw for the time the camera is
in the Fully On current draw state. The following table provides a guideline for determining the
amount of time it takes to transfer files using RS-232 or RS-485 PakBus® communications.
Table 18-2: File transfer times using PakBus®
Communication
baud rate
Time (seconds)
per 100 KB
9600
240 seconds
0.0123 Ah
19200
120 seconds
0.0076 Ah
38400
60 seconds
0.0054 Ah
57600
40 seconds
0.0044 Ah
115200
30 seconds
0.0038 Ah
To estimate the system power consumption, use Table 18-2 (p. 117) along with the
communication times to calculate the power consumption as follows:
CCFC Field Camera 117