Campbell-scientific CR800 and CR850 Measurement and Control Systems Manual de usuario Pagina 187

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Section 7. Installation
187
Example:
Probe: Water Content
Power Usage:
Quiescent: 0.25 mA
Measurement: 120 mA
Measurement Time: 15 s
Active: 66 mA
Timeout: 15 s
Probes 1, 2, 3, and 4 are connected to SDI-12 / Control Port 1.
The time line in table Example Power Usage Profile for a Network of SDI-12
Probes
(p. 187) shows a 35-second power-usage profile example.
For most applications, total power usage of 318 mA for 15 seconds is not
excessive, but if 16 probes were wired to the same SDI-12 port, the resulting
power draw would be excessive. Spreading sensors over several SDI-12 terminals
will help reduce power consumption.
Table 28. Example Power Usage Profile for a Network of SDI-12 Probes
Sec Command
All
Probes
Awake
Time
Out
Expires
1 mA 2 mA 3 mA 4 mA
Total
mA
1
1M!
Yes 120 66 66 66 318
2 120 66 66 66 318
• • • •
• • • •
• • • •
14 120 66 66 66 318
15 Yes 120 66 66 66 318
16
1D0!
Yes 66 66 66 66 264
17 66 66 66 66 264
• • • •
• • • •
• • • •
29 66 66 66 66 264
30 Yes 66 66 66 66 264
31 0.25 0.25 0.25 0.25 1
• • • •
• • • •
• • • •
35 0.25 0.25 0.25 0.25 1
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