
Section 11. Programming Resource Library
will respond, however, all other probes will remain active until the timeout
period expires.
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. 119) shows a 35 second power usage profile example.
Table 15. Example Power Usage Profile for a Network of SDI-12 Probes
Sec Command
All
Probes
Awake
Time
Out
Expires
1 mA 2 mA 3mA 4mA
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
119
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