Campbell CR1000X - Page 114

Table 7-1: Example power use for a network of SDI-12 probes
Time into
Measurement
Processes
Command
All
Probes
Awake
Time
Out
Expires
Probe
1 (mA)
Probe
2 (mA)
Probe
3 (mA)
Probe
4 (mA)
Total
(mA)
Sleep 0.25 0.25 0.25 0.25 1
1
1M!
Yes 120 66 66 66 318
2–14 120 66 66 66 318
15 Yes 120 66 66 66 318
16
1D0!
Yes 66 66 66 66 264
17-29 66 66 66 66 264
30 Yes 66 66 66 66 264
Sleep 0.25 0.25 0.25 0.25 1
7. Communications Protocols 98