Campbell CR300 Series Product Manual page 115

Timeout: 15 s
Probes 1, 2, 3, and 4 are connected to SDI-12 port C1.
The time line in the following table 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 helps reduce power consumption.
Table 15-1: Example power use for a network of SDI-12 probes
Time into
Measurement
Processes
Sleep
1
2–14
15
16
17-29
30
Sleep
All
Command Probes
Awake
1M!
Yes
1D0!
Yes
Time Out Probe Probe
Expires 1 (mA) 2 (mA)
0.25
120
120
Yes 120
66
66
Yes 66
0.25
Probe Probe
3 (mA) 4 (mA)
0.25 0.25 0.25
66 66 66
66 66 66
66 66 66
66 66 66
66 66 66
66 66 66
0.25 0.25 0.25
15. Communications protocols
Total
(mA)
1
318
318
318
264
264
264
1
102