Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 414)

Section 10. Troubleshooting
414
queue, 14 bigfreeq packets are free (one in use), and 28 lilfreeq are free (two in
use). These three pieces of information are also reported in the IP trace
(p. 434)
information every 30 seconds as lilfreeq, bigfreeq, and recvdq. If lilfreeq or
bigfreeq free packets drop and stay near zero, or if the number in rcvdq climbs
and stays high (all are rare occurrences), please contact a Campbell Scientific
application engineer as the operating system may need adjustment.
CommsMemFree(3) is encoded as follows:
CommsMemFree(3) = lilfreeq + bigfreeq*100 + rcvdq*10000 +
sendq*1000000
where,
lilfreeq = number of small TCP packets available
bigfreeq = number of large TCP packets
rcvdq = number of input packets currently waiting to be serviced
sendq = number of output packets waiting to be sent
The following expressions can be used to pick the values out of the
CommsMemFree(3) variable:
lilfreeq = CommsMemFree(3) % 100
bigfreeq = (CommsMemFree(3) / 100) % 100
rcvdq = (CommsMemFree(3) / 10000) % 100
sendq = (CommsmemFree(3) / 1000000) % 100
10.5 Power Supplies
10.5.1 Overview
Power-supply systems may include batteries, charging regulators, and a primary
power source such as solar panels or ac/ac or ac/dc transformers attached to mains
power. All components may need to be checked if the power supply is not
functioning properly.
Diagnosis and Fix Procedures
(p. 415)
includes the following flowcharts for
diagnosing or adjusting power equipment supplied by Campbell Scientific:
• Battery-voltage test
• Charging-circuit test (when using an unregulated solar panel)
• Charging-circuit test (when using a transformer)
• Adjusting charging circuit
If power supply components are working properly and the system has peripherals
with high current drain, such as a satellite transmitter, verify that the power supply
is designed to provide adequate power. Information on power supplies available
from Campbell Scientific can be obtained at www.campbellsci.com. Basic
information is available in the appendix Power Supplies
(p. 542).