Campbell Scientific CR23X Micrologger - Manual (Page 161)

SECTION 9. INPUT/OUTPUT INSTRUCTIONS
9-27
PARAM. DATA
NUMBER TYPE DESCRIPTION
01: 4 Bit period, 10
µ
s units
Normally this parameter represents the bit
period. If the parameter is indexed (--), the
value entered is an Input Location that contains
the bit period to use.
NOTE: The TDR Instruction 100 and the
SDM-SI04 Instruction 113 automatically
adjusts the SDM communication rate to the
fastest that will work.
*** 117 READ DATALOGGER ID ***
FUNCTION
Instruction 117 stores the datalogger ID into an
input location. The datalogger ID is set in the
D mode with Command 8 (Section 1.8.4).
PARAM DATA
NUMBER TYPE DESCRIPTION
01: 4 Input location number
Input locations altered: 1
*** 118 SDM-CAN ***
Consult Campbell Scientific.
*** 130 STATUS MONITOR ***
FUNCTION
Stores an error count or status information from
B into an input location. Indexing the
option code will cause the instruction to store
the value into an input location and then clear
the
B value. This is designed to assist
with troubleshooting and to alert users of
possible problems.
PARAM DATA
NUMBER TYPE DESCRIPTION
01: 2 Option Code (Index (--) to
reset error count after
reading)
02: 4 Input Location
Input Locations Altered: 1
Option Codes:
0 Read Watchdog or E08s Errors
1 Read Table Overruns
2 Read Low 12V Detection
3 Read Lithium Battery Voltage Level
(Indexing does nothing)
4 Read Flash Errors
5 5V Error Counter
6 Program time of Table 1 (0.407
µ
s
resolution, range is 6.8265)
7 Time required of previous instruction
8 Internal Panel temperature
Using option 8 instead of P17, thermocouple
measurements run about five times faster, but
the measurement may be as old as 2.8
minutes. This option should only be used over
P17 when timing is more important than how old
the reading is.
*** 131 EXTENDED VIBRATING WIRE ***
MEASUREMENT
FUNCTION
Excites a vibrating wire sensor with a swept
frequency (from low frequency to high), then
measures the response period and calculates
1/T
2
, where T is the period in ms. Excitation is
normally provided for each repetition. As an
option, a single excitation can be made prior to
all repetitions of the measurement. A AVW1 or
AVW4 Vibrating Wire Interface is required for
these sensors, but it may have trouble reading
the low frequencies.
T - Amount of Time to sweep between the
specified frequencies
N - Number of steps to use when sweeping
from the Starting Frequency to the
Ending Frequency
The 1/T
2
value stored in the first Input Location
specified in Parameter 11 is the result after the
# of Cycles specified in Parameter 10. The 1/T
2
value stored in the sequential Input Location is
the result after 5 times the # of Cycles specified
in Parameter 10. The value in the second Input
Location is the correct value to use unless the
reading falls into a certain range. This
instruction is most often used with the vibrating
strip. Vibrating wire/strip manufacturers have
datalogger programming instructions they
recommend using to decide which of the 2
readings to use.