Campbell CR23X Spécifications télécharger pdf (Page 161)

SECTION 9. INPUT/OUTPUT INSTRUCTIONS

9-27

PARAM. DATA

NUMBER TYPE DESCRIPTION

01: 4 Bit period, 10µs 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 µs

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.

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 373 374

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