Campbell Scientific CR23X Owner's manual

Category
Measuring, testing & control
Type
Owner's manual
CR23X Micrologge
r
Revision: 11/06
Copyright © 1986-2006
Campbell Scientific, Inc.
Warranty and Assistance
The CR23X MICROLOGGER is warranted by CAMPBELL SCIENTIFIC,
INC. to be free from defects in materials and workmanship under normal use
and service for thirty-six (36) months from date of shipment unless specified
otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s
obligation under this warranty is limited to repairing or replacing (at
CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer
shall assume all costs of removing, reinstalling, and shipping defective
products to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC,
INC. will return such products by surface carrier prepaid. This warranty shall
not apply to any CAMPBELL SCIENTIFIC, INC. products which have been
subjected to modification, misuse, neglect, accidents of nature, or shipping
damage. This warranty is in lieu of all other warranties, expressed or implied,
including warranties of merchantability or fitness for a particular purpose.
CAMPBELL SCIENTIFIC, INC. is not liable for special, indirect, incidental,
or consequential damages.
Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an
applications engineer determines the nature of the problem, an RMA number
will be issued. Please write this number clearly on the outside of the shipping
container. CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
i
CR23X MEASUREMENT AND CONTROL MODULE
TABLE OF CONTENTS
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PAGE
OV1. PHYSICAL DESCRIPTION
OV1.1 Wiring Terminals.................................................................................................................OV-4
OV1.2 Connecting Power to the CR23X........................................................................................OV-5
OV2. MEMORY AND PROGRAMMING CONCEPTS
OV2.1 Internal Memory..................................................................................................................OV-5
OV2.2 Program Tables, Execution Interval and Output Intervals..................................................OV-8
OV2.3 CR23X Instruction Types....................................................................................................OV-9
OV3. COMMUNICATING WITH CR23X
OV3.1 CR23X Keypad/Display ....................................................................................................OV-11
OV3.2 Using Computer with Datalogger Support Software.........................................................OV-12
OV3.3 ASCII Terminal or Computer with Terminal Emulator ......................................................OV-12
OV4. PROGRAMMING THE CR23X
OV4.1 Programming Sequence...................................................................................................OV-13
OV4.2 Instruction Format.............................................................................................................OV-13
OV4.3 Entering a Program...........................................................................................................OV-14
OV5. PROGRAMMING EXAMPLES
OV5.1 Sample Program 1............................................................................................................OV-15
OV5.2 Sample Program 2............................................................................................................OV-17
OV5.3 Editing an Existing Program..............................................................................................OV-18
OV6. DATA RETRIEVAL OPTIONS.................................................................................... OV-21
OV7. SPECIFICATIONS..........................................................................................................OV-23
PROGRAMMING
1. FUNCTIONAL MODES
1.1 Datalogger Programs -
1
,
2
,
3
, and
4
Modes ................................. 1-1
1.2 Setting and Displaying the Clock -
5
Mode.................................................................. 1-4
1.3 Displaying/Altering Input Memory, Flags, and Ports -
6
Mode..................................... 1-4
1.4 Compiling and Logging Data -
0
Mode ........................................................................ 1-5
1.5 Memory Allocation -
A
.................................................................................................. 1-5
1.6 Memory Testing and System Status -
B
....................................................................... 1-9
1.7
C
Mode -- Security...................................................................................................... 1-11
1.8
D
Mode -- Save or Load Program.............................................................................. 1-11
CR23X TABLE OF CONTENTS
ii
2. INTERNAL DATA STORAGE
2.1 Final Storage Areas, Output Arrays, and Memory Pointers .................................................. 2-1
2.2 Data Output Format and Range Limits.................................................................................. 2-3
2.3 Displaying Stored Data -
7
Mode................................................................................. 2-3
3. INSTRUCTION SET BASICS
3.1 Parameter Data Types........................................................................................................... 3-1
3.2 Repetitions (Reps)................................................................................................................. 3-1
3.3 Entering Negative Numbers...................................................................................................3-1
3.4 Indexing Input Locations and Control Ports........................................................................... 3-1
3.5 Voltage Range and Overrange Detection.............................................................................. 3-2
3.6 Output Processing ................................................................................................................. 3-2
3.7 Use of Flags: Output and Program Control .......................................................................... 3-3
3.8 Program Control Logical Constructions................................................................................. 3-4
3.9 Instruction Memory and Execution Time ............................................................................... 3-5
3.10 Error Codes............................................................................................................................ 3-9
DATA RETRIEVAL/COMMUNICATION
4. EXTERNAL STORAGE PERIPHERALS
4.1 On-Line Data Transfer - Instruction 96.................................................................................. 4-1
4.2 Manually Initiated Data Output -
8
Mode ..................................................................... 4-3
4.3 Printer Output Formats .......................................................................................................... 4-3
4.4 Storage Module...................................................................................................................... 4-4
4.5
9
Mode -- SM192/716 Storage Module Commands.................................................... 4-6
5. TELECOMMUNICATIONS
5.1 Telecommunications Commands .......................................................................................... 5-1
5.2 Remote Programming of the CR23X..................................................................................... 5-6
6. 9-PIN SERIAL INPUT/OUTPUT
6.1 Computer RS-232 9-Pin Description ..................................................................................... 6-1
6.2 CS I/O 9-Pin Description........................................................................................................ 6-1
6.3 Use of Instruction 96.............................................................................................................. 6-9
PROGRAM EXAMPLES
7. MEASUREMENT PROGRAMMING EXAMPLES
7.1 Single-Ended Voltage/Switched 12 V Terminal - CS500....................................................... 7-1
7.2 Differential Voltage Measurement ......................................................................................... 7-3
7.3 Thermocouple Temperatures Using CR23X Reference........................................................ 7-3
7.4 Thermocouple Temperatures Using an External Reference Junction .................................. 7-3
7.5 107 Temperature Probe......................................................................................................... 7-4
7.6 Anemometer with Photochopper Output................................................................................ 7-4
7.7 Tipping Bucket Rain Gage with Long Leads ......................................................................... 7-5
7.8 100 ohm PRT in 4 Wire Half Bridge....................................................................................... 7-5
7.9 100 ohm PRT in 3 Wire Half Bridge....................................................................................... 7-6
7.10 100 ohm PRT in 4 Wire Full Bridge ....................................................................................... 7-7
7.11 Pressure Transducer - 4 Wire Full Bridge ............................................................................. 7-8
CR23X TABLE OF CONTENTS
iii
7.12 Lysimeter - 6 Wire Full Bridge ............................................................................................... 7-9
7.13 227 Gypsum Soil Moisture Block......................................................................................... 7-11
7.14 Nonlinear Thermistor in Half Bridge (Model 101 Probe) ..................................................... 7-12
7.15 Water Level - Geokon’s Vibrating Wire Pressure Sensor ................................................... 7-13
7.16 Paroscientific “T” Series Pressure Transducer.................................................................... 7-17
7.17 4 to 20 mA Sensor using CURS100 Terminal Input Module............................................... 7-20
8. PROCESSING AND PROGRAM CONTROL EXAMPLES
8.1 Computation of Running Average.......................................................................................... 8-1
8.2 Rainfall Intensity..................................................................................................................... 8-2
8.3 Using Control Ports and Loop to Run AM416 Multiplexer..................................................... 8-3
8.4 Sub 1 Minute Output Interval Synched to Real Time ............................................................ 8-5
8.5 Switch Closures on Control Ports (Rain Gage)..................................................................... 8-5
8.6 SDM-AO4 Analog Output Multiplexer to Strip Chart.............................................................. 8-6
8.7 Converting 0-360 Wind Direction Output to 0-540 for Strip Chart......................................... 8-7
8.8 Use of 2 Final Storage Areas - Saving Data Prior to Event................................................... 8-8
8.9 Logarithmic Sampling Using Loops....................................................................................... 8-9
8.10 Covariance Correlation Programming Example.................................................................. 8-11
8.11 Fast Fourier Transform Examples....................................................................................... 8-15
8.12 Using the Switched 12 V to Power Sensors........................................................................ 8-22
INSTRUCTIONS
9. INPUT/OUTPUT INSTRUCTIONS.................................................................................... 9-1
10. PROCESSING INSTRUCTIONS..................................................................................... 10-1
11. OUTPUT PROCESSING INSTRUCTIONS.................................................................. 11-1
12. PROGRAM CONTROL INSTRUCTIONS..................................................................... 12-1
MEASUREMENTS
13. CR23X MEASUREMENTS
13.1 Fast and Slow Measurement Sequence.............................................................................. 13-1
13.2 Single-Ended and Differential Voltage Measurements........................................................ 13-2
13.3 The Effect of Sensor Lead Length on the Signal Settling Time........................................... 13-4
13.4 Thermocouple Measurements........................................................................................... 13-14
13.5 Bridge Resistance Measurements..................................................................................... 13-20
13.6 Resistance Measurements Requiring AC Excitation......................................................... 13-24
13.7 Calibration Process............................................................................................................ 13-25
CR23X TABLE OF CONTENTS
iv
INSTALLATION
14. INSTALLATION AND MAINTENANCE
14.1 Protection from the Environment ......................................................................................... 14-1
14.2 Power Requirements ........................................................................................................... 14-2
14.3 CR23X Power Supplies ....................................................................................................... 14-4
14.4 Solar Panels......................................................................................................................... 14-5
14.5 Direct Battery Connection to the CR23X Wiring Panel........................................................ 14-6
14.6 Vehicle Power Supply Connections..................................................................................... 14-6
14.7 CR23X Grounding................................................................................................................ 14-7
14.8 Powering Sensors and Peripherals ..................................................................................... 14-9
14.9 Controlling Power to Sensors and Peripherals.................................................................. 14-10
14.10 Maintenance....................................................................................................................... 14-11
APPENDICES
A. GLOSSARY .............................................................................................................................A-1
B. CONTROL PORT SERIAL I/O INSTRUCTION 15
B.1 Specifications.........................................................................................................................B-1
B.2 Selected Operating Details....................................................................................................B-1
B.3 Instruction 15 and Parameter Descriptions ...........................................................................B-2
B.4 Control Port Configurations and Sensor Wiring.....................................................................B-5
B.5 RS232 Serial Data Configuration and Data Buffering ...........................................................B-7
B.6 Input Data Filters....................................................................................................................B-8
B.7 Program Examples ..............................................................................................................B-10
B.8 Summary of Barometer Jumper Configurations ..................................................................B-23
C. ADDITIONAL TELECOMMUNICATIONS INFORMATION
C.1 Telecommunications Command with Binary Responses ......................................................C-1
C.2 Final Storage Format.............................................................................................................C-4
C.3 Generation of Signature.........................................................................................................C-5
C.4 D Commands to Transfer Program with Computer .............................................................C-6
E. ASCII TABLE...........................................................................................................................E-1
F. DYNAGAGE SAP-FLOW (P67)
F.1 Function .................................................................................................................................F-1
F.2 Instruction Details ..................................................................................................................F-1
G. CALLBACK (CR23X INITIATED TELECOMMUNICATIONS)
G.1 Introduction ............................................................................................................................G-1
G.2 Developing a Callback Application ........................................................................................G-1
G.3 CR23X Programming.............................................................................................................G-3
CR23X TABLE OF CONTENTS
v
H. CALL ANOTHER DATALOGGER VIA PHONE OR RF
H.1 Introduction ............................................................................................................................H-1
H.2 Programming .........................................................................................................................H-1
H.3 Programming for the Calling CR23X .....................................................................................H-1
H.4 Remote Datalogger Programming.........................................................................................H-3
I. TD OPERATING SYSTEM ADDENDUM FOR CR510, CR10X, AND
CR23X MANUALS
INDEX......................................................................................................................................... INDEX-1
CR23X TABLE OF CONTENTS
vi
This is a blank page.
vii
SELECTED OPERATING DETAILS
1. Storing Data - Data are stored in Final
Storage only by Output Processing
Instructions and only when the Output Flag
(Flag 0) is set. (Sections OV4.1.1 and
3.7.1)
2. Storing Date and Time - Date and time are
stored with the data in Final Storage ONLY
if the Real Time Instruction 77 is used.
(Section 11)
3. Data Transfer - On-line data transfer from
Final Storage to peripherals (printer,
Storage Module, etc.) occurs only if enabled
with Instruction 96 in the datalogger
program. (Sections 4 and 12)
4. Final Storage Resolution - All Input
Storage values are displayed (
6
mode) as high resolution with a maximum
value of 99999. However, the default
resolution for data stored in Final Storage is
low resolution, maximum value of 6999.
Results exceeding 6999 are stored as 6999
unless Instruction 78 is used to store the
values in Final Storage as high resolution
values. (Sections 2.2.1 and 11)
5. Floating Point Format - The computations
performed in the CR23X use floating point
arithmetic. CSI's 4 byte floating point
numbers contain a 23 bit binary mantissa
and a 6 bit binary exponent. The largest
and smallest numbers that can be stored
and processed are 9 x 10
18
and 1 x 10
-19
,
respectively. (Section 2.2.2)
6. Erasing Final Storage - Data in Final
Storage can be erased without altering the
program by using the
A
Mode to
repartition memory. (Section 1.5.2)
7. ALL memory can be erased and the
CR23X completely reset by entering 98765
for the number of bytes allocated to
Program Memory. (
A
Window 5,
Section 1.5.2)
viii
CAUTIONARY NOTES
1. Damage will occur to the analog input
circuitry if voltages in excess of ±16 V are
applied for a sustained period. Voltages in
excess of ±8 V will cause errors and
possible overranging on other analog input
channels.
2. Do not download an operating system (OS)
written for a particular datalogger model into
the hardware of another datalogger model.
The datalogger will sustain damage and
must be returned to the factory for repair.
This is of concern only when updated
operating systems are purchased from
Campbell Scientific.
3. When using the CR23X with the
rechargeable battery option, remember that
the sealed lead acid batteries are
permanently damaged if deep discharged.
The cells are rated at a 7 Ahr capacity but
experience a slow discharge even in
storage. It is advisable to maintain a
continuous charge on the battery, whether
in operation or storage (Section 14).
4. When connecting external power to the
CR23X, first, remove the green power
connector from the CR23X panel. Then
insert the positive 12 V lead into the right-
most terminal of the green connector. Next,
insert the ground lead to the left terminal.
Double check polarity before plugging the
green connector into the panel.
5. Voltages in excess of 5 volts should not be
applied to a control port.
6. The CR23X contains desiccant to protect
against excess humidity. To reduce vapor
transfer into the ENC 12/14 or ENC 16/18
enclosure, plug the cable entry conduit with
Duct Seal, a putty-type sealant available at
most electrical supply houses. DO NOT
totally seal enclosures equipped with lead
acid batteries. Hydrogen concentration may
build up to explosive levels.
OV-1
CR23X MICROLOGGER OVERVIEW
Read the Selected Operating Details and Cautionary Notes at the front of the Manual before using the
CR23X.
The CR23X Micrologger combines precision measurement with processing and control capability in a
single battery operated system.
Campbell Scientific, Inc. provides three documents to aid in understanding and operating the CR23X:
1. This Overview
2. The CR23X Operator's Manual
3. The CR23X Prompt Sheet
This Overview introduces the concepts required to take advantage of the CR23X's capabilities. Hands-
on programming examples start in Section OV4. Working with a CR23X will help the learning process,
so don't just read the examples, turn on the CR23X and do them. If you want to start this minute, go
ahead and try the examples, then come back and read the rest of the Overview.
The sections of the Operator's Manual which should be read to complete a basic understanding of
the CR23X operation are the Programming Sections 1-3, the portions of the data retrieval Sections
4 and 5 appropriate to the method(s) you are using (see OV5), and Section 14 which covers
installation and maintenance.
Section 6 covers details of serial communications. Sections 7 and 8 contain programming
examples. Sections 9-12 have detailed descriptions of the programming instructions, and Section
13 goes into detail on the CR23X measurement procedures.
The Prompt Sheet is an abbreviated description of the programming instructions. Once familiar with the
CR23X, it is possible to program it using only the Prompt Sheet and on-line prompts as a reference,
consulting the manual if further detail is needed.
OV1. PHYSICAL DESCRIPTION
The CR23X Micrologger with the alkaline
batteries is shown in Figure OV1-1. It is
powered with 10 "D" cells and has only the
power switch on the base. The rechargeable
CR23X has rechargeable lead acid cells. In
addition to the power switch, it has a charger
input plug and an LED which lights when the
charging circuit is active. Rechargeable
CR23Xs should always be connected to a solar
panel or AC charger. The lead acid batteries
provide backup in event of a power failure but
are permanently damaged if their voltage drops
below 11.76 volts. Campbell Scientific does not
warrant batteries.
The 16 character keyboard is used to enter
programs, commands and data; these can be
viewed on the 24 character x 2 line LCD
display.
CR23X MICROLOGGER OVERVIEW
OV-2
1
2
3
A
4
5
6
B
7
8
9
C
*
0
#
D
FIGURE OV1-1. CR23X Micrologger
CR23X MICROLOGGER OVERVIEW
OV-3
HL
12
1
HL
34
2
HL
56
3
HL
78
4
HL
910
5
HL
11 12
6
DIFF
SE
HL
13 14
7
HL
15 16
8
HL
17 18
9
HL
19 20
40
HL
21 22
11
HL
23 24
12
DIFF
SE
EX1
EX2
EX3
EX4
CAO1
CAO2
P1
P2
P3
P4
G
5V
G
SW12
G
12V
12V
G
C1
C2
C3
C4
G
C5
C6
C7
C8
G
POWER OUT CONTROL I/O
GROUND
LUG
1 2 3 A
4 5 6 B
7 8 9 C
*
0 # D
MADE IN USA
SN:
CS I/O
COMPUTER
RS232
(OPTICALLY ISOLATED)
POWER IN
G 12V
CR23X MICROLOGGER
SDM
04:REF_TEMP
+21.93
FIGURE OV1-2. CR23X Panel and Associated Programming Instructions
External
12 Volt
Power Input
Switched
12 Volts
ANALOG INPUTS
Input/Output Instructions
1 Volt (SE)
2 Volt (DIFF)
4 Ex-Del-Se
5 AC Half Br
6 Full Br
7 3W Half Br
8 Ex-Del-Diff
9 6W Full Br
11 Temp (107)
12 RH-(207)
13 Temp-TC SE
14 Temp-TC DIFF
16 Temp-RTD
27 Interval-Freq.
28 Vibrating Wire Meas
29 INW Press
1
3
1 Enh
a
n
ced
Vi
b
. Wir
e
EXCITATION OUTPUTS
Input/Output Instructions
4 Ex-Del-Se
5 AC Half Br
6 Full Br
7 3W Half Br
8 Ex-Del-Diff
9 Full Br-Mex
11 Temp (107)
12 RH (207)
22 Del w/Opt Ext
28 Wire Meas
29 INW Press
Continuous
Analog Outputs
133 Analog
O
PULSE INPUTS
Input/Output Instructions
3 Pulse
DIGITAL I/O PORTS
Input/Output Instructions
3 Pulse
15 Serial I/O
20 Set Ports
21 Pulse Port
25 Read Ports
100-110, 118 SDM and SDI12
Instructions
134 AM25T
Program Control Instructions
83 If Case < F
86 Do
88 If X <=> Y
89 If X <=> F
91 If flag, port
92 If Time
Command Codes:
4X Set port x high
49 Switched 12 V on
5X Set port x low
59 Switched 12 V off
6X Toggle port x
7X Pulse port x
95 Port Subr.
96 Port Subr.
97 Port Subr.
98 Port Subr.
SERIAL I/O
Telecommunications
Program Control Instructions
96 Storage Module, Printer, Serial Out
97 Initiate Telecommunications
120 TGT1 GOES Satellite (CS I/O only)
121 ARGOS Satellite (CS I/O only)
122 INMARSAT-C Satellite (CS I/O only)
123 TGT1 Programming
Power Ground (G), for
5V
SW-12
12V
Control I/O
Earth Ground
Connect 12ga
or larger wire to
earth ground
Signal Ground ( ), for
Analog
Pulse
Excitation
Sensor Shields
CR23X MICROLOGGER OVERVIEW
OV-4
The 9-pin serial CS I/O port provides
connection to data storage peripherals, such as
the SM192/716 Storage Module, and provides
serial communication to computer or modem
devices for data transfer or remote
programming (Section 6). This 9 pin port does
NOT have the same pin configuration as the 9
pin serial ports currently used on most personal
computers. An SC32A is required to interface
the CS I/O port to a PC or other RS-232 serial
port (Section 6). An optically isolated computer
RS-232 port is also provided for direct
connection to PCs and other RS-232 devices.
The panel contains four terminal strips which
are used for sensor inputs, excitation, control
input/outputs, etc. Figure OV1-2 shows the
CR23X panel and the associated programming
instructions.
OV1.1 WIRING TERMINALS
Wiring terminals are provided on the CR23X to
allow connection of external sensors and other
devices.
OV1.1.1 ANALOG INPUTS
The terminals labeled 1H to 12L are analog
voltage inputs. These numbers (black) refer to
the high and low inputs to the differential
channels 1 through 12. In a differential
measurement, the voltage on the H input is
measured with respect to the voltage on the L
input. When making single-ended
measurements, either the H or L input may be
used as an independent channel to measure
voltage with respect to the CR23X analog
ground (
). The single-ended channels are
numbered sequentially starting with 1H (blue);
e.g., the H and L sides of differential channel 1
are single-ended channels 1 and 2; the H and L
sides of differential channel 2 are single-ended
channels 3 and 4, etc.
The analog input terminal strips have an
insulated cover to reduce temperature
gradients across the input terminals. The cover
is required for accurate thermocouple
measurements (Section 13.4).
OV1.1.2 EXCITATION OUTPUTS
The terminals labeled EX1, EX2, EX3, and EX4
are precision, switched excitation outputs used
to supply programmable excitation voltages for
resistive bridge measurements. DC or AC
excitation at voltages between -5000 mV and
+5000 mV are user programmable (Section 9).
OV1.1.3 CONTINUOUS ANALOG OUTPUTS (CAO)
Two CAO channels supply continuous output
voltages under program control, for use with strip
charts, x-y plotters, or proportional controllers.
OV1.1.4 PULSE INPUTS
The terminals labeled P1, P2, P3, and P4 are
the pulse counter inputs for the CR23X. They
are programmable for high frequency pulse, low
level AC, or switch closure (Section 9,
Instruction 3).
OV1.1.5 DIGITAL I/O PORTS
Terminals C1 through C8 are digital
Input/Output ports. On power-up they are
configured as input ports, commonly used for
reading the status of an external signal. High
and low conditions are: 3 V < high < 5.5 V; -
0.5 V < low < 0.8 V.
Configured as outputs the ports allow on/off
control of external devices. A port can be set
high (5 V ± 0.1 V), low (<0.1 V), toggled or
pulsed (Sections 3, 8.3, and 12).
Ports C5 through C8 can be configured as
pulse counters for switch closures (Section 9,
Instruction 3) or used to trigger subroutine
execution (Section 1.1.2).
Built in Zener diodes on the eight control ports
limit input voltage to acceptable levels of < =
5.6 VDC. Do not apply voltages greater than
16 VDC. A voltage of 5.0 VDC is preferred.
OV1.1.6 GROUNDS
The CR23X has ground terminals marked
and G. Signal returns of analog inputs and
their associated shields along with excitation
voltage returns are to be tied to the
terminals
located in the analog input terminal strips. The
G terminals (Power Grounds) are intended to
carry return currents from the 5 V, SW12, 12 V,
and C1-C8 outputs. Tying these potentially
large return currents to G terminals keeps these
currents from flowing through and corrupting
analog measurements. Offset voltage errors in
single-ended measurements can occur for
large (50 mA) currents flowing into the
terminals in the analog input terminal strips.
CR23X MICROLOGGER OVERVIEW
OV-5
Return currents from the CAO and pulse-
counter channels should be tied to the
terminals in the CAO and pulse-counter
terminal strip to prevent them from flowing
through the analog measurement section.
The ground lug is also marked
and provides
a rugged ground path from the individual
and
G terminals to earth or chassis ground for ESD
protection.
Review Section 14.7 for complete grounding
recommendations.
OV1.1.8 5V OUTPUTS
The 5 V (±4.0%) output is commonly used to
power peripherals such as the QD1 Incremental
Encoder Interface, AVW1 or AVW4 Vibrating
Wire Interface.
The 5 V output is common with pin 1 on the CS
I/O 9 pin connector; 200 mA is the maximum
combined output.
OV1.1.9 CS I/O
The 9 pin CS I/O port contains lines for serial
communication between the CR23X and
external devices such as computers, printers,
Campbell modems, Storage Modules, etc. This
port does NOT have the same configuration
as the 9 pin serial ports currently used on
most personal computers. It has a 5 VDC
power line which is used to power peripherals
such as Storage Modules. The same 5 VDC
supply is used for the 5 V output on the lower
right terminal strip. It has a 12 VDC power line
used to power other peripherals such as the
COM200 phone modem. Section 6 contains
technical details on serial communication.
OV1.1.10 COMPUTER RS-232 PORT
This port is an optically isolated standard 9 pin
RS-232 DCE/DTE port. It can be connected
directly to the serial port of most personal
computers. A 6 foot 9 to 9 pin serial cable and a
9 to 25 pin adapter are included with the CR23X
to connect this port to a PC serial port.
OV1.1.11 SWITCHED 12 VOLT
The switched 12 volt output can be used to
power sensors or devices requiring an
unregulated 12 volts. The output is limited to
600 mA at 50°C (360 mA at 80°C) current. The
switched 12 volt port is addressed as “Port 9” in
a datalogger program.
When the port is set high, the 12 volts is turned
on; when the port is low, the switched 12 volts is
off (Section 8.12).
OV1.2 CONNECTING POWER TO THE CR23X
The CR23X should be powered by any clean,
battery backed 12 VDC source. The green
power connector on the wiring panel is a plug in
connector that allows the power supply to be
easily disconnected. The power connection is
reverse polarity protected. The datalogger
should be earth or chassis ground during
routine operation. See Section 14 for details on
power supply connections and grounding.
When primary power falls below 11.0 VDC, the
CR23X stops executing its programs. The Low
Voltage Counter (B window 9) is incremented
by one each time the primary power falls below
11.0 VDC and E10 is displayed. A double dash
(--) in the 9th window of the B mode indicates
that the CR23X is currently in a low primary
power mode. (Section 1.6)
The datalogger program and stored data
remain in memory, and the clock continues to
keep time when power is disconnected. The
clock and SRAM are powered by an internal
lithium battery. (Section 14.11.2)
OV2. MEMORY AND PROGRAMMING
CONCEPTS
OV2.1 INTERNAL MEMORY
The standard CR23X has 512 Kilobytes of
Flash Electrically Erasable Programmable
Read Only Memory (EEPROM), 128 Kilobytes
Static Random Access Memory (SRAM), and 1
Megabyte of Flash RAM. As an option, the
CR23X can be purchased with 4 Megabyte
Flash for final storage. Operating system
EEPROM stores the operating system, user
programs, and labels. SRAM is used for final
storage data and running the user program.
Final Storage Flash is used for data storage.
The use of the Input, Intermediate, and Final
Storage in the measurement and data
processing sequence is shown in Figure
OV2.1-2. The five areas of SRAM are:
CR23X MICROLOGGER OVERVIEW
OV-6
1. System Memory - used for overhead tasks
such as compiling programs, transferring
data, etc. The user cannot access this
memory.
2. Active Program Memory - available for
user entered programs.
3. Input Storage - Input Storage holds the
results of measurements or calculations.
The
6
Mode is used to view Input
Storage locations for checking current
sensor readings or calculated values. Input
Storage defaults to 64 locations. Additional
locations can be assigned using the
A
Mode.
4. Intermediate Storage - Certain Processing
Instructions and most of the Output
Processing Instructions maintain
intermediate results in Intermediate
Storage. Intermediate storage is
automatically accessed by the instructions
and cannot be accessed by the user. The
default allocation is 64 locations. The
number of locations can be changed using
the
A
Mode.
5. Final Storage - Final processed values are
stored here for transfer to printer, solid
state Storage Module or for retrieval via
telecommunication links. Values are stored
in Final Storage only by the Output
Processing Instructions and only when the
Output Flag is set in the user’s program.
Approximately 570,000 locations are
allocated to Final Storage from SRAM on
power up. This number is reduced if Input
or Intermediate Storage is increased.
While the total size of these three areas
remains constant, memory may be
reallocated between the areas to
accommodate different measurement and
processing needs (
A
Mode, Section
1.5).
6. Alphanumeric Labels - The CR23X can
be programmed through EDLOG (PC208W
software) to assign alphanumeric labels to
Input Storage and Final Storage locations.
Labels must consist of letters, numbers, or
the underscore ( _ ), and must not begin
with a number.
CR23X MICROLOGGER OVERVIEW
OV-7
Operating System
(128 Kbytes)
Active Program
(32 Kbytes Code)
Stored Programs
(32 Kbytes Code)
(32 Kbytes Labels)
Temporary Copy of
Current Program
Saved during
download if download
is aborted
(64 Kbytes)
Alphanumeric Labels
(32 Kbytes)
Unassigned
(192 Kbytes)
SRAM/FLASH
Total 1152 Kbytes
Flash Memory
(EEPROM)
Total 512 Kbytes
How it works:
The
Operating System
is loaded into
Flash Memory at the factory.
System
Memory
is used while the CR23X is
running for calculations, buffering data
and general operating tasks.
A
ny time a user loads a program into
the CR23X, the program is compiled in
SRAM and stored in the
Active
Program
areas. If the CR23X is
powered off and then on, the Active
Program is loaded from Flash and run.
The Active Program is run in SRAM to
maximize speed. The program
accesses
Input Storage
and
Intermediate Storage
and stores data
into
Final Storage
for later retrieval by
the user.
The Active Program can be copied into
the
Stored Programs
area. While 98
program "names" are available, the
number of programs stored is limited
by the available memory. Stored
programs can be retrieved to become
the active program. While programs
are stored one at a time, all stored
programs are erased simultaneously.
That is because the flash memory can
only be written to once before it must
be erased and can only be erased in 16
Kbytes blocks.
(Memory Areas separated by dashed
lines:
can be re-sized by the user.)
1 byte per character stored. 9 bytes
per input location label. All final
storage label characters plus 2 bytes
per table name (array ID name) and
field name.
Memory available only to
system
Memory shared between
Program, Input Storage,
and Intermediate Storage
Memory allocable to Final
Storage 1 and 2 only
Memory available only to
Final Storage area 1
32K SRAM
System Memory
4096 Bytes
Active Program
Default
2048 Bytes
Input Storage
Default
112 Bytes
28 Locations
Intermediate Storage
Default
256 Bytes
64 Locations
96K SRAM
Final Storage 1 and 2
98,304 Bytes
49,154 Locations
1M FLASH
Final Storage 1 and 2
917,504 Bytes
458,752 Locations
or
4M FLASH
Final Storage 1 and 2
4,292,610 Bytes
2,146,305 Locations
Final Storage 1 Only
131,072 Bytes
65,536 Locations
FIGURE OV2.1-1. CR23X Memory
CR23X MICROLOGGER OVERVIEW
OV-8
OV2.2 PROGRAM TABLES, EXECUTION
INTERVAL AND OUTPUT INTERVALS
The CR23X must be programmed before it will
make any measurements. A program consists
of a group of instructions entered into a
program table. The program table is given an
execution interval which determines how
frequently that table is executed. When the
table is executed, the instructions are executed
in sequence from beginning to end. After
executing the table, the CR23X waits the
remainder of the execution interval and then
executes the table again starting at the
beginning.
The interval at which the table is executed
generally determines the interval at which the
sensors are measured. The interval at which
data are stored is separate from how often the
table is executed, and may range from samples
every execution interval to processed
summaries output hourly, daily, or on longer or
irregular intervals.
Programs are entered in Tables 1 and 2.
Subroutines, called from Tables 1 and 2, are
entered in Subroutine Table 3. The size of
program memory can be fixed or automatically
allocated by the CR23X (Section 1.5).
Table 1 and Table 2 have independent
execution intervals, entered in units of seconds
with an allowable range of 1/100 to 6553.5
seconds. Subroutine Table 3 has no execution
interval, since it is called from Table 1, Table 2,
or an interrupt subroutine.
OV2.2.1 THE EXECUTION INTERVAL
The execution interval specifies how often the
program in the table is executed, which is
usually determined by how often the sensors
are to be measured. Unless two different
measurement rates are needed, use only one
table. A program table is executed sequentially
starting with the first instruction in the table and
proceeding to the end of the table.
Table 1.
Execute every x sec.
0.01 < x < 6553.5
Instructions are executed
sequentially in the order they
are entered in the table.
One complete pass through
the table is made each
execution interval unless
program control instructions
are used to loop or branch
execution.
Normal Order:
MEASURE
PROCESS
CHECK OUTPUT COND.
OUTPUT PROCESSING
Table 2.
Execute every y sec.
0.01 < y < 6553.5
Table 2 is used if there is a
need to measure and
process data on a separate
interval from that in Table 1.
Table 3.
Subroutines
A subroutine is executed
only when called from Table
1 or 2.
Subroutine Label
Instructions
End
Subroutine Label
Instructions
End
Subroutine Label
Instructions
End
FIGURE OV2.2-1. Program and Subroutine Tables
CR23X MICROLOGGER OVERVIEW
OV-9
Each instruction in the table requires a finite
time to execute. If the execution interval is less
than the time required to process the table, an
execution interval overrun (table overrun)
occurs; the CR23X finishes processing the
table and waits for the next execution interval
before initiating the table. When a table
overrun occurs,
T
o
appears in the lower right
corner of the display in the Running Table
mode
(
0
). Overruns and table priority are
discussed in Section 1.1.
OV2.2.2. THE OUTPUT INTERVAL
The interval at which output occurs must be an
integer multiple of the execution interval (e.g., a
table cannot have a 10 minute execution
interval and output every 15 minutes).
A single program table can have many different
output intervals and conditions, each with a
unique data set (Output Array). Program
Control Instructions are used to set the Output
Flag. The Output Processing Instructions
which follow the instruction setting the Output
Flag determine the data output and its
sequence. Each additional Output Array is
created by another Program Control Instruction
checking a output condition, followed by Output
Processing Instructions defining the data set to
output.
OV2.3 CR23X INSTRUCTION TYPES
Figure OV2.3-1 illustrates the use of three
different instruction types which act on data.
The fourth type, Program Control, is used to
control output times and vary program
execution. Instructions are identified by
numbers.
1. INPUT/OUTPUT INSTRUCTIONS (1-29,
100-110, 113-118, 130-134; Section 9)
control the terminal strip inputs and outputs
(Figure OV1.1-2), storing the results in
Input Storage (destination). Multiplier and
offset parameters allow conversion of linear
signals into engineering units. The Digital
I/O Ports and CAO analog output ports are
also addressed with I/O Instructions.
2. PROCESSING INSTRUCTIONS (30-68,
Section 10) perform numerical operations
on values located in Input Storage and
store the results back in Input Storage.
These instructions can be used to develop
high level algorithms to process
measurements prior to Output Processing.
3. OUTPUT PROCESSING INSTRUCTIONS
(69-82, Section 11) are the only
instructions which store data in Final
Storage. Input Storage values are
processed over time to obtain averages,
maxima, minima, etc. There are two types
of processing done by Output Instructions:
Intermediate and Final.
Intermediate processing normally takes
place each time the instruction is executed.
For example, when the Average Instruction
is executed, it adds the values from the
input locations being averaged to running
totals in Intermediate Storage. It also keeps
track of the number of samples.
Final processing occurs only when the
Output Flag is high (Section 3.7.1). The
Output Processing Instructions check the
Output Flag. If the flag is high, final values
are calculated and output. With the
Average, the totals are divided by the
number of samples and the resulting
averages sent to Final Storage.
Intermediate locations are zeroed and the
process starts over. The Output Flag, Flag
0, is set high by a Program Control
Instruction which must precede the Output
Processing Instructions in the user entered
program.
4. PROGRAM CONTROL INSTRUCTIONS
(83-98, 111, 120-123, 220; Section 12) are
used for logic decisions, conditional
statements, and to send data to peripherals.
They can set flags and ports, compare
values or times, execute loops, call
subroutines, conditionally execute portions
of the program, etc.
CR23X MICROLOGGER OVERVIEW
OV-10
INPUT/OUTPUT
INSTRUCTIONS
Specify the conversion of a sensor signal
to a data value and store it in Input
Storage. Programmable entries specify:
(1) the measurement type
(2) the number of channels to measure
(3) the input voltage range
(4) the Input Storage Location
(5) the sensor calibration constants
used to convert the sensor output to
engineering units
I/O Instructions also control analog
outputs and digital control ports.
INPUT STORAGE
Holds the results of measurements or
calculations in user specified locations.
The value in a location is written over
each time a new measurement or
calculation stores data to the locations.
OUTPUT PROCESSING
INSTRUCTIONS
Perform calculations over time on the
values updated in Input Storage.
Summaries for Final Storage are
generated when a Program Control
Instruction sets the Output Flag in
response to time or events. Results
may be redirected to Input Storage for
further processing. Examples include
sums, averages, max/min, standard
deviation, histograms, etc.
Output Flag set high
FINAL STORAGE
Final results from OUTPUT
PROCESSING INSTRUCTIONS are
stored here for on-line or interrogated
transfer to external devices (Figure
OV5.1-1). When memory is full, new
data overwrites the oldest data.
PROCESSING INSTRUCTIONS
Perform calculations with values in Input
Storage. Results are returned to Input
Storage. Arithmetic, transcendental and
polynomial functions are included.
INTERMEDIATE STORAGE
Provides temporary storage for intermediate
calculations required by the OUTPUT
PROCESSING INSTRUCTIONS; for
example, sums, cross products,
comparative values, etc.
FIGURE OV2.3-1. Instruction Types and Storage Areas
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Campbell Scientific CR23X Owner's manual

Category
Measuring, testing & control
Type
Owner's manual

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