Campbell CR510 User Guide
CR510 DATALOGGER
OPERATOR'S MANUAL
9/01
COPYRIGHT (c) 1986-2001 CAMPBELL SCIENTIFIC, INC.
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CR510 DATALOGGER OVERVIEW
The CR510 is a fully programmable datalogger/controller with non-volatile memory and a battery backed
clock in a small, rugged module. The combination of reliability, versatility, and telecommunications
support make it a favorite choice for networks and single logger applications.
Campbell Scientific Inc. provides four aids to operating the CR510:
1. This Overview
2. The CR510 Operator's Manual
3. The CR510 Prompt Sheet
4. Short Cut
This Overview introduces the concepts required to take advantage of the CR510's capabilities. Handson programming examples start in Section OV5. Working with a CR510 will help the learning process,
so don't just read the examples, 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
CR510 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 OV6), 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 each programming instruction, and Section 13 goes into
detail on the CR510 measurement procedures.
The Prompt Sheet is an abbreviated description of the programming instructions. Once familiar with the
CR510, it is possible to program it using only the Prompt Sheet as a reference, consulting the manual if
further detail is needed.
Short Cut is an easy-to-use DOS-based software program. It features point-and-click menus to guide
you through the process of creating simple CR510 programs. In addition to the downloadable program
file, Short Cut creates a table to simplify wiring sensors to the CR510.
Read the Selected Operating Details and Cautionary Notes at the front of the Manual before using the
CR510.
OV1. PHYSICAL DESCRIPTION
The CR510 was designed to provide a rugged
datalogger with a low per unit cost. Some of its
distinguishing physical features are:
• The CR510 does not have an integral
keyboard/display. The user accesses the
CR510 with the portable CR10KD Keyboard
Display or with a computer or terminal
(Section OV2).
• The power supply is external to the CR510.
This gives the user a wide range of options
(Section 14) for powering the CR510.
OV1.1 ANALOG INPUTS
The terminals labeled 1H to 4L are analog
inputs. These numbers refer to the high and
low inputs to the differential channels 1 and 2.
In a differential measurement, the voltage on
the H input is measured with respect to the
voltage on the L input. When making singleended measurements, either the H or L input
may be used as an independent channel to
measure voltage with respect to the CR510
analog ground (AG). The single-ended
channels are numbered sequentially starting
with 1H; 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.
OV-1
CR510 OVERVIEW
OV1.2 EXCITATION OUTPUTS
The terminals labeled E1, and E2 are precision,
switched excitation outputs used to supply
programmable excitation voltages for resistive
bridge measurements. DC or AC excitation
voltages between -2500 mV and +2500 mV are
user programmable (Section 9).
OV1.3 PULSE INPUTS
The terminals labeled P1, P2, and P3 are the
pulse counter inputs for the CR510. P1 and P2
are programmable for high frequency pulse, low
level AC, or switch closure (Section 9,
Instruction 3). C2/P3 can be configured to
count switch closures up to 40 Hz.
OV1.4 DIGITAL I/O PORTS
Terminal C1 is a digital Input/Output port. On
power-up it is configured as an input port,
commonly used for reading the status of an
external signal. High and low conditions are:
3V < high < 5.5V; -0.5V < low < 0.8V.
Configured as output the port allows on/off
control of external devices. A port can be set
high (5V ± 0.1V), set low (<0.1V), toggled or
pulsed (Sections 3, 8.3, and 12).
Port C2/P3 can be configured as pulse counters
for switch closures (Section 9, Instruction 3) or
used to trigger subroutine execution (Section
1.1.2), or serial SDI-12 communication.
OV1.5 ANALOG GROUND (AG)
OV1.7 5V OUTPUT
The 5V (±0.2%) output is commonly used to
power peripherals such as the QD1 Incremental
Encoder Interface and AVW1 Vibrating Wire
Interface.
The 5V output is common with pin 1 on the 9
pin serial connector; 200 mA is the maximum
combined current output.
OV1.8 SERIAL I/O
The 9 pin serial I/O port contains lines for serial
communication between the CR510 and external
devices such as computers, printers, Storage
Modules, etc. This port does NOT have the
same configuration as the 9 pin serial ports
currently used on many personal computers.
It has a 5VDC power line which is used to power
peripherals such as the Storage Modules. The
same 5VDC supply is used for the 5V output on
the terminal strip. It also has a continuous 12 V
power supply on pin 8 for external
communication devices such as the COM200
and COM300. Section 6 contains technical
details on serial communication.
OV1.9 CONNECTING POWER TO THE CR510
The CR510 can be powered by any 12VDC
source. The green power connector is a plug in
connector that allows the power supply to be
easily disconnected without unscrewing the
terminals. The Terminal Strip power connection
is reverse polarity protected. See Section 14 for
details on power supply connections.
The AG terminals are analog grounds, used as
the reference for single-ended measurements
and excitation return.
OV1.6 12V, POWER GROUND (G), AND EARTH
TERMINALS
The 12V and power ground (G) terminals are
used to supply 12V DC power to the datalogger.
The extra 12V and G terminals can be used to
connect other devices requiring 12V power.
The G terminals are also used to tie cable
shields to ground, and to provide a ground
reference for pulse counters and binary inputs.
The G terminals are directly connected to the
Earth terminal. For protection against transient
voltage spikes, Earth Ground should be
connected to a good earth ground (Section
14.7.1).
OV-2
CAUTION: The metal surfaces of the
CR510 Terminal Strip, and CR10KD
Keyboard Display are at the same potential
as power ground. To avoid shorting 12
volts to ground, connect the 12 volt lead
first, then connect the ground lead.
When primary power falls below 9.6 VDC, the
CR510 stops executing its programs. The Low
Voltage Counter (∗B window 9) is incremented
by one each time the primary power falls below
9.6 VDC and E10 is displayed on the CR10KD.
A double dash (--) in the 9th window of the ∗B
mode indicates that the CR510 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
CR510 OVERVIEW
time when power is disconnected. The clock
and Static Random Access Memory (SRAM)
are powered by an internal lithium battery.
OV2. MEMORY AND PROGRAMMING
CONCEPTS
OV2.1 INTERNAL MEMORY
The standard CR510 has 128 K of Flash
Electrically Erasable Programmable Read Only
Memory (EEPROM) and 128 K Static Random
Access Memory (SRAM). The Flash EEPROM
stores the operating system and user programs.
RAM is used for data and running the program.
Data Storage can be expanded with an optional
Flash EEPROM (Figure OV2.1-1). 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:
1. System Memory - used for overhead tasks
such as compiling programs, transferring
data, etc. The user cannot access this
memory.
2. 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 28 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 62,000 locations are
allocated to Final Storage on power up.
This number is reduced if Input or
Intermediate Storage is increased.
While the total size of these areas remains
constant, memory may be reallocated between
the areas to accommodate different
measurement and processing needs (∗A Mode,
Section 1.5).
OV-3
CR510 OVERVIEW
Flash Memory
(EEPROM)
Total 128 Kbytes
Operating System
(96 Kbytes)
Active Program
(16 Kbytes)
Stored Programs
(16 Kbytes)
How it works:
The Operating System is loaded into
Flash Memory at the factory. System
Memory is used while the CR510 is
running calculations, buffering data and
for general operating tasks.
Any time a user loads a program into
the CR510, the program is compiled in
SRAM and stored in the Active
Program areas. If the CR510 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 must be erased at once. 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.
SRAM
Total 128 Kbytes
System Memory
(4096 Bytes)
Active Program
(default 2048 Bytes)
Input Storage
(default 28 locations,
112 bytes)
Intermediate Storage
(default 64 locations,
256 bytes)
Final Storage Area 1
(default 62,280
locations, 124,560
bytes)
Final Storage Area 2
(default 0 locations,
0 bytes)
Optional
Flash EEPROM
OV-4
With the Optional Flash Memory, up to
2 Mbytes of additional memory can be
added to increase Final Storage by
another 524,288 data values per
Mbyte. The user can allocate this extra
memory to any combination of Area 1
or Area 2.
(Memory Areas separated by dashed
lines:
can be re-sized by the user.)
FIGURE OV2.1-1. CR510 Memory
Final Storage Area 1
and/or
Final Storage Area 2
(Additional 524,288
locations per Mbyte)
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