Paroscientific, Inc. Technical Note
Precision Pressure Instrumentation Doc. No. G8044 25 March 2005
©2005 Paroscientific, Inc.
5
Figure 2. CR1000 COM1 Data and Electrical Connection
Connect the RS-232 TX and RX wires first. Make sure that the TX wire from the sensor is connected to RX
port of COM1 and RX wire to TX port. Connect ground wire to G and power wire to 12V terminal on the
CR1000. Tighten the screws and make sure that there is contact between the sensor RS-232, power and
ground wires and the screws on each port.
4.3 Program the data logger to acquire data from Digiquartz® Intelligent Instrument
A program must be provided for the data logger in order to make measurements and store data. The CR1000 data
logger has a total memory of 2 MB. Approximately 1400 Kbytes of memory is available for data table storage.
Additional storage space can be provided by using an optional compact flash card. The memory has battery back
up. When power is lost or the data logger is powered down, programs and data remain in memory. If power is lost,
an active program will start running again when the power is back.
Stored data is maintained in table format. In addition to data tables, there are public and status tables. The public
table holds variables and the status table holds variables that define logger status. Each data table has its own file.
Tables are erased when program is loaded and run.
The number and size of data tables is defined by the
individual CR1000 program. Numerous data tables can be used to store different data on different intervals. The
CR1000 can “auto allocate” its tables; so, the newest data begins to overwrite the oldest data at approximately the
same time. There is a field in the Status Table that indicates how long it will take before the oldest data in the table
is overwritten by the newest data.
There are several ways to program the CR1000. The simplest way is to use Campbell Scientific’s software called
ShortCut. For more complex programming, the CRBasic editor can be used.
Figure 3. LoggerNet Software Interface
(17 pages)
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