R2 Data Logger

Overview | R2 User Interface | Sample R2 Data Logger Applications | Hardware Specifications

Overview:

The R2 logger has been designed to provide a rugged low cost versatile data logger which can be configured and operated with a minimum of effort on the part of the user. The logger is capable of long term unattended operation in harsh environments with very small battery requirements. The RS232 communication interface supports common modems, laptops and handhelds. The user is free to use the supplied communication software or their own preferred communication and spreadsheet software.

Example sensor types:
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R2 User Interface:

You may communicate with the R2 Remote Data Logger using any standard serial port on a MS-DOS or Windows TM compatible computer. The normal site visit is accomplished with three or four short commands. The quick dialog provides a complete report of the logger status and data. The data is immediately available for viewing or spreadsheet work.


R2 Data Logger Menu Options: 
STORMY CREEK STATION #1035  03/03/97 16:40:00
--- Available Commands : 
 STATUS    Display status of logger
 JOURN     Print journal, battery log
 DUMP      Printout accumulated data
 START     Start logging operation
 STOP      Stop logging operation
 PURGE     Erase old data
 SCAN      Read sensors
 TIME      Set real time clock
 BYE       Force logger to go to sleep
ESC to exit. MORE for more cmds

 Enter Command : more
..More commands
 CONFIG    Download new configuration
 COMM      Set baud rate, password
 CALIB     Calibration
 DIAG      Version & Misc for programmer
Commands may be shortened. Ctl-S to pause
Ctl-C restarts program (like power up).

Example of Data Retrieval: 
 Enter Command : status

STORMY CREEK  #1035 at 03/03/97 15:36:47
Battery  12.4V   Logging is ACTIVE  CIRCULAR
Memory left 82%  ( 46.9 days)
Used 5760 bytes   Using 576/day
Started 02/22/97 16:36:40
Record interval 1800 secs ( 30.0 min)
  Scan interval   10 secs ( 0.2 min)
Next scan 03/03/97 15:37:10   Last 03/03/97 15:36:40

 Enter Command : dump
Enter number of most recent records
to dump (default is all) : 4

                       AIR     WIND     UNIT
                      TEMP    SPEED   VECTOR  SIGMA D
                     DEG C      MPH   DEG AZ   DEG AZ
                       AVG      MAX     INST     INST
03/03/97 15:51:40     15.3      5.4      273     10.6
03/03/97 16:06:40     16.4      8.1      187     20.5
03/03/97 16:21:40     13.2      8.0      260     12.8
03/03/97 16:36:40     13.0      3.4      266     10.4

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Sample R2 Data Logger Applications:

Prudhoe Bay Mountain Village Toklat River Fairbanks Healy Anchorage Whittier Juneau Ketchikan Lower '48' Cold Bay


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HARDWARE SPECIFICATIONS

GENERAL
  • Configuration and data retrieval performed on small MS-DOS computers. Uses prepackaged sensor definitions
  • Real time clock with leap years (±3 min/month)
  • Computer Interface: Standard 9 pin RS232 connection 1200 to 9600 baud, 8 bit, no parity, simple ASCII text
  • External Bus: 15 pin connector for additional channels, memory modules, communication methods, signal triggering, digital I/O, auxiliary power packs, and other features
  • Data Memory: 32k bytes of Static RAM Max 32,768 readings. Usually 5,000-10,000 readings.

PHYSICAL
  • Size: 3.1" x 4.7" x 2.2" (80 mm x 120 mm x 56 mm)
  • Weight: 15 oz. (420 g.) with 9V batteries
  • Operating Temperature: -30°C to +50°C
    (-55°C to +60°C with less accuracy)

POWER REQUIREMENTS
  • Internal lithium (10 year memory retention)
  • Internal parallel 9V alkaline or lithium cells (2)
  • External 8V-15VDC unregulated
  • Quiescent Current: 25µA (35µA with external power)
  • Active Current: 20mA excluding sensors
  • Internal 9V alkaline batteries can often operate the logger for 6-12 months

EXCITATION OUTPUT
  • +5V ±.005V reference quality, 50ma maximum
ANALOG VOLTAGE INPUTS
  • 4 singled-ended or 2 differential channels plus two additional channels on external connector
  • Full Scale Ranges:
    Single Ended and Differential:
    ±10mV, ±100mV, ±1V, ±50mV, ±500mV, ±5V
    Hi-res single end: 0 to +20mV, +200mV, +2V
    Common Mode Range: ±3.75V
  • Sample Integration Time: 1.1 ms to 16.6 ms
  • Sample Recording Rate: 1 second to 1 day
  • Accuracy: 0.1% full scale range plus 150µV (16 ms integration)
  • Resolution: Depends on scale and integration time. Best resolution is 0.012% of full scale
  • Signal Input Impedance 10M W minimum (active)

FREQUENCY INPUT CHANNEL
  • Low voltage AC sine wave or DC pulses
  • Voltage Input:
    Maximum: 15 V peak to peak
    Minimum: 100mV p-p (35mV RMS)
  • Hysteresis: 20mV max.
  • Minimum Pulse Width: 15 µsec
  • Maximum Input Frequency: 5 kHz to 60 kHz (depending on input signal voltages)
  • Accuracy: 50 ppm

EVENT COUNTER (switch closure devices)
  • Normally open or normally closed
  • Nominal 5 ms minimum open or close time


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Dryden Instrumentation
5401 Cordova St., #101
Anchorage, Alaska 99518-1271
(907) 344-4995
fax: (907) 344-8013
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