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1. INTRODUCTION
The Model LC-2x16 16 Channel Datalogger is a low cost, battery powered and easy to use
measurement instrument designed to read up to 16 vibrating wire sensors equipped with
thermistors.
The 320K standard memory provides storage for 3555 data arrays. Each array consists of an
optional datalogger ID string (16 characters maximum), a timestamp consisting of the year, date
(Julian day or month/day format), time (hhmm or hours/minutes format) and seconds when the
reading was taken. Also included in the data is the internal 3V (or external 12V) battery voltage,
the datalogger temperature, the vibrating wire readings, the transducer temperature and the Array
number.
Internal math is calculated using 32 bit floating point notation (IEEE). Math operations on the
instrument readings, such as application of zero readings, gage factors (or calibration factors)
and offsets when using a linear conversion technique or polynomial coefficients when using the
polynomial conversion, provide outputs directly in engineering units. The dataloggers internal
configuration is defined through communication with a computer using the supplied RS-232 or
USB (or optional RS-485) interface cable. The datalogger is configured and monitored using
LogView, a Geokon proprietary Graphic User Interface (GUI) software application (See Section
2.3).The datalogger can also be configured and monitored via text-based commands with any
standard terminal emulator software, such as Microsoft Windows HyperTerminal
™
(see Section
3, Command Set ).
The following three communications options are available for the LC-2x16:
LC-2x16 Model #
Communication
8002-16-1
RS-232
8002-16-2
USB
8002-16-3
RS-485
8002-16-1: Communication
with
the LC-2x16 is implemented via the host computer’s RS-
232 COM port. See Section 2.3.6 for further information.
8002-16-2: Communication
with
the LC-2x16 is implemented via the host computer’s USB
2.0 port. When connected to a computer via the USB port, the LC-2x16 appears to
the computer as a “virtual” COM port. The LC-2x16 datalogger also receives all
of its operating power from the computer, thus extending the internal 3V (or
external 12V) battery life. When disconnected from the USB port, the datalogger
automatically switches to the internal 3V (or external 12V) battery pack. See
Section 2.3.7 for further information.
8002-16-3: Communication
with
the LC-2x16 is implemented via RS-485. This allows for
long communication cables (up to 4000’) between the host computer and the LC-
2x16. The ability to network two or more LC-2x16 dataloggers together is also
available with this communication option. See Section 2.3.8 and Appendix F,
Networking, for further information.
Summary of Contents for LC-2x16
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