Campbell ST-21 - User Manual

COMPONENTS
ST-21
Argos Satellite Transmitter
Benets and Features
Well-suited for remote meteorological and environmental
data-collection applications, including mobile and high-
latitude installations
Compatible with Campbell Scientic’s CR800, CR850, CR1000,
and CR3000 dataloggers
Provides uplink capability for up to eight unique ID codes,
frequencies, and repetition periods
Supports up to seven independent Argos data buers that can
be populated in real-time
Transmits variable-length Argos messages with either 20- or
28-bit ID codes
Allows researchers to forgo a rigorous certication process
Includes an autorepeat feature that allows the ST-21 to repeat
data without host intervention
Provides a fail safe feature that alerts users upon communica-
tion link or host failure
Allows the ID and repetition rates to be set in real-time or by
Campbell Scientic
www.campbellsci.com/st-21
Overview
Campbell Scientic’s ST-21* is a Service Argos-certied Platform
Transmitter Terminal (PTT ) that transfers data from the datalog-
ger site to the Argos Data Collection and Location System via
NOAA polar orbiting satellites. This transmitter is well suited for
remote meteorological and environmental data collection ap-
plications, including mobile and high-latitude installations. The
ST-21 is compatible with our newer dataloggers.
*While Campbell Scientic’s ST-21 Argos PTT is based on Telonics’ ST-21, they are not equivalent; our ST-21 includes a case, voltage regulator, and our
SDC communication interface.
questions & quotes: 435.227.9000

Campbell ST-21 Specifications