COMPONENTS
ST-21
Argos Satellite Transmitter
Benefits and Features
Well-suited for remote meteorological and environmental
data-collection applications, including mobile and high-
latitude installations
Compatible with Campbell Scientific’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 buffers 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 certification 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 Scientific
www.campbellsci.com/st-21
Overview
Campbell Scientific’s ST-21* is a Service Argos-certified 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 Scientific’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
