Campbell Scientific CR10X Measurement and Control System - Manual (Page 34)

CR10X OVERVIEW
OV-22
Ethernet - Our network link interfaces allow any
Campbell Scientific datalogger with an RS-232
or CS I/O port to communicate with a computer
using TCP/IP. This allows our dataloggers to
communicate over a local network or a
dedicated internet connection.
Multidrop - The MD9 Multidrop Interface links a
central computer to over 200 dataloggers on a
single coaxial cable. Total coax cable length
can be up to three miles.
Radio Frequency (RF) - Campbell Scientific’s
RF communication system uses a radio modem
and a low-powered transceiver at the remote
station(s), and a transceiver connected to an
RF Base Station at the computer. Up to 254
stations can be interrogated over a single UHF
or VHF frequency. Maximum transmission
distance is up to 25 miles between stations
(line-of-sight); effective distance can be
extended using repeaters.
Our new RF400 spread spectrum radios
provide communication between a base station
computer and one to several field sites over
short distances. Contact CSI for help in
configuring your RF system.
Short Haul Modems - Short haul modems
provide local communication between the
datalogger and a computer with an RS-232
serial port. The modem transmits data up to
7.6 miles over four-wire unconditioned line (two
twisted pairs). An SC932(C) Interface is
required to connect the modem to the
datalogger. Surge protectors on both ends of
the transmission line are strongly
recommended.
Direct Datalogger to Computer Interface -
The SC32A Interface or the CR23X’s on-board
RS-232 interface provides an optically isolated
connection between the datalogger and a
computer over distances up to 50 feet.
Telephone Networks - Telephone
communication links require a CSI field modem
at the datalogger site and a Hayes-compatible
modem at the calling end. Data are transferred
at 300, 1200, or 9600 baud. Surge protection
for the field modem is strongly recommended.
Remote RF or MD9 networks are also
accessible by telephone.
Analog Cellular - A cellular Motorola
transceiver and a Campbell Scientific field or
voice modem are used to communicate
between a Campbell datalogger and a base
station computer. A subscription to a cellular
network with analog coverage at the datalogger
site is required. Analog cellular bandwidth limits
transmission speed to 1200 baud. Cellular
communication is a convenient alternative for
mobile applications or for locations where
ordinary phone lines aren’t established. Cellular
communication is advantageous over RF
systems because an FCC-assigned frequency
is not required.
Voice Modem - A CSI voice-synthesized
modem allows a CR10(X) to transmit by voice,
real-time or historical data stored in the
datalogger.
Satellite - GOES and Argos satellites offer a
convenient telecommunication alternative for
field stations where phone lines or RF systems
are impractical. CSI supports GOES satellite
telemetry with a NESDIS-certified High Data
Rate GOES transmitter.