5
Short Haul
e SRM-5A Short Haul Modem supports communi-
cations between the datalogger and a computer via a
four-wire unconditioned line (two twisted pairs).
Radio Frequency (RF) Networks
Our RF networks transmit data over a radio frequency.
Line-of-sight is required for all RF networks.
•RF320-series UHF/VHF narrowband radios can
transmit data for up to 25 miles, line-of-sight. At
the eld station and repeater stations, the radio is
attached to an RF500M modem. e computer
base station should include a radio, PC, and an
RF500M modem or RF500B base station. e
RF320-series radios require an FCC license.
•VSP3 Vosponder allows customers to call a data-
logger via a hand-held UHF or VHF radio and
receive a verbal report of real-time site conditions.
•RF401-series, RF430-series, and RF450 spread
spectrum radios can provide communications
between a base station computer and several eld
stations over short distances. An individual FCC
license is not required.
Internet and IP Networks
e following methods allow our dataloggers to
communicate with a computer using TCP/IP.
•NL240 modules provides Wi-Fi connectivity to
our dataloggers and peripheral devices over stan-
dard 802.11b/g/n networks. It also provides access
to the datalogger’s internal TCP/IP stack.
•NL115 and NL120 modules support Ethernet
communications via the peripheral port on a
CR1000 or CR3000 datalogger. ey also provide
access to the datalogger’s internal TCP/IP stack.
•NL200 module is compatible with PakBus data-
loggers. It also provides access to the datalogger’s
internal TCP/IP stack.
•CR9000X ‘s on-board 10baseT/100baseT port sup-
ports Ethernet communications without using an
Ethernet interface.
•NL100 10baseT interface is compatible with
all of our dataloggers.
Software Support
e base station computer needs to be running one
of our soware packages. Palm OS-based handheld
devices use PConnect soware, and Pocket PC devices
use PConnectCE soware. Our PC200W soware is
available, at no charge, from our website; it supports
direct communications only. PC400, RTDAQ, and
LoggerNet soware support our direct and telemetry
options. LoggerNet also supports scheduled data
collection and combining data retrieval methods
(e.g., phone-to-radio).
Combining Options
You can increase the exibility, convenience, and reli-
ability of your application’s data storage and retrieval
by combining an on-site device with a telemetry de-
vice. For example, cellular phone with on-site back-up
provided by a CompactFlash card combines an on-site
and telemetry device. You can also combine two
telemetry methods. Popular telemetry combinations
are Ethernet-to-radio, multidrop-to-spread spectrum
radio, phone-to-multidrop, Ethernet-to-multidrop,
and phone-to-radio.
All of our RF networks require line-of-sight transmission. The mountain in this drawing obstructs line-of-sight with the base station.
Use of the repeater station allows the base station to receive data from the eld stations.
Base Station (Ofce)
Repeater Station
Field Station
Field Station
(30 pages)
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