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Satelline
1870 Economical Short-Range Radio Modem SATELLINE-1870
complements the world-wide established product line of SATELLINE radio
modems at the low-power end of applications. Thanks to its small size,
multiple functions and low carrier power the SATELLINE-1870 is
particularly well suited for internal applications within industrial
complexes. The
SATELLINE-1870 uses the all-European licence-free 868…870 MHz
frequency band. This band is divided into sub-bands according to the
output power and duty cycle allowed for the transmitter. When changing
the frequency the user need not worry about these limitations, because
SATELLINE-1870 automatically sets the output power according to the
regulations. Due to the limited output power the maximum communication
distances are of the order of 5 km in best possible conditions. Low
power, high functionality SATELLINE-1870
was designed for the transfer of data and alarm messages in a
short-range network covering, for instance, factory buildings included
in an industrial complex. With its small size and low output power of
maximum 100 mW it meets both the technical and economic requirements
set on wireless communications in this kind of application
environment. The communication range can be extended by using the
built-in repeater function. The data speed over the radio interface is
9 600 bps. The
DTE interface of SATELLINE-1870 is compatible with the RS-232 serial
interface. The settings of the radio modem can be changed from an
external terminal in the programming mode or through auxiliary
SL-commands during normal operation. The
software of the SATELLINE-1870 resides in a flash memory, which is
easily re-programmable through a PC and a special programming device. Equipment and Know-how from your radio modem supplier Satel Oy is a Finnish
electronics and telecommunications company that specialises in
wireless data communications. It designs, manufactures and markets
radio modems for data and alarm transfer systems. The main user groups
include industrial companies, public organisations and private
persons.Today
Satel is one of Europe’s leading manufacturers of narrow-band radio
modems. Satel
Oy has prepared an extensive set of Application Notes describing
different ways of utilising the SATEL radio modems in various
applications. For further information about our products and their
applications, please see our home page www.satel.fi or contact your
local dealer. Effective
package of multiple functions As
the SATELLINE-1870 is operated in the 868-870 MHz frequency band, the
user may freely choose among the existing sub-bands. The maximum
output power limit (5, 10, 25, 50 or 100 mW ERP for each sub-band) is
pre-programmed into the SATELLINE-1870, and will be automatically set
when changing the sub-band. The
channel spacing of SATELLINE-1870 is 25 kHz, and the data speed of
transmission is 9
600 bps. The radio modem is compatible with the RS-232 interface. The
data speed of communication through the RS-232 interface is 300-19 200
bps.
Always
precisely tuned To
avoid the carrier frequency drift a digital Adaptive Frequency
Correction (AFC) function has been implemented in SATELLINE-1870. The
AFC function is included in the receiver part of the radio modem. At
the start of each reception the small frequency difference between the
receiver and the transmitter is determined using digital measuring
techniques. Based on the result the receiving modem will adjust its
frequency to match the frequency of the transmitter as precisely and
as fast as possible. The
AFC helps to maintain maximum sensitivity of reception, to ensure high
reliability of data transfer. SATELLINE-1870
is initialised and the settings are altered from an external terminal.
The radio modem has to be set into the Programming mode when changing
the radio settings. The settings can also be altered during normal
operation in the Data Transfer mode by means of auxiliary SL-commands,
which are entered amidst ordinary data. In the front panel of
SATELLINE-1870 there are five LED-indicators showing the status of the
serial port and the radio interface. In case it is necessary to extend the coverage of the radio modem network, SATELLINE-1870 modems can be used as repeater stations. When operated in the Repeater mode, the radio modem receives data through the radio interface, buffers the received data and transmits it further using the same radio frequency as in the reception. |
