SATELLINE-2ASxE
User Guide, Version 2.0
19
5.4 A system with one repeater station
In systems with several repeater, sub and base stations it is necessary to use addresses in the radio
modems especially if there is more than one repeater station. A system with only one repeater
station can be built without addressing. However, the message will be duplicated on the
communication route (the base station hears the messages from both the substation and the
repeater station).
There are at least two alternative ways to use addressing depending on the programmability of the
terminal equipment and the number of repeater stations and their positions to each other.
5.4.1 The alternating addresses of a pair of radio modems
When neither the terminal nor the substations are able to generate address fields, but they can
recognize the message addressed to them, the addresses of the radio modems can be alternating.
The transmission (TX) and reception (RX) addresses of the radio modems alternate according to the
following table:
Base
station
address
The address of
repeater station 1
and substations of
the base station
The address of the
substations of the
repeater station 1
TX address address 1
address 2
address 1
RX address address 2
address 1
address 2
In a system using alternating addresses the routing of data to a specific radio modem is set at the
time of installation. The order of the addresses must be set according to the wished routing of data.
Please note that in systems with alternating addresses the base station and the substations hear their
own messages repeated.
