SATELLINE-2ASxE
User Guide, Version 2.0
16
5 Using Addresses in Data Communication
5.1 General
It is possible to use addresses in both transmission (TX) and reception (RX). An address consists of
two data characters (altogether 16 bits). The addresses can either be the same in both directions or
when necessary the transmission and the reception addresses can also be different.
Each modem has two pairs of addresses, the primary (1) and the secondary (2) addresses.
If only
one pair is necessary both address pairs should be set equal
i.e. TX1=TX2 and RX1=RX2.
The secondary addresses are normally useful only if the radio modem is used as a
repeater.
The addresses can be selected separately for both directions. It is also possible to transfer the
received address to the RS interface.
An address consists of the first two characters of a data packet that the radio modem adds to every
sent packet and/or checks from every received packet. (compare to paragraph 7.3.1 SLAxy
command, where ADD H corresponds to x and ADD L corresponds to y)
ADD H ADD L DATA
Transmission:
Data
Address Data
Data
Data
Fig 1 Transmission addressing has been set
ON. The radio modem will add the primary
TX address to the beginning of the data
packet.
Fig 2 Transmission addresssing has been set
OFF. The radio modem will transmit the data
packet as such.
