Version
3.3
23
Reception addressing
has been set OFF.
The radio modem will
transfer all received
data to the RS-232
interface.
Reception
addressing
has
been set OFF.
The radio modem will
consider the characters of
the address as a part of the
data and will send all the
characters to the RS-232
interface.
Reception addressing has
been set ON but there is
no address in the data
packet.
Data will appear on the RS-
232 interface ONLY if the
first 2 characters of the
data match either of its own
RX-address. The radio
modem will remove those 2
characters of data.
7.1.1
Connection between two points
When forming a connection between two points it is recommended that both the reception and
transmission addresses are identical in both radio modems. This is the easiest way to control
addresses and the risk caused by interference from other systems operating in the same area is
minimal.
Example: by setting all addresses of both radio modems to a value ´1234´, they will accept
only those messages which contain this address, and they will use this same value when
transmitting data.
If the channel is reserved for use only by the said network, or if the terminal devices are
responsible for addressing, it is not necessary to use addressing in the radio modems.
7.1.2
System of one base station and several substations
In systems with several substations, the base station must know to which substation each
message is intended, and from which substation each received message originates. Usually
terminal devices handle addressing completely, but it is also possible to use the addressing
functionality of the radio modems.
Data
Data
Data
Address
Data
Address
Data
E
R
R
O
R
