User manual

Chapter Three Operation
Man_805U Rev 1.9 Page 21
Here is an example :
Module A, B and C are
configured as transparent
repeaters. Module A is
configured with group
addresses 1 & 2, module B
with group addresses 2 & 3
and module C with group
addresses 3 & 4.
Module S and T are
configured with group
address 1 (only one group
address as it is not configured as a repeater). When S transmits a message, T and A will
receive it and output the data. If module X can hear the message, it will not output it as
module X is configured with group address 2.
Repeater A will re-transmit the radio message, but on group address 2. Module S and T will
receive the re-transmitted message, but will not output the message as the group address is
now wrong. Module X will receive the message and will output the message as the group
address is now correct.
Repeater B will also receive the re-transmitted message from A, and will output the data as
well as re-transmit on group address 3. The only other module which is also on group address
3 is repeater C. It will accept the message and re-transmit it on group address 4 - to module Z.
Note that when a message is transmitted from a remote module, the repeaters will only
transmit a message in one direction. For example :
When X transmits a
message, repeater A will
receive the message on
group address 2. Repeater
A will not output the data
as the group address is not
the repeater’s first group
address. Repeater A will
re-transmit on group
address 1 to modules S
and T. But repeater B will
not accept the re-
transmitted message on
group address 1.
If repeater B is able to hear the original message from module X (on group address 2), then it
will re-transmit it on. But if it cannot, then the message will not be transmitted on to Z.
3.6 Controlled Mode
In controlled mode, data is only transferred between two modules (that is, a point to point
link). One of the modules is configured as a “master” unit and the other as a “slave” unit.
There can also be up to five intermediate repeaters in the link. Each 805U unit is configured
A
B
C
Group Address
First
1 2 3
Second
2
3 4
S
T
X
Z
Repeaters
Remote
Modules
Group Address 1 2 4
A
B
C
Group Address
First 1 2 3
Second 2 3 4
S
T
X
Z
Repeaters
Remote
Modules
Group Address 1 2 4