OG_MU-4-434_v10e Circuit Design, Inc.
21
OPERATION GUIDE
4.3.3 1:N relay system
The diagram below shows a 1:N system using the relay function, in which communication is performed with several
target stations at a remote location.
In the diagram, the route information is entered directly in the transmit command, however communication is also
possible using the route register content.
Source
station
Relay
station
1
Relay
station
2
Relay
station
3
Target
station
2
Target
station
1
Target
station
3
Note: UI = User ID, GI = Group ID, EI = Equipment ID, DI = Destination ID, RT = Route information
UI=0055
GI=01
EI=0A
DI=Discretionary
RT=Discretionary
UI=0055
GI=01
EI=0B
DI=Discretionary
RT=Discretionary
UI=0055
GI=01
EI=0C
DI=Discretionary
RT=Discretionary
Data transmission commands issued
Target station 1: @DT05ABCDE%A02,03,08,0A
Target station 2: @DT05ABCDE%A02,03,08,0B
Target station 3: @DT05ABCDE%A02,03,08,0C
Relay System Example 3 (Route information entered directly, with ACK response, polling system)
Transmit 5-byte data
‘
ABCDE
’
Receive data
‘
ABCDE
’
Packet
ACK
Packet
ACK
UI=0055
GI=01
EI=01
DI=Discretionary
RT=Discretionary
UI=0055
GI=01
EI=03
DI=Discretionary
RT=Discretionary
UI=0055
GI=01
EI=02
DI=Discretionary
RT=Discretionary
UI=0055
GI=01
EI=08
DI=Discretionary
RT=Discretionary
Packet
ACK
Packet
ACK
Broadcast communication
If data is transmitted after Equipment ID = 00h as the last number in the route of the source station route information
settings, all target stations receive the data at the same time, irrespective of the Equipment ID.
The command for the system in the diagram above is as follows.
Control transmit command 3: @DT 05 ABCDE %R 02,03,08,00
However, note that the data is transmitted in a range to which the radio waves reach from the last relay station (relay
station 3). In other words, relay station 2 also receives the data at the same time.
Also, do not use commands with ACK responses (command options: /A, /B, %A, and %B) in the transmit command
since these cause radio wave collisions.
