32
Remote Bus Connection
ID Numbers
Each unit is identified by a set ID number.
Each ID number is set by the user.
The unit with ID=1 is as the Master. ID=1 is also used for stand-alone (single-unit) operation.
If there are multiple units with the same ID number, connection error occurs and the error code is displayed,
The Master must be at the top in the bus connection.
ID numbers 2 to 6 connected after the Master are assumed to be for Slave units.
The Master controls all the Slave units connected to the bus.
Units with the ID numbers 2 to 6 cannot be operated independently. Those units require control signals from the Master unit for
operation. The last unit connected on the bus is referred to as the End Slave unit.
Outline of Bus Connections
The units are connected to the bus with the supplied remote cable (Mini DIN 8p).
The units are connected via photocouplers (Q273) and that is floated for sound quality, so a Hot and Cold pair is used for
communication.
The bus connection is established by receipt of the Return signal (dotted line) from the End Slave.
The circuit is designed to detect automatically if the unit is the End Slave. And if so the unit sends the Return signal to the
Master.
The circuit is designed that the bus connection is established even if power of a Slave unit is OFF.
Actually, the remote cable (dotted line arrow) from the End Slave to the Master is not necessary, the bus (solid line arrows) is
bidirectional so the Return signal returns to Master through the bus.
The ID numbers are displayed for approximately 3 seconds upon power ON, after that the volume level is displayed for
approximately 5 seconds. Mute is released approximately 8 seconds after power ON.
Bus communication begins at power ON. The Sync LEDs on the display are lit if there is no problem with the communication.
Master and Slave units are identified by the green and read sync LEDs respectively.
If making communication is impossible the Sync LED does not light and the error code is displayed.
As the Master unit controls all the units connected on the bus, Slave units cannot be operated directly (except for power
switches). Only the Master unit accepts commands from the remote controller.
ID=1
Master
ID=2
Slave
ID=3
Slave
ID=4
Slave
ID=5
Slave
ID=6
Slave
Return
END
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
ID=1
Master
ID=2
Slave
IN
OUT
Return
END
Summary of Contents for SC7S1/F1N
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