Marantz SC7S1/F1N, Руководство по обслуживанию

Страница: 22 / 36

30
8. BUS SPECIFICATIONS
< Features >
This unit employs a bus system incorporating the 'e-Bus' (bi-directional packet communications) concept, and is used for control
of independent and system operation.
The Master unit controls all the bus sysytem.
The bus system provides for mutual recognition, with control commands and status information being sent and received between
units, thus allowing linked operation of multiple units.
When multiple Slave units are connected to the Master unit and power is switched ON, the system is set up (volume value,
functions) automatically, and setup for each Slave unit is therefore unnecessary.
The Master unit manages system operation when the ID number switch is set to [1]. Slave units are managed and controlled by
the Master when the ID number switch is set to [2] to [6].
Up to six units can be connected to the bus.
< Connections >
This bus system uses hardware relays for bus communications unrestricted by ON/OFF switching of multiple SC-7S1 power
supplies. The first and last units need not be directly connected, and units are connected by a single remote cable (Mini DIN
cable).
A slave unit can be added to the existing system anywhere in the bus loop. ID numbers are not required to be set in the order of
the connection. The master can recognize the slave units regardless of the connection order of the ID numbers.
As the SC-7S1 bus system is unique, only SC-7S1s can be connected.
< Operation >
Only units in operation (power ON) are recognized and treated as existing units on the bus. When power for a Slave unit is OFF
the hardware relay lets through the unit on the bus.
ID numbers are set with the ID number switches on the rear panel.
Button commands and remote commands received by the Master unit are transmitted to the slaves depending on the command
content.
Commands from remote controller are received only by the Master unit (not by Slave units).
When the Master unit receives the command without any modification,the command is what has been transmitted by the Master
itself to the bus upon power on, the Master assumes that no slave is connected and turns into stand alone operation.
RS-232C interface specifications (4800bps, 8 data bits, non-parity, 1 stop bit) is used as the specifications for this bus system
communication. For sound quality, communication occurs only when an operation is made. Polling is not used.
When multiple units are connected, the bus loop is established regardless of whether Slave unit power is ON or OFF. The only
case in which data is not returned to the Master unit is therefore when the connection is not phisically made.
The critical point fot service is whether or not data sent from TXD (pin 46 on the microcomputer) while Master unit power is ON
is received at RXD (pin 45 on the microcomputer). If there is a problem and data is lost, 'E12' error is displayed on the Master
unit. In this case, there may be a short circuit in the pattern or a part may be broken . Check the Data Flow diagram and trace the
TXD data.