Marantz dv4001 補足マニュアル
DV4001/DV6001/VC6001
RS-232C Control Specification
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Document Version [1.0]
Company Restricted
3-3. The transaction sequences and the regulations
3-3-1. The transaction sequences
The transactions have three kinds of sequence.
*A transaction is a Command from Host then Slave will be an answer by Status answer, ACK or NAK.
*A transaction is a Status request from Host then Slave will be an answer by Status answer or NAK.
*A transaction is Auto status feedback from Slave when a Slave’s status changed. (If the auto status
feedback is enabled.)
*A transaction is a Status request from Host then Slave will be an answer by Status answer or NAK.
*A transaction is Auto status feedback from Slave when a Slave’s status changed. (If the auto status
feedback is enabled.)
3-3-2. The transaction regulations
The transactions have some kinds of regulation.
* An answer (ACK, NAK or Status answer) transmission from the Slave has to finish within 500ms when
got a Command or a Status request from Host.
* Host must not transmit an another Command or Status request until "it receives a answer by a
previous Command or Status request" or "it passes a term of waiting time from a finishing of previous
transmission of a Command or a Status request ".
* Slave has to finish a transaction under 500ms when it sends Auto status feedback data.
got a Command or a Status request from Host.
* Host must not transmit an another Command or Status request until "it receives a answer by a
previous Command or Status request" or "it passes a term of waiting time from a finishing of previous
transmission of a Command or a Status request ".
* Slave has to finish a transaction under 500ms when it sends Auto status feedback data.
3-3-3. Specification of Auto status feedback
There are some specific regulations about Auto status feedback.
* The product status has segmented into four layers of 1, 2, 3 and 4.
* The status of layer 1 is assigned most kindly status to Host. (The statuses of layer 2 are assigned kindly status, the
statuses of layer 3 are not so need status to Host and the statuses of layer 4 are probably no wished statuses.)
* Each layer status can control transmit enable or disable by Host command. (The product default
would be all disables.)
* Slave sends auto status feedback by itself when the status is changed and if the status feedback is
enabled.
* The product defined and segmentation layers are taking in status list.
* The status of layer 1 is assigned most kindly status to Host. (The statuses of layer 2 are assigned kindly status, the
statuses of layer 3 are not so need status to Host and the statuses of layer 4 are probably no wished statuses.)
* Each layer status can control transmit enable or disable by Host command. (The product default
would be all disables.)
* Slave sends auto status feedback by itself when the status is changed and if the status feedback is
enabled.
* The product defined and segmentation layers are taking in status list.
3-3-4. Example of the transactions
<Host> <Slave>
TxD RxD
RxD TxD
Example of the transactions
max. 0.5sec
a transaction
a transaction
Command
Status answer ,
ACK or NAK
ACK or NAK
Status
request
request
Status answer
max. 0.5sec