The Transaction Sequences And The Regulations; The Transaction Sequences; The Transaction Regulations; Specification Of Auto Status Feedback - Marantz ST7001 Specification Sheet

RS232C Control Specification

2-3. The transaction sequences and the regulations

2-3-1. 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.)

2-3-2. The transaction regulations

The transactions have some kinds of regulation.
* An answer (ACK, NAK or Status answer) transmittion by 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 waitinng 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.

2-3-3. 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 are 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 segmentationed layers are takeing in status list.

2-3-4. Example of the transactions

<Host>
TxD
Command
RxD
a transaction
RS232C Control Specification
max. 0.5sec
Status answer,
ACK or NAK
Example of the transactions
Company Restricted
Status
request
max. 0.5sec
Status answer
a transaction
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Document Version [1.01]
<Slave>
RxD
TxD