Transmission Data Format; Transmission Data Format From Host To Slave; Form1: Command; Form2: Status Request - Marantz SR7001 Specification

SR7001

3-2. Transmission data format

3-2-1. Transmission data format from Host to Slave

There are two kinds of transmission data form from Host shown below.

3-2-1-1. Form1: Command

Command is a data that requests some status change.
Start character
COMMAND
End character (CR) : 0Dh

3-2-1-2. Form2: Status request

Status request is a data that requests a answer of some status.
Start character
Request status
Request character : '?'
End character (CR) : 0Dh

3-2-2. Transmission data format from Slave to Host

There are two kinds of transmission data form from Slave shown below.

3-2-2-1. Form1: ACK/NAK

ACK is a reply data from Slave when Slave got an acceptable command data from Host.
(ACK is sent to Host when Slave has no related status by the Command.)
Start character
NAK is a reply data from Slave when Slave got an incorrect Command data, Status request data or
some other data from Host.
Start character

3-2-2-2. Form2: Status answer and Auto status feedback

Status answers are reply data when Slave got an acceptable Request status or Command data from
Host. Auto status feedbacks are send to Host data when a Slave's status is changed.
Start character
Answer character
End character (CR) : 0Dh
RS-232C Control Specification
: '@'
: see "Command list"
start command
'@' "xxx:"+"..."
: '@'
: see "Status request list"
start request status
'@' "xxx:?"+"..."
: '@',
start A ACK
CR
' @
06h 0Dh
'
: '@',
start A NAK CR
' @
15h 0Dh
'
: '@'
: see "Status list"
start status
'@' "xxx:"+"..."
Company Restricted
end
0Dh
end
0Dh
ACK : 06h, End character (CR) : 0Dh
NAK : 15h, End character (CR) : 0Dh
end
0Dh
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