Marantz SR8300 User Manual
Page 5
RS232C Control Spec
Page: 5 / 16
SR9300/8300 Document
Version
[2.00]
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
: ’@’
ID
: ‘0’ ~ ‘9’ (A Slave has own ID, A Host has to set the ID.)
COMMAND
: see “Command list”
End character
: 0Dh
E n d
0 D h
C O M M A N D
S tart
‘@ ’
ID
3-2-1-2. Form2: Status request
Status request is a data that requests a answer of some status.
Start character
: ’@’
ID
: ‘0’ ~ ‘9’ (A Slave has own ID, A Host has to set the ID.)
Request character : ‘?’
Request status
: see “Status request list”
End character
: 0Dh
E n d
0 D h
R e q u e s t s ta tu s
S ta rt
‘@ ’
‘?’
ID
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
:
06h
NAK is a reply data from Slave when Slave got an incorrect Command data, Status request data or
some other data from Host.
NAK
:
15h
3-2-2-2. Form2: Status answer
Status answers are reply data when Slave got an acceptable Request status data from Host.
Start character
: ’@’
ID
: ‘0’ ~ ‘9’ (A Slave will set own ID.)
Answer character : see “Status answer list”
End character
: 0Dh
End
0Dh
Status answer
Start
‘@’
ID
A C K
0 6 h
N A K
1 5 h