Marantz SR7400 Specification

RS232C Control Spec. Page: 5 / 17
SR7400/8400 Document Version [1.00]
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
End
0Dh
COMMAND Start
‘@’
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
End
0Dh
Request status
Start
‘@’
‘?’
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
ACK
06h
NAK
15h

Marantz SR7400 Specifications

General

Number of Channels	7
DTS Processing	DTS, DTS-ES, DTS Neo:6
Component Video Inputs	3
Tuner	AM/FM
Type	AV Receiver
THD	0.08%
Input Sensitivity	200 mV
Signal to Noise Ratio	105 dB
Frequency Response	10 Hz - 100 kHz
Weight	28.7 lbs
Total Harmonic Distortion	0.08%
Signal-to-Noise Ratio	105 dB
HDMI Inputs	No
Preamp Outputs	Yes
Output Power (8 ohms)	105 watts per channel
Digital inputs	3 optical, 2 coaxial
Input Sensitivity/Impedance	200 mV / 47k ohms