Sherwood R-771 Owners manual

-Sherwood RS232 protocol-

V.1.1

R-771 Audio RS232 Communication Protocol

Application model : R-771

1. Connection

5

9

1

6

2. Communication format

Communication speed : 9600BPS
Character length : 8bits
Parity Bit : None
Error check : Checksum
Start bit : 1bit("0")
Stop bit : 1bit("1")
Bit length : 104us

Start bit Bit0

LSB

Pin 1 : NC
Pin 2 : TxD
Pin 3 : RxD
Pin 5 : Common(GND)
Pin 4, 6, 7, 8, 9 : NC

104us

1byte waveform

Bit7

MSB

Stop bit

3. Message Structure

A. COMMAND :

The message sent to a system(Model 990) from a controller.
It is consist of 4bytes.

a. SYSTEM ID : 0x8345

The message started with this code is a command for controlling our system.

b. CHECKSUM :

8bits beneath sum of all data from SYSTEM ID to DATA.

checksum

CHECKSUMDATASYSTEM ID

2byte 1byte 1byte

1

-Sherwood RS232 protocol-

c. DATA :

DATA

0x01

0x02

0x03

0x04

0x05

0x06

0x07

0x08

0x09

0x0a

0x0b

0x0c

0x0d

0x0e

0x0f

0x10

0x11

0x12

0x13

0x14

0x15

0x16

0x17

0x18

0x19

0x1a

0x1b

0x1c

0x1d

0x1e

0x1f

0x20

0x21

0x22

0x23

0x24

0x25

0x26

0x27

0x28

0x29

0x2a

0x2b

0x2c

0x2d

0x2e

0x2f

0x30

OPERATION

Power On

Standby On

"TUNER" input select

"CD" input select

"AUX" input select

"VCR1" input select

"VCR2" input select

"VCR3" input select

EXT IN input select On / OFF

Master volume up

Master volume down

Main mute On/Off

Channel select ON/ OFF

OSD On/Off

OSD Cursor move up

OSD Cursor move down

OSD Cursor move left

OSD Cursor move right

Sleep On, sleep time adjust and Off

System display dimmer, Off and On

Test tone On/Off

Digital/Analog input select

Stereo(Downmix) On

Surround mode select up.

Surround mode select down

No. 0

No. 1

2

-Sherwood RS232 protocol-

DATA OPERATION

0x31

0x32

0x33

0x34

0x35

0x36

0x37

0x38

0x39

0x3a

0x3b

0x3c

0x3d

0x3e

0x3f

0x40

0x41

0x42

0x43

0x44

0x45

0x46

0x47

0x48

0x49

0x4a

0x4b

0x4c

0x4d

0x4e

0x4f

0x50

0x51

0x52

0x53

0x54 Master Volume Level : Low (0)

0x55 Master Volume Level : Middle (60)

0x56 Master Volume Level : High (70)

No. 2

No. 3

No. 4

No. 5

No. 6

No. 7

No. 8

No. 9

Tuner Preset scan

Tuner preset up

Tuner preset down

Tuner tune up

Tuner tune down

OSD Enter or Memory

Zone2 On/Off

Zone2 volume up

Zone2 volume down

B. EVENT :

The message sent to a controller from a system(Model 990).
It includes most of system status
and is sent to a controller each time the status of system is changed.

It is consist of 28bytes.

CHECKSUM

SYSTEM ID COUNT TEXT1 ………

TEXT10

DATA

a. SYSTEM ID :

0x8345.

STATUS15

CHECKSUMSTATUS1 ………

3