Cambridge Audio azur 840A Manuel
Gallery Court, Hankey Place, London SE1 4BB England Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 Web: www.cambridge-audio.com
Azur 840A (V1 & V2) and 840E Serial Control Protocol V1.1
1.1 RS232 Protocol
The protocol is accessed via COM1 i.e. the rear panel RS232C port.
1.2 Command Format
Header Command Command Command Footer
Group Number Data
# 1 to 6 , 01 to 18 , XXXX CR
byte num: 1 1 1 2 1 XX 1
Notes:
All data consists of ASCII bytes.
Settings for RS232 comm port are 9600,N,8,1 with no handshaking.
CR is carriage return, ASCII value 13 decimal.
Command Data consists of 10 characters maximum.
1.3 Command Groups
Commands are split into the following groups:
Command Description
Group
1 Control Commands
2 Setup Commands
3 Replies from Setup Commands
4 Replies from Control Commands and Updates
5 Error Messages
Gallery Court, Hankey Place, London SE1 4BB England Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 Web: www.cambridge-audio.com
1.4 Commands and Messages
1.4.1 Group 1 - Control Commands
Command Command Description Command Data Example
Number
01 to 07 Main Input Selects No Data #1,02,\r - Select Input 2
08 Tape Monitor 0 - Off, 1 - On #1,08,1\r - Tape monitor on
09 Main Input Up No Data #1,09,\r - Next input up
10 Main Input Down No Data #1,10,\r -Next input down
11 Power State 0 - Standby, 1 - On #1,11,0\r - Put 840A in standby
12 Mute State 0 - Mute Off, 1 - Mute On #1,12,1\r - Mute volume
13 Goto Volume 00 to 72 - Volume Level #1,13,10\r - Set volume to 10
Note - For 840A V1 : 00:min, 72:max
For 840A V2 & 840E : 00:min, 96:max
14 Volume Up No Data #1,14,\r - Start volume up
15 Volume Down No Data #1,15,\r - Start volume down
16 Volume Stop No Data #1,16,\r -Stop volume changing
17 Set Balance 00 to 16 - Balance Level #1,17,08\r -Balance neutral
Note - 00:max left, 08:neutral, 16:max right
18 Balance Right No Data #1,18,\r -Balance right
19 Balance Left No Data #1,19,\r -Balance left
20 LCD Brightness 0 - Off, 1 - Dim, 2 - Bright #1,20,2\r - LCD bright
21 Speaker Select 0 - A, 1 - AB, 2 – B (840A V1 & V2 only) #1,21,1\r - Speaker AB
23 Abus Input Select 1 - Input 1, 2 - Input 2, 3 - Input 3, 4 - Input 4,
5 - Input 5, 6 - Input 6, 7 - Input 7,
8 - Tape Monitor
#1,23,7\r - Select Abus input 7
24 Set Bass 00 to 30 - Bass Level
Note - 00:min, 15:neutral, 30:max #1,24,15\r -Bass neutral
25 Set Treble 00 to 30 - Treble Level
Note - 00:min, 15:neutral, 30:max #1,25,15\r -Treble neutral
26 Set Direct 0 - Off, 1 - On #1,26,1\r - Direct on
Gallery Court, Hankey Place, London SE1 4BB England Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 Web: www.cambridge-audio.com
1.4.2 Group 2 - Setup Commands
Command Command Description Command Data Example
Number
01 Get Software Version No Data #2,01,\r - Get software version
02 Get Protocol Version No Data #2,02,\r - Get protocol version
03 Set Input Name 1 to 8,Name #2,03,2,Ipod\r - Name input 2 'Ipod'
Note - Name must be max 8 characters
1.4.3 Group 3 - Replies from Setup Commands
Command Command Description Command Data Example
Number
01 Software Version X.X #3,01,1.2\r - Software is version 1.2
02 Protocol Version X.X #3,02,2.4\r - Protocol is version 2.4
03 Input Name Changed 1 to 8,Name #3,03,3,DAB \r - Input 3 named 'DAB '
Note - Name will be max 8 characters
Gallery Court, Hankey Place, London SE1 4BB England Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 Web: www.cambridge-audio.com
1.4.4 Group 4 - Replies from Control Commands and Updates
Command Command Description Command Data Example
Number
01 to 07 Main Input Source Changed No Data #4,02,\r - Main input 2 selected
08 Tape Monitor Changed 0 - Off, 1 - On #4,08,1\r - Tape monitor on
11 Power State Changed 0 - Standby, 1 - On #4,11,0\r - 840A in standby
12 Mute State Changed 0 - Mute Off, 1 - Mute On #4,12,1\r - Mute on
13 Volume Changed 00 to 72 - Volume Level #4,13,15\r - Volume level now 15
Note - For 840A V1 : 00:min, 72:max
For 840A V2 & 840E : 00:min, 96:max
14 Volume Increasing No Data #4,14,\r - Volume increasing
15 Volume Decreasing No Data #4,15,\r - Volume decreasing
16 Volume Stopped 00 to 66 - Volume Level #4,16,20\r - Volume stopped changing at 20
17 Balance Changed 00 to 16 - Balance Level
Note - 00:max left, 08:neutral, 16:max right #4,17,08\r -Balance is neutral
20 LCD Brightness Changed 0 - Off, 1 - Dim, 2 - Bright #4,20,1\r - LCD dim
21 Speaker Selection Changed 0 - A, 1 - AB, 2 – B (840A V1 & V2 only) #4,21,1\r - Speaker B selected
22 Headphones In / Out 0 - Out, 1 - In #4,22,1\r - Headphones inserted
23 A-BUS Input Source Changed 1 - Input 1, 2 - Input 2, 3 - Input 3, 4 - Input 4, #4,23,7\r - A-BUS input 7 selected
5 - Input 5, 6 - Input 6, 7 - Input 7,
8 - Tape Monitor
24 Bass Level Changed 00 to 30 - Bass Level
Note - 00:min, 15:neutral, 30:max #4,24,15\r -Bass is neutral
25 Treble Level Changed 00 to 30 - Treble Level
Note - 00:min, 15:neutral, 30:max #4,25,15\r -Treble is neutral
26 Direct State Changed 0 - Off, 1 - On #4,26,1\r - Direct is on
Gallery Court, Hankey Place, London SE1 4BB England Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 Web: www.cambridge-audio.com
1.4.5 Group 5 – Error Messages
Command Command Description Command Data Example
Number
01 Overload Error No Data (840A V1 & V2 only) #5,01,\r - Overload error
02 DC Offset Error No Data (840A V1 & V2 only) #5,02,\r - DC offset error
03 Over Temperature Error No Data (840A V1 & V2 only) #5,03,\r - Over temperature error
04 Clipping Error No Data (840A V1 & V2 only) #5,04,\r - Clipping error
05 Mains Fail No Data (840A V1 & V2 only) #5,05,\r - Mains failed
06 Speaker Fail No Data (840A V1 & V2 only) #5,06,\r - Speaker failed
07 Command Group Unknown No Data #5,07,\r - Command error
08 Command Number in Group
Unknown No Data #5,08,\r - Command error
09 Command Data Error No Data #5,09,\r - Data error
Information in this document has been carefully checked for accuracy; however, Cambridge Audio's policy is one of continuous improvement, therefore design and specifications are subject to
change without prior notice. If you notice any errors please feel free to email us at: support@cambridgeaudio.com
This document contains proprietary information protected by copyright. All rights are reserved. No part of this document may be reproduced by any mechanical, electronic or other means, in
any form, without prior written permission of the manufacturer.
© Copyright Cambridge Audio Ltd 2006
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