Cambridge Audio Azur 840C 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 840C 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 5 , 01 to 34 , 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:
Group Group Name
Number
1 Control Commands
2 Setup Commands
3 Replies from Control Commands and Updates
4 Replies from Setup Commands
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 Source Select 1 – CD playback, 2 - SPDIF1, 3 - SPDIF2 #1,01,2\r - Select SPDIF 2
02 Input Select Up No Data #1,02,\r - Next input up
03 Input Select Down No Data #1,03,\r -Next input down
04 Get Input Word Width No Data #1,04,\r - Get word width
05 Get Input Sampling Frequency No Data #1,05,\r - Get sampling frequency
06 Digital Output Select 1 - DSP Upsample #1,06,2\r - Select pass through
2 - Pass Through
07 Digital Output Select Toggle No Data #1,07,\r - Select other output
08 Digital Output Word Width 1 - 16 bits, 2 - 20 bits, 3 - 24 bits #1,08,2\r - Set to 20 bits
09 Digital Output Word Width Up No Data #1,09,\r - Next word width up
10 Digital Output Word Width Down No Data #1,10,\r -Next word width down
11 Digital Output Sampling Frequency 1 - 48 kHz, 2 - 96 kHz, 3 - 192 kHz #1,11,3\r - Set to 192 kHz
12 Digital Output Sampling Frequency Up No Data #1,12,\r - Next frequency up
13 Digital Output Sampling Frequency
Down No Data #1,13,\r -Next frequency down
14 Power State 0 - Standby, 1 - On #1,14,0\r - Put 840C in standby
15 LCD Brightness 0 - Off, 1 - Dim, 2 - Bright #1,15,2\r - Set LCD bright
16 Play No Data #1,16,\r - Play
17 Pause No Data #1,17,\r - Pause
18 Stop No Data #1,18,\r - Stop
19 Track Skip Forward No Data #1,19,\r - Track skip forward
20 Track Skip Backward No Data #1,20,\r - Track skip backward
21 Search Forward No Data #1,21,\r - Search forward
22 Search Backward No Data #1,22,\r - Search backward
23 Search Stop No Data #1,23,\r - Search stop
24 Track Number 01 to 99 #1,24,10\r - Enter track number 10
25 Open / Close Toggle No Data #1,25,\r - Open / close
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
1.4.1 Group 1 - Control Commands continued
Command Command Description Command Data Example
Number
26 Random Toggle No Data #1,26,\r - Random
27 Remain Toggle No Data #1,27,\r - Remain
28 Repeat Toggle No Data #1,28,\r - Repeat
29 Program Toggle No Data #1,29,\r - Program
30 Intro Toggle No Data #1,30,\r - Intro
31 Space Toggle No Data #1,31,\r - Space
32 A-B Toggle No Data #1,32,\r - A-B
33 Digital Dither 0 - Off, 1 - On #1,33,1\r - Digital dither on
1.4.2 Group 2 - Setup Commands
Command Command Description Command Data Example
Number
01 Get Main Software Version No Data #2,01,\r - Get software version
02 Get DSP Software Version No Data #2,02,\r - Get software version
03 Get Protocol Version No Data #2,03,\r - Get protocol version
04 Set Digital Input Name 1 or 2, Name #2,04,2,DH9500\r - Name input 2 'DH9500'
Note - Name must be max 10 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
1.4.3 Group 3 - Replies from Control Commands and Updates
Command Command Description Command Data Example
Number
01 Source Changed 1 - CD, 2 - SPDIF1, 3 - SPDIF2 #3,01,2\r - SPDIF 2 selected
04 Input Word Width 16 to 24 bits, <=20 bits, <=24 bits #3,04,20\r - Word width is 20 bits
05 Input Sampling Frequency 32, 44.1, 48, 88.2, 96, 176.4, 192 or
Unlocked #3,05,48\r - Sampling frequency is 48 kHz
06 Digital Output Changed 1 - DSP Upsample #3,06,2\r - Pass through selected
2 - Pass Through
08 Digital Output Word Width 16, 20 or 24 #3,08,20\r - Output set to 20 bits
11 Digital Output Sampling Frequency 48, 96 or 192 #3,11,192\r - Output set to 192 kHz
14 Power State Changed 0 - Standby, 1 - On #3,14,0\r - 840C now in standby
15 LCD Brightness Changed 0 - Off, 1 - Dim, 2 - Bright #3,15,2\r - LCD set bright
16 Playing No Data #3,16,\r - Playing
17 Paused No Data #3,17,\r - Paused
18 Stopped No Data #3,18,\r - Stopped
19 Track Skipped Forward No Data #3,19,\r - Track skipped forward
20 Track Skipped Backward No Data #3,20,\r - Track skipped backward
21 Searching Forward No Data #3,21,\r - Searching forward
22 Searching Backward No Data #3,22,\r - Searching backward
23 Search Stopped No Data #3,23,\r - Search stopped
24 Track Number Selected 01 to 99 #3,24,10\r - Track number now 10
25 Open / Close Toggled No Data #3,25,\r - Open / close toggled
26 Random Toggled No Data #3,26,\r - Random toggled
27 Remain Toggled No Data #3,27,\r - Remain toggled
28 Repeat Toggled No Data #3,28,\r - Repeat toggled
29 Program Toggled No Data #3,29,\r - Program toggled
30 Intro Toggled No Data #3,30,\r - Intro toggled
31 Space Toggled No Data #3,31,\r - Space toggled
32 A-B Toggled No Data #3,32,\r - A-B toggled
33 Digital Dither Changed 0 - Off, 1 - On #3,33,0\r - Digital dither off
34 Play / Pause Toggled No Data #3,34,\r - Play / pause toggled
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 Setup Commands
Command Command Description Command Data Example
Number
01 Main Software Version X.X #4,01,1.2\r - Software is version 1.2
02 DSP Software Version XX.XXX #4,02,01.051\r - Software is version 1, build 51
03 Protocol Version X.X #4,03,1.6\r - Protocol is version 1.6
04 Digital Input Name Changed 1 to 2, Name #4,04,2,DAB \r - Input 3 named 'DAB'
Note - Name will be 10 characters
1.4.5 Group 5 – Error Messages
Command Command Description Command Data Example
Number
01 Command Group Unknown No Data #5,01,\r - Command group error
02 Command Number in Group Unknown No Data #5,02,\r - Command number error
03 Command Data Error No Data #5,03,\r - Command 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 2008
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