User manual CAMBRIDGE AUDIO 640H RS232 CONTROL PROTOCOL AND IR CODES

[. . . ] Gallery Court - Hankey Place ­ London - SE1 4BB 0207 940 2200 _______________________________________________________________ 640H RS232 Control Protocol and IR Codes _______________________________________________________________ Section 1: The RS232 Protocol Section 2: IR Remote Control Commands Gallery Court Hankey Place London SE1 4BB UK Tel: +44 (0)20 7940 2200 Fax: +44 (0)20 7940 2233 1 Document Title : Specification - 640H RS232 Control Protocol 1 The RS232 Protocol 1. 1 RS232 Communications The protocol is accessed via COM1 i. e. The default settings for COM1 is 9600baud, no parity, 8 data bits, 1 stop bit with no handshaking. 1. 2 Command Format Header Bytes: # 1 Destination / Source 1 1 Command Group 1 to 6 1 Command Number 01 to 99 2 Command Data XXXX XX Footer CR 1 CR is the carriage return character (13 decimal). 1. 3 Command Groups Command Group 1 2 3 4 5 6 7 8 Description Replies from the product Updates (events) from the product Remote control commands to the product Database commands to the product Database replies from the product Set up commands to the product Reserved Reserved Commands are split into the following groups: 2 Document Title : Specification - 640H RS232 Control Protocol 1. 4 1. 4. 1 Commands and Messages Group 1 ­ Replies from the 640H The following messages form Group 1 and are acknowledgement messages from the 640H in reponse to other commands. Command Number 01 02 03 04 05 06 Description OK Command group unknown Command number in group unknown Command data error Send software version Send protocol version Data No data No data No data No data Software version Protocol version Example #1101\r #1102\r #1103\r #1104\r TBD TBD 1. 4. 2 Group 2 ­ Updates from the 640H The following update messages (events) form Group 2 and are asynchronous messages issued by the 640H Command Number 01 02 03 04 05 06 Description Power state changed Play state changed Playing track index changed Playing track changed Playing album changed Playing artist changed Data 0 = off 1 = on 2 = standby 0 = stopped 1 = paused 2 = playing Track index within current track list Track title Album name Artist name Example #12010\r ­ about to turn off #12021\r ­ track paused #12034\r ­ playing track 4 of current tracks #1204Crazy He Calls Me\r #1205Take A Look\r #1206Natalie Cole\r 3 Document Title : Specification - 640H RS232 Control Protocol 1. 4. 3 Group 3 ­ Remote Control Commands The following commands form Group 3 and are commands to the 640H that correspond to remote control buttons. [. . . ] to build a list of album names in the "Rock" genre. 5 Document Title : Specification - 640H RS232 Control Protocol If the display being used is only 3 lines then the display device can simply hold details about the 3 items being displayed. For example, call "get next item" 3 times after a query to fill each line of the display. If the user scrolls down then scroll the display by one line and call "get next item" to fill in the blank line. If the user pages up 3 items then call "skip items" with -3 as the parameter then use "get next item" again to fill in each line etc. 1. 4. 5 Group 5 ­ Database Replies from 640H The following messages form Group 5 and are sent by the 640H in responce to commands from Group 4: Command Number 01 Description Query response (returns number of items in filtered query) Send next item Data 01 = number of genres 02 = number of artists 03 = number of albums 04 = number of tracks 05 = number of playlists 01 = genre name 02 = artist name 03 = album ID, album title 04 = track ID, duration, track title 05 = playlist ID, playlist name Example #15010119\r ­ 19 genres #150103105\r ­ 105 albums 02 #150201Rock\r #150202Santana\r #150203369, Supernatural\r #150204746, 298, Smooth\r #150205428, Party 1\r 1. 4. 6 Group 6 ­ Setup Commands The following commands form Group 6: Command Number 01 Description Set COM1 baud rate Data 0 = 2400 1 = 4800 2 = 9600 3 = 14400 4 = 19200 5 = 28800 6 = 38400 7 = 57600 8 = 115200 0 = off 1 = on No data No data Example #16014\r 02 03 04 Set COM1 CST / RTS handshake Get software version Get protocol version #16020\r #1603\r #1604\r 6 Document Title : Specification - 640H RS232 Control Protocol 2. 640H IR Remote Control Commands The 640H responds to the IR Commands shown in the table below. The commands can be received in three ways. Modulated IR signals input to the IR Emitter In socket (on the rear panel). Unmodulated positive logic TTL level commands input to the Control Bus In socket (on the rear panel). ALL commands are Philips RC5 format with a System Code of 24 Key/Button Open/close tray Standby toggle 1 2 3 4 5 6 7 8 9 Info 10 Shift Home Back Up Left Enter Right Down Album Artist Genre Playlist Track Internet Radio Skip left Play Skip right Pause Record Stop Mute Page up Page down Command Code (Dec) 45 12 1 2 3 4 5 6 7 8 9 15 10 14 20 21 34 31 47 30 35 57 58 59 60 61 62 32 53 33 48 55 54 13 26 27 2D 0C 1 2 3 4 5 6 7 8 9 0F 0A 0E 14 15 22 1F 2F 1E 23 39 3A 3B 3C 3D 3E 20 35 21 30 37 36 0D 1A 1B Command Code (Hex) 7 Document Title : Specification - 640H RS232 Control Protocol 3. [. . . ] The Cambridge Audio products may contain design defects or errors know as errata, which may cause the product to deviate from published specifications. Current characterised errata are available on request. [. . . ]