Crestron Forum

The B&O protocol has 5 periods that are all a multiple of 3125 uS. IR uses a fixed 200 uS on duration. Wired MCL (Master Control Link) uses an on duration of half the period.

A code begins with two T1 one bits to set AGC and a start bit, it ends with a stop bit. Repeated codes repeat the entire code including the start and stop bits.

Consecutive 0 or 1 bits are not allowed! The 'same as last' code must be used for repeated 0 or 1 data bits.

For example the code 1010111000011 would be sent as:

T1 T1 T5 T3 T1 T3 T1 T3 T2 T2 T1 T2 T2 T2 T3 T2 T4
AGC St 1 0 1 0 1 1 1 0 0 0 0 1 1 Sp

T1 0 3125 uS
T2 Same as last 6250 uS
T3 1 9375 uS
T4 Stop 12500 uS
T5 Start 15625 uS

The carrier frequency for IR is exactly 455 kHZ. The B&O IR receivers are sensitive and *very* selective. They use 455 kHz ceramic filters (same as an AM radio) to achive high selectivity. It is important to have a precise carrier frequency for maximum range. B&O remotes all use a crystal that is a multiple of 455 kHz (3.64 MHz for example) or a 455 kHz resonator.

All unidirectional codes have 17 (mostly) or 20 (very few) data bits. Bidirectional codes are longer and have many different lengths. This document describes unidirectional codes only. Most B&O equipment from circa 1985 to present will respond to 455 kHz unidirectional codes.

Each code has a single link bit, 8 or 11 device code bits, and 8 key code bits.

17 (11h) bits: l dddd dddd kkkk kkkk
20 (14h) bits: lddd dddd dddd kkkk kkkk

When one of the device selection keys is pressed (Radio, TV, etc...) the device code is changed for the general purpose keys.

For example selecting the RADIO will send 11:00181. Then VOL Up will send 11:00160. (length:code in hex)
If the TV is then selected, code 11:00080 will be sent and VOL Up will now send 11:00060.

The Volume keys will always use device code 000 or 001, the other general purpose keys will used the exact set device code.

For example selcting V.TAPE will cause the volume keys to use device code 000, but the other keys will use device code 005.

Device Codes (only)
----------------------------
11:000 Video
11:001 Audio
11:005 V.TAPE
11:00F All
11:01B Light
11:01D SP.DEMO
11:01E Link OPTION
11:100 Link Video
11:101 Link Audio
11:105 Link V.TAPE
11:11B Link Light
14:129 V.TAPE2
14:929 Link V.TAPE2

Device selection codes
------------------------------------------
11:000 80 TV
11:000 82 AUX2, V.AUX
11:000 86 DVD, CDV
11:000 87 CAMCORD, CAMERA
11:000 88 TEXT
11:000 8A SATELLITE, SAT, DTV
11:000 8B PC
11:000 8D DOORCAM

11:001 81 RADIO
11:001 83 AUX, A.AUX
11:001 91 TAPE1, A.TAPE, A.MEM
11:001 92 CD
11:001 93 PHONO, N.RADIO
11:001 94 TAPE2, A.TAPE2, N.MUSIC
11:001 97 CD2

11:005 85 V.TAPE, V.MEM

11:01B 9B LIGHT

11:01D 89 SP.DEMO

11:100 80 LINK + TV
11:100 82 L-V.AUX
11:100 86 L-CDV
11:100 8A LINK + SAT

11:100 BF LINK-AV

11:101 81 LINK + RADIO
11:101 91 LINK + A.TAPE
11:101 92 LINK + CD
11:101 93 L-PHONO
11:101 94 L-A.TP2
11:101 97 L-CD2

11:105 85 LINK + V.TAPE

11:11B 9B LINK + LIGHT

14:129 85 V.TAPE2. DVD2

14:929 85 L-V.TP2

Most keys do not repeat. The POWER key will repeat once (code sent twice). The Volume Up/Down keys repeat with the same code (Y). A few other keys will send a code once when pressed (D), and then repeat with an other code while held down (H).

KEY CODES:

Hex Dec Rpt Key
-----------------------------------------------------------------------
00 0 - 0
01 1 - 1
02 2 - 2
03 3 - 3
04 4 - 4
05 5 - 5
06 6 - 6
07 7 - 7
08 8 - 8
09 9 - 9
0A 10 - CLEAR
0B 11 - STORE
0C 12 Y(1) (Red Dot), POWER, System Off
0D 13 - MUTE
0E 14 - RESET, INDEX

1E 30 D STEP (R), Up
1F 31 D STEP (L), Down
20 32 - GO TO, TUNE, COUNTER, SETUP, TRACK, PAGE

28 40 - CLOCK

2A 42 - FORMAT

32 50 D <<, Left
33 51 - RETURN, SUBCODE
34 52 D >>, Right
35 53 - PLAY, LAMP, REVEAL
35 53 D GO
36 54 - STOP
37 55 - RECORD, UPDATE

3F 63 - SELECT

44 68 - SPEAKER, SOUND
45 69 - PICTURE
46 70 - TURN, SOUND, MONO

48 72 - LOUDNSS

4D 77 - BASS
4E 78 - TREBLE
4F 79 - BALANCE

58 88 - LIST (Enter and EXIT)

5C 92 - MENU

60 96 Y ^ (Vol Up)

64 100 Y v (Vol Dn)

70 112 H <<, Left
71 113 H >>, Right
72 114 H STEP (R), Up
73 115 H STEP (L), Down

75 117 H GO
76 118 H Green
77 119 H Yellow
78 120 H Blue
79 121 H Red

7F 127 - EXIT

80 128 - TV
81 129 - RADIO
82 130 - AUX2, V.AUX
83 131 - AUX, A.AUX

85 133 - V.TAPE
86 134 - DVD, CDV
87 135 - CAMCORD
88 136 - TEXT
89 137 - SP.DEMO
8A 138 - SATELLITE, SAT
8B 139 - PC

8D 141 - DOORCAM

91 145 - TAPE1, A.TAPE
92 146 - CD
93 147 - PHONO
94 148 - TAPE2, A.TAPE2

97 151 - CD2

9B 155 - LIGHT

BF 191 - AV

C0 192 - SHIFT 0, EDIT
C1 193 - SHIFT 1, RANDOM
C2 194 - SHIFT 2
C3 195 - SHIFT 3, REPEAT
C4 196 - SHIFT 4
C5 197 - SHIFT 5
C6 198 - SHIFT 6
C7 199 - SHIFT 7
C8 200 - SHIFT 8, TRACKNG, LARGE
C9 201 - SHIFT 9, MIX

D4 212 D Yellow
D5 213 D Green

D8 216 D Blue
D9 217 D Red

E9 233 - OPTION 0
EA 234 - OPTION 1
EB 235 - OPTION 2
EC 236 - OPTION 3
ED 237 - OPTION 4
EE 238 - OPTION 5
EF 239 - OPTION 6
F0 240 - OPTION 7

F7 247 - STAND

FA 250 - PIP

FA 82 - P-V.AUX

------------------------------------------------------

OPTION settings codes

Device code == 000 (Video), 001 (Audio) or 01E (Link) only!
Key code == E9 (0) to F0 (7)

Option 0 No IR reception
Option 1 Two IR-receivers in the same room
Option 2 One IR receiver in the main room
Option 4 Link room product connected to one or two main room products in the same room
Option 5 Two IR receivers in the same room link
Option 6 One IR eye in the link room