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IR Remote Control
Hex Codes and Signal Timing
Guide to Hex Codes and Signal Timing for
Extron IR Remote Controls
68-1323-01
Rev. A
10 06
Hex codes
1 2 3
4
8
9
10 11 12 13
14 15 16 17
18 19 20 21
22 23 24 25
26 27 28 29
30 31 32 33
34 35 36 37
38 39 40 41
42 43 44 45
6
5 7
Looking up the Hex Code
To find the hex codes for your individual Extron IR remote
control, match your button positions with those in figure 1, then
look up the corresponding button number in the hex code table
(e.g., button #15 [arrowed] has the hex code 0E).
N Your remote control will not have all the buttons shown.
Figure 1 below covers the button combinations of all
available Extron IR remote models.
Hex Code Table
(See left for button position)
Button # Hex Code
1 00
2 01
3 02
4 03
5 04
6 05
7 06
8 07
9 08
10 09
11 0A
12 0B
13 0C
14 0D
15 0E
16 0F
17 10
18 11
19 12
20 13
21 14
22 15
23 16
24 17
Figure 1 — IR Remote buttons and corresponding
transmitted hex codes
Explanation of Signal Timing
A complete command signal is made of a lead pulse, followed
by 32 bits (4 bytes) of data, and a repeat pulse as long for as the
button is held. The first two bytes contain the Extron device
address (which is 00H FFH), the third byte contains the hex
coded data (see the table above), and the fourth byte is the
inverse of the third byte. The repeat pulse is sent to allow the
receiver to know that the button is still being held.
Button # Hex Code
25 18
26 19
27 1A
28 1B
29 1C
30 1D
31 1E
32 1F
33 40
34 41
35 42
36 43
37 44
38 45
39 46
40 47
41 48
42 49
43 4A
44 4B
45 4C
IR Remote Control Hex Codes and Signal Timing • Hex Codes
1
Signal Timing
Carrier Frequency = 38 KHz
(50% duty cycle)
9 ms
4.5 ms
Carrier On
Carrier On
Carrier Off
Carrier Off Carrier On Carrier Off
0
0
F
F
9 ms
0.56 ms
2.5 ms
Tf = 108 ms Tf = 108 ms
Lead Code
1st Frame
Repeat Code
0.56 ms
Lead Code
Repeat Code
Repeat Code
Bytes 1-4
Bit “0”
1.125 ms
0.56 ms
Bit “1”
2.25 ms
Bit Description
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
Code
Inverse Code
Device Address
Byte 1
Byte 2
9 ms
4.5 ms
Lead Code
Code
Inverse Code
1st Frame
0 0 0 0 1 1 1 0
1 1 1 1 0 0 0 1
0
E
1
F
Device Address
Byte 1
Byte 4
Byte 3
Byte 2
Data Bits Transmitted
Hex Code Equivalent
0
0
F
F
0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1
Example
The figure below shows the transmitted signal to represent a
single press of button #15.
General Signal Timing with Code Positions
IR Remote Control Hex Codes and Signal Timing • Signal Timing
2
Extron Electronics, USA
1230 South Lewis Street
Anaheim, CA 92805
USA
714.491.1500
Fax 714.491.1517
Extron Electronics, Europe
Beeldschermweg 6C
3821 AH Amersfoort
The Netherlands
+31.33.453.4040
Fax +31.33.453.4050
Extron Electronics, Asia
135 Joo Seng Road, #04-01
PM Industrial Building
Singapore 368363
+65.6383.4400
Fax +65.6383.4664
Extron Electronics, Japan
Kyodo Building
16 Ichibancho
Chiyoda-ku, Tokyo 102-0082 Japan
+81.3.3511.7655
Fax +81.3.3511.7656
www.extron.com
© 2006 Extron Electronics. All rights reserved.
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