IDTECK SRK101 Hardware Manual page 11

8-2 4bit and 8bit Burst Output Format (Keypad)
1. Data Format
(4bit Burst output format)
Keypads
0
1
2
3
4
5
(8bit Burst output format)
Keypads
0
1
2
3
4
5
2. Timing Diagram
Data 1
5V
3.5V
0.5V
0V
Data 0
5V
3.5V
0.5V
0V
Binary Hexa
0
0000
1
0001
2
0010
3
0011
4
0100
5
0101
Binary Hexa
11110000 F0
11100001 E1
11010010 D2
11000011 C3
10110100 B4
10100101 A5
100uS
1mS
11
Keypads Binary
6
0110
7
0111
8
1000
9
1001
ESC
1010
ENT
1011
Keypads Binary
6 10010110
7 10000111
8 01111000
9 01101001
ESC 01011010
ENT 01001011
100uS
100uS
Hexa
6
7
8
9
A
B
Hexa
96
87
78
69
5A
4B