Appendix A. Characters and Keys

Table A-1. ASCII characters

Decimal code

Hex code

Character

Description

0

00

NUL

Null

1

01

SOH

Start of heading

2

02

STX

Start of text

3

03

ETX

End of text

4

04

EOT

End of transmit

5

05

ENQ

Enquiry

6

06

ACK

Acknowledge

7

07

BEL

Audible bell

8

08

BS

Backspace

9

09

HT

Horizontal tab

10

0A

LF

Line feed

11

0B

VT

Vertical tab

12

0C

FF

Form feed

13

0D

CR

Carriage return

14

0E

SO

Shift out

15

0F

SI

Shift in

16

10

DLE

Data link escape

17

11

DC1

Device control 1

18

12

DC2

Device control 2

19

13

DC3

Device control 3

20

14

DC4

Device control 4

21

15

NAK

Negative acknowledge

22

16

SYM

Synchronous idle

23

17

ETB

End transmission block

24

18

CAN

Cancel

25

19

EM

End of medium

26

1A

SUB

Substitution

27

1B

ESC

Escape

28

1C

FS

File separator

29

1D

GS

Group separator

30

1E

RS

Record separator

31

1F

US

Unit separator

32

20

Space

Space in text

33

21

!

Exclamation point

34

22

"

Double quote

35

23

#

Number or pound sign, hash, octothorp

36

24

$

Dollar sign

37

25

%

Percent sign

38

26

&

Ampersand

39

27

'

Single close-quote, apostrophe

40

28

(

Left parenthesis

41

29

)

Right parenthesis

42

2A

*

Asterisk

43

2B

+

Plus sign

44

2C

,

Comma

45

2D

-

Hyphen / minus

46

2E

.

Period

47

2F

/

Slash

48

30

0

The number zero

49

31

1

The number one

50

32

2

The number two

51

33

3

The ...

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