Message Signal Type Text

Setup an ASCII text signal by setting the Signal Type pulldown to Text in the Edit Signal dialog (Figure 1). Use the dialog to select the Start Byte and Length of the signal in the message.

Some limits are placed on this dialog to help prevent mistakes. The Text signal position is byte aligned, so the Bit Position field is disabled. The Text signal length is a multiple of 8 bits, so the Bits Length pulldown list is limited to those choices.


Figure 1: Use the Edit Signal dialog to set the location of a text signal in a message.

ASCII Conversion Table

Table 1 is a lookup table to convert between ASCII character, decimal, and hexadecimal values. One byte represents one ASCII character. Vehicle Spy will automatically convert text signals, but this table may be helpful in certain situations.

Table 1: ASCII Conversion Table

Character Name Char Dec Hex Character Name Char Dec Hex
Null NUL 0 $00 At Sign @ 64 $40
Start of Heading SOH 1 $01 Capital A A 65 $41
Start of Text STX 2 $02 Capital B B 66 $42
End of Text ETX 3 $03 Capital C C 67 $43
End of Transmit EOT 4 $04 Capital D D 68 $44
Enquiry ENQ 5 $05 Capital E E 69 $45
Acknowledge ACK 6 $06 Capital F F 70 $46
Bell BEL 7 $07 Capital G G 71 $47
Back Space BS 8 $08 Capital H H 72 $48
Horizontal Tab TAB 9 $09 Capital I I 73 $49
Line Feed LF 10 $0A Capital J J 74 $4A
Vertical Tab VT 11 $0B Capital K K 75 $4B
Form Feed FF 12 $0C Capital L L 76 $4C
Carriage Return CR 13 $0D Capital M M 77 $4D
Shift Out SO 14 $0E Capital N N 78 $4E
Shift In SI 15 $0F Capital O O 79 $4F
Data Link Escape DLE 16 $10 Capital P P 80 $50
Device Control 1 DC1 17 $11 Capital Q Q 81 $51
Device Control 2 DC2 18 $12 Capital R R 82 $52
Device Control 3 DC3 19 $13 Capital S S 83 $53
Device Control 4 DC4 20 $14 Capital T T 84 $54
Negative Acknowledge NAK 21 $15 Capital U U 85 $55
Synchronous Idle SYN 22 $16 Capital V V 86 $56
End of Transmit Block ETB 23 $17 Capital W W 87 $57
Cancel CAN 24 $18 Capital X X 88 $58
End of Medium EM 25 $19 Capital Y Y 89 $59
Substitute SUB 26 $1A Capital Z Z 90 $5A
Escape ESC 27 $1B Left Bracket [ 91 $5B
File Separator FS 28 $1C Backward Slash \ 92 $5C
Group Separator GS 29 $1D Right Bracket ] 93 $5D
Record Separator RS 30 $1E Caret ^ 94 $5E
Unit Separator US 31 $1F Underscore _ 95 $5F
Space (blank) 32 $20 Back Quote ` 96 $60
Exclamation Point ! 33 $21 Lower-case A a 97 $61
Double Quote " 34 $22 Lower-case B b 98 $62
Pound/Number Sign # 35 $23 Lower-case C c 99 $63
Dollar Sign $ 36 $24 Lower-case D d 100 $64
Percent Sign % 37 $25 Lower-case E e 101 $65
Ampersand & 38 $26 Lower-case F f 102 $66
Single Quote ‘ 39 $27 Lower-case G g 103 $67
Left Parenthesis ( 40 $28 Lower-case H h 104 $68
Right Parenthesis ) 41 $29 Lower-case I I 105 $69
Asterisk * 42 $2A Lower-case J j 106 $6A
Plus Sign + 43 $2B Lower-case K k 107 $6B
Comma , 44 $2C Lower-case L l 108 $6C
Hyphen / Minus Sign - 45 $2D Lower-case M m 109 $6D
Period . 46 $2E Lower-case N n 110 $6E
Forward Slash / 47 $2F Lower-case O o 111 $6F
Zero Digit 0 48 $30 Lower-case P p 112 $70
One Digit 1 49 $31 Lower-case Q q 113 $71
Two Digit 2 50 $32 Lower-case R r 114 $72
Three Digit 3 51 $33 Lower-case S s 115 $73
Four Digit 4 52 $34 Lower-case T t 116 $74
Five Digit 5 53 $35 Lower-case U u 117 $75
Six Digit 6 54 $36 Lower-case V v 118 $76
Seven Digit 7 55 $37 Lower-case W w 119 $77
Eight Digit 8 56 $38 Lower-case X x 120 $78
Nine Digit 9 57 $39 Lower-case Y y 121 $79
Colon : 58 $3A Lower-case Z z 122 $7A
Semicolon ; 59 $3B Left Brace { 123 $7B
Less-Than Sign < 60 $3C Vertical Bar | 124 $7C
Equals Sign = 61 $3D Right Brace } 125 $7D
Greater-Than Sign > 62 $3E Tilde ~ 126 $7E
Question Mark ? 63 $3F Delete DEL 127 $7F
Character Name Char Dec Hex Character Name Char Dec Hex

  Spy Documentation - (C) Copyright 1997-2022 Intrepid Control Systems, Inc.