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3-6
LS 1220 Product Reference Guide
Usable Scan Length
The decode zone is a function of various symbol characteristics including density, print
contrast, wide-to-narrow ratio, and edge acuity. Width of decode zone at any given distance
must be considered when designing a system. Calculating The Usable Scan Length
Method on page 2-5, provides a detailed description of how to calculate the usable scan
length. The scan angle is provided in Table 3-1 on page 3-2.
Table 3-2. LS 1220-I300A Decode Distances
Symbol Density/
Bar Code Type/
W-N Ratio
Bar Code
Content/
Contrast
Note 1
Typical Working
Ranges
Guaranteed Working
Ranges
Near
Far
Near
Far
5 mil
Code 39; 2.5:1
ABCDEFGH
80% MRD
3.5 in.
8.89 cm
6.0 in.
15.24 cm
3.0 in.
7.62 cm
5.0 in.
12.70 cm
7.5 mil
Code 39; 2.5:1
ABCDEF
80% MRD
2.5 in.
6.35 cm
10.0 in.
25.40 cm
2.75 in.
6.98 cm
9.0 in.
22.86 cm
10 mil
Code 39; 2.5:1
FGH
80% MRD
2.0 in.
5.08 cm
15 in.
38.1 cm
2.5 in.
6.35 cm
13 in.
33.02 cm
15 mil
Code 39; 2.5:1
ABCD
80% MRD
2.0 in.
5.08 cm
20 in.
50.8 cm
2.5 in.
6.35 cm
19 in.
48.26 cm
20 mil
Code 39; 2.2:1
123
80% MRD
*
Note 2
29.0 in.
73.66 cm
*
Note 2
21.0 in.
53.34 cm
40 mil
Code 39; 2.2:1
AB
80% MRD
*
Note 2
40.0 in.
101.60 cm
*
Note 2
30.0 in.
76.20 cm
55 mil
Note 4
Code 39; 2.2:1
CD
80% MRD
*
Note 2
45.0 in.
114.30 cm
*
Note 2
36.0 in.
91.44 cm
Notes:
1. CONTRAST measured as Mean Reflective Difference (MRD) at 670 nm.
2. Near ranges on lower densities (not specified) are largely dependent upon the width of the
bar code and the scan angle.
3. Working range specifications at ambient temperature (23 °C).
4. Reflective Symbol.
Содержание LS 1220
Страница 2: ...LS 1220 Product Reference Guide ...
Страница 3: ......
Страница 4: ...LS 1220 Product Reference Guide 70 12072 03 Revision A January 2003 ...
Страница 23: ...1 8 LS 1220 Product Reference Guide Figure 1 3 LS 1220 Connector ...
Страница 33: ...2 10 LS 1220 Product Reference Guide ...
Страница 71: ...8 14 LS 1220 Product Reference Guide Figure 8 1 Hardware Handshaking ...
Страница 97: ...9 6 LS 1220 Product Reference Guide Code Lengths cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Страница 105: ...9 14 LS 1220 Product Reference Guide Prefix Suffix Values cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Страница 108: ...9 17 Parameter Menus UPC Security Zone cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
Страница 114: ...9 23 Parameter Menus Parity Set the type of parity for RS 232C transmission ODD EVEN MARK SPACE NONE ...
Страница 118: ...9 27 Parameter Menus ASCII Data Format Select either 7 bit or 8 bit ASCII format for RS 232C communications 7 BIT 8 BIT ...
Страница 120: ...9 29 Parameter Menus Intercharacter Delay cont d 1 2 3 4 5 6 7 8 9 0 CANCEL ...
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