Motorola SYMBOL MINISCAN MSXX04 - Manual (Page 36)

2 - 12 Symbol MiniScan MSXX04 Series Integration Guide
Symbol is Parallel to Conveyor Movement
With the symbol bars parallel to the conveyor belt direction (ladder presentation) the relationship is:
V = (R x H) / N
where: V = Velocity of the conveyor (inches/second)
R = Scan Rate of scanner (see technical specifications)
H = Symbol height
N = Number of scans over symbol (minimum of 10 scans)
Figure 2-11 Symbol Parallel To Conveyor Movement
Example
Use the previous formula to calculate the number of scans for a specific bar code, scanner, and conveyor speed; a
minimum of 10 scans per symbol is recommended.
R = 640 scans/sec
H = 60 mil
N = 10 scans
V = (640 x .060) / 10 = 3.84 in./sec
Embedded Applications Requiring a Window
Use the following guidelines for applications that require a window in front of the MiniScan.
Window Material
Many window materials that look perfectly clear can contain stresses and distortions that can reduce scanner
performance. For this reason, only optical glass or cell-cast acrylic with an anti-reflection coating is highly
recommended. Following is a description of acrylic, and CR-39, another popular window material.
Table 2-3 on
page 2-13 outlines the suggested window properties.
Scan Beam
Direction of Con
veyor Parallel to Symbol
H=Symbol Height
NOTE Motorola does not recommend placing an exit window in front of the MiniScan; however, the following
information is provided for applications that require such a window.