Embedded Applications Requiring A Window - Symbol MINISCAN MSXX04 Integration Manual

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)
Symbol Parallel To Conveyor Movement
Figure 2-11
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.
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.
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.
page 2-13 outlines the suggested window properties.
Scan Beam
Table 2-3 on