Symbol MiniScan MS-120X, Руководство по интеграции

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5-5
MS-220X Specifications
Typical symptoms of these environments are:
• Frequent scanner resets
• Scanner occasionally loses power (due to host initiated shutdown)
• Occasional host lockups.
Because multi-interface Miniscan Plus products are often exposed to these environments
due to the nature of scanner placement, they have been safeguarded as much as possible
to prevent physical damage. Despite design precautions, testing has shown that some USB
hosts cannot tolerate these environments. In this case, try placing a self-powered USB hub
close to the host, between the scanner and host, as a buffer to the host against the harsh
environment. This may not be a valid solution in all cases.
Technical Specifications
Table 5-3 provides the MS-220X technical specifications
Table 5-3. MS-220X Technical Specifications @ 23°C
Item Description
Power Requirements
Input Voltage
Scanning Current
Standby Current
MS-2204
MS-2207
V
cc
Noise Level
5.0 VDC ± 10%
250 ± 30 mA typical
25 ± 5 mA typical
45 ± 5 mA typical
200 mV peak-to-peak max.
Laser Power 0.95 mW ± 0.1 mW,
λ
= 650 nm nominal
Scan Frequency: Horizontal 320 Hz ± 5 Hz
Scan Frequency: Vertical 282 Hz ± 5 Hz
Scan Rate 640 scans/sec.
Print Contrast Minimum 35% absolute dark/light reflectance differential
Frame Rate 24 frames/sec. 12 Hz ±1 Hz (vertical)
Skew Tolerance ± 15
o
from plane parallel to symbol
(see Figure 5-3 on page 5-8 )
Pitch Angle ± 30
o
from normal (see Figure 5-3 on page 5-8 )