Microscan MS-710, User Manual, Page: 155 / 186

Appendices
MS-710 Scanner User’s Manual
A-15
Appendix
Appendix F — MS-Sensor
Note: The MS-Sensor is an optional FIS feature.
The MS-Sensor is a patented specular sensor that interprets reflected light from the
laser beam. Once adjusted to your environment, it indicates why the scanner might fail
to decode a symbol within the triggered read cycle and outputs the appropriate mes-
sage to you. The following three conditions are possible:
• the object’s symbol is defective (you receive a bad bar code message)
• there is no bar code on the object (you receive a no bar code message)
• there is no object (you receive a no object message)
To properly configure the MS-Sensor, you must first enter the extended decode rate test
to view the readouts for reflectance (REF) and transitions (TRANS), the number of sym-
bol bar and space transitions. These readouts are the basis for configuring Reflectance
Threshold and Transition Counter, which affect the MS-Sensor’s operation.
Note: Prior to beginning the extended decode rate test, make sure that the lighting
conditions are equivalent to what they will be during normal operations and that the
sensor’s field of view is clear of all objects that are not to be sensed.
a) To begin the extended decode rate test, enter <Ce> .
The extended decode rate test also displays decode rate and symbol data (if any exists) as
well as reflectance and transition readings.
As shown in figure A-5 on page A-16 , the results for Transition Counter and
Reflectance Threshold is sensed from directly in front of the scanner at an optimum
detection range of 3 inches for diffused objects and 5 inches for specular objects.
Reflectance Threshold
Number of Symbol Bar
& Space Transitions
Symbol Informa-
tion
Decode Rate
per Second
* Example shows output when Postamble is enabled and defined as a carriage return and a line feed.
347 Decodes/Sec 0071486026624 REF= 0 TRANS= 38
488 Decodes/Sec 0071486026624 REF= 0 TRANS= 37
488 Decodes/Sec 0071486026624 REF= 0 TRANS= 37
447 Decodes/Sec 0071486026624 REF= 0 TRANS= 33