HandHeld Entertainment SV Series manual Picket Fence Direction, Bad Reflectance Profile

Page 43

Bad Reflectance Profile

Bar code signal amplitude out of range; above yellow line and also off the graph.

Bar code low reflectance points not in straight, consistent values.

Picket Fence Direction

In picket fence travel direction, a bar code is in the laser beam throughout the height of the shortest bar in the code. An easy way to estimate the fastest speed the code can travel through the beam is to divide the height of the shortest bar in the code by the maximum time required for the SV unit to take five scans of the code. For example: Calculate the maximum travel speed where the shortest bar height in a code is .5 inches and the SV model being used performs a minimum of 100 scans/analyses per second. Five scans requires 50 milliseconds (.05 seconds) to gather, so .5 inches (bar code height) divided by .05 seconds (time needed to gather 5 scans) = 10 inches/second. Therefore, the maximum speed the code can travel through the beam is 10 inches per second.

Vertical distance between bar codes is also a speed consideration in picket fence direction. The SV Series must have five continuous scans where no bar code is detected to reliably exit a bar code when operating in the standard operation mode set by Command ~HO1. Assuming 100 scans per second minimum, this means the vertical distance between the codes must take at least 50 milliseconds to pass through the laser beam. Calculate the maximum speed by measuring the shortest vertical space between bar codes on a label (or between labels.) Divide this distance by .050 (seconds). The result is the fastest speed the codes can move through the beam. If the application travel speed cannot be met due to a short vertical distance between codes, Command ~HO2 can be used to cause the SV to exit on a change in data rather than detecting no bar code.

Quick Check® SV Series User’s Guide

5 - 7

Image 43

Contents User’s Guide Disclaimer FCC Class B Compliance Statement Statement of Agency ComplianceCanadian Notice SV Series Use with UL-listed Equipment Statement of RoHS ComplianceLaser Beam Enclosure Description Laser SafetyPage Table of Contents Scanner Setup ISO Parameter Grade Thresholds Technical Specifications Chapter a SV Series Setup Hints Scanning Distance and Angle Introduction Quick Check SV SeriesSV100 SV Series Model SpecificationsScanView Software Laser BeamConnector Reset ButtonControl Panel Sync Inputs + 5 VDC Power InputIsolated Sync Input Diagram Envelope Sync Mode Edge Sync ModeOutput Ports Communication Sync CommandsCalibration LED Power/Sync LEDIndicator LEDs 1 System DisplaysSerial Port Transmission Format Serial Port ConnectorSerial Port Specifications Serial Port Pin-outPos Chars Parameters + or indicating sign of avg. max. bar Symbology Identifier Table UPC-A Quick Check SV Series User’s Guide ScanView Software Installation ScanView Installation and SetupSystem Requirements PC Communication Port Setup Menu Bar Screen Display Setup MenuSoftware Operation Warnings Title Bar Screen DisplayLadder Mode and Picket Fence Mode Select SymbologiesStatic Codes Mode Moving Codes ModeSupport Menu Advanced MenuAbout Menu Item Erase Current Session Data Speed Button Bar Screen DisplayAll Data Points, Last 64 Data Points ZoomModes Of Operation Transmit SV CommandsSession Mode Session Mode NotesAnalysis Screens Reflectance Profile ModeBar Code Analysis Screen Bottom Panel Bar Code Analysis ScreenGraph Display Area Bar Code Analysis Results for a Previous Bar CodeRight Panel Reflectance Profile Screen Color CodingReflectance Profile Screen Scanner Setup Scanner Positioning Bar Code Travel Direction SV Scanner/Verifier Setup ProcedureBar Code Travel Speed Considerations Quick Check SV Series User’s Guide Quick Check SV Series User’s Guide Good Reflectance Profile Bad Reflectance Profile Picket Fence DirectionLadder Direction Picket Fence Bar Code Positioning SpecificationsSetting Ladder Mode Scanning Length Using ScanView Software CalibrationProcedure Adjusting Scanner Gain and Offset Desired Signal Amplitude and Placement Quick Check SV Series User’s Guide Data Match Commands B SV Command LanguageCheck for specific data ~BCa##bc…bbb……mmm……bbb…… etc. up to 32 characters max~ Brnbb .. + Define increment or decrement data check ExamplesDecrementing Examples Incrementing ExamplesDiagnostic Commands D Relationship Between ~BC and ~Br CommandsGet the Scan Rate Example return using ScanView Hardware Configuration Commands H~HB# ~HO# Operational Mode Example return using ScanView inputted ~HB5Display the verifier parameters ~HQ# Transmission ModeQuick Check SV Series User’s Guide ~Hdx01nnn Sets scanner gain or offset ~LA## Overall passing grade Label Setup Commands L~LD## Passing percent decode ~LE# ~LFxy Analyze special subsymbology parameters~LL ~LI# Include the specified symbology for a labelQuick Check SV Series User’s Guide ~LQ# Enable or Disable Port Activations by Partial Decodes ~LT# Sync Input Source ~LS## Set minimum number of scans for valid read~LX# Sync Type ~LV## Output Interface Mode~LZ## Set Number of Codes per Label i.e., per sync period ~OS# Set Transmission Data Format Output Mode Selection Commands O~PBpiiaaabbb Port barcode decision block parameters Output Port Setup Commands PIDs Analysis Low High Units Parameters Value PCS IDs Description Low Value High Value ~PPpiiaaa Port action parametersPort State PASS/FAIL Parameters Indicator Digit Value ~PR#### Port/LED reset stateIndicator System Control Commands SChecking SV Status with ~HT How to Set Up Single Scan Operation~SK# Communication Sync Execute the calibration procedureDisable Verification Enable VerificationRaster Check Set the number of scans for Software Commanded Read ModeOperation Description ~SN###~Sh## Set the high target reflectance value for calibration Reset the System~Sl## Set the low target reflectance value for calibration Data Transmission Example ~Ssxy Command ExampleOutput Interface Modes Descriptions Mode 00 ~LV00~Stx Program Command Indicator Header ~Stx Command Example ~St5Mode 01 I/O operation Mode 01 ~LV01Mode 01 LED Operation SV Commands Important to Mode Mode 02 I/O operation Mode 02 ~LV02~LV02 Mode 02 LED Operation~LQ0 Mode 12 ~LV12 Mode 03 ~LV03Mode 12 I/O operation ~LV12 Mode 12 LED Operation~LDxx Mode 16 I/O operation Mode 16 ~LV16~LV16 Mode 16 LED Operation~PP801xxx ~PB811xxxyyy Operation Mode 17 ~LV17LED Operation SV Commands Important for Mode~LV17 ~PB815xxx000 Mode 18 ~LV18 LED Operation ~LV18 ~PB806xxx000 Mode 19 ~LV19 ~LV19 ~LDxx Mode 20 ~LV20 ISO Parameter Grade Thresholds Reference Decode Qcolvsv Series Product Specifications Technical SpecificationsParameter Specification Sync PowerScanning Performance-SV Series Model Scanner OptionsOutputs SymbologiesSync Mode Moving Bar Codes Operation ModesParameters Analyzed Sync Mode Stationary Bar CodesNo Sync Free Scan Operation Quick Check SV Series User’s Guide Quick Check SV Series User’s Guide Technical Assistance Maintenance/Customer SupportMaintenance CleaningMalaysia Product Service and RepairOnline Technical Assistance For Further Information JapanOnline Product Service and Repair Assistance Limited WarrantyQuick Check SV Series User’s Guide Setting the Proper Scan Distance Session Mode Screen Showing the X Dimension Measurement Setting the Proper Scan AngleButton Example of Good Scan Profile Examples of Scan Profile Parameters Out of Range Calibration HintsQuick Check SV Series User’s Guide Page Hand Held Products, Inc