Scantron OpScan 4ES, Руководство оператора

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Chapter 4: Scanner Modes
OMR Only Mode
Operator’s Guide 49
OMR Only Mode
IMPORTANT: When running the scanner in OMR only
mode, you must configure your scanning
application to the virtual serial port to which the
scanner is connected. If you are uncertain of the
com port to which the scanner is connected, begin
with the highest available and work your way
down.
Applies To
• OpScan 4ES scanners
• OpScan 4ES with SelfScore scanners
• i NSIGHT 4ES scanners
• i NSIGHT 4ES with SelfScore scanners
Overview
OMR Only mode uses classic data collection
technology. In this mode, the scanner sends an ASCII
representation of the marks on the sheet to the
computer for each sheet scanned.
In OMR Only mode, the scanner must be connected to
a PC with Scantron software (e.g. ScanTools,
Remark
TM
, Prosper
TM
, SurveyTracker Plus
®
). The
software controls the scanner and captures the data.
When a new session is initiated, the software sends a
“scan sheet” message to the scanner and the scanner
responds by scanning a sheet. As each sheet is
scanned, the scanner reads all the cells across the
form at each timing mark. The scanner assigns a
darkness level based on a 16 level gradient to each cell
and passes this “raw” data back to the software in the
PC.
The data collection software in the PC translates the
raw data to ASCII data based on the form definition
and stores an ASCII data record for each sheet. The
process is repeated for each sheet until the operator
ends the session.