SCAMAX
®
2600/4000
Tech. Manual 06/2002
T-68
3.14 Description of Scan Routine Flow
The scan routine is initiated by the PC via the scanner interface (DPU, HiScan or dunord) or via the inbuilt
SCSI-Interface. Originally, of course, the operator and the user program issue the command.
First the scan status is tested. If, since the last scan process, a document has passed through the
scanner unchecked the scanner issues a „Paper not scanned“ (E4) message. The „No Paper“ (E0) error
message is issued if the paper sensor hasn't detected any paper or if the start switch has not been
depressed.
If no error is present the stepper motor is started if it is not already running. The magnetic clutch is
engaged and the feed belts pull in a document. If the ultrasound double feed detector senses a double
feed before a document reaches the scan area (image window of the CCD) the motor is stopped and the
error message „Doublefeed“ (E3) is issued.
The error message „Timeout“ (E1) is issued if the document does not reach the scan area within 7.5
seconds.
As soon as at least 256 pixels in a line have a grey level above the H-Gate threshold (default value is
100) the clutch is disengaged and the scan process proper starts. Image data are then received by the
SCSI interface or scanner interface in the PC.
At the scan mode default setting (with length check) the selected number of lines (for example 2,400 lines
for A4) will be transmitted.
When the number of lines, plus an offset of for example 50 lines, has been reached a check is made
whether there is more paper in the scan area. If there is paper present for more than two seconds the
motor is switched off and the error message „Paper jam“ (E5) is issued.
If paper is present for less than two seconds the condition is classed as "only" oversized, which can have
several reasons. The error message „Oversize“ (E2) is issued in this case.
The length check can be turned off via the software. In that case only the number of lines appropriate for
the document size are transmitted. A black line or stripe across the document can, in this mode, cause a
scan end since the paper recognition only sees black. In this mode a „Paper jam“ is only recognised after
10 seconds have elapsed.
If the ultrasound double feed detector has responded during the scan process the error message
"Doublefeed" (E3) is issued after scanning has ended.
If no error where detected during the scan process „Ready“ (8A) will be issued.
Summary of Contents for SCAMAX 2600
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Page 16: ...SCAMAX 2600 4000 Tech Manual 06 2002 T 16 Illustration of optical reduction...
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