Duplex Scanning

The duplex scanning is extension of simplex mode scanning.

For duplex scanning, SET WINDOW command must specify front side window (window identifier 00h) and back side window (window identifier 80h) in window descriptor. SCAN command is required to invoke duplex mode scanning by sending window identifier 00h, 80h in data out phase. READ command is issued to read image data sequentially front window and back window. In the READ command, window identifier field must be specified in data type qualifier field to distinguish which side of window data is read. When front image data is completely read, back image data can be read in this scanner.

1

2

RESERVE UNIT

SET WINDOW(ID:00h,80h)

SEND

OBJECT POSITION

(Load Object)

SCAN(ID:00h,80h)

READ(ID:00h)

READ(ID:80h)

OBJECT POSITION

(Unload Object)

RELEASE UNIT

Reserve exclusive use of the scanner.

Specify window parameters for front side(00h) and back side(80h). The window parameters must be sent in one SET WINDOW command.

Send "Halftone Mask" and/or "Gamma Function" data, if required.

Feed document into ADF. This command is omissible because SCAN or READ command automatically feeds in a document.

Start scanning operation. This command is required to specify duplex mode scanning. The window identifiers should be sent in 00h, 80h order for future extention.

Transfer front side(Data Type Qualifier:0000h) image data from scanner. READ command would be issued one or more. The details of READ command sequence is 4.9.5.

Transfer back side(Data Type Qualifier:0080h) image data from scanner. READ command would be issued one or more. The details of READ command sequence is 4.9.5.

Feed out document from ADF. This command is omissible because end of scanning automatically feeds out document.

Release exclusive use of the scanner.

1This loop is used to scan a batch of document.

2This loop is used to scan a batch of identical format, window parameter document at maximum speed.

3-116

M3099GX/GH OEM Manual