Explanation:
When this command is received, the scanner starts a scanning
operation (image reading) for the specified reading area, and sends the
image data to the host computer as data blocks.
Image data of one line (one main scan of data) is sent as a data block,
and a data block is sent for each sub scan reading length.
When the computer receives a data block, it should send an
ACK
code to indicate that it has accepted the data block and to prompt the
scanner to send the next data block. If the computer fails to send an
ACK
code within 30 seconds after it receives a data block, an
interface error occurs in the scanner.
When the computer receives the last data block (the last line of the
image), it should not send the
ACK
code. If it sends an
ACK
code
after the last data block, a command error occurs in the scanner.
Note:
❏
After accepting the last data block, the host computer should not
send an
ACK
code to the scanner.
❏
The area end flag of the status byte is set to 1 in the last data
block.
Aborting a scanning operation
Scanning can be aborted by sending a
CAN
code in place of an
ACK
code after the computer receives a data block.
When the
CAN
code is received, the scanner returns an
ACK
code in
response, then terminates the remaining scanning operation.
3-16
Command Reference
Summary of Contents for EMP-TW 1000
Page 4: ...iv ...
Page 11: ...Introduction Introduction 1 ...
Page 14: ...4 Introduction ...
Page 36: ...Halftone mode C None Dither mode A Dither mode B Dither mode C Dither mode D 1 22 Overview ...
Page 39: ...Chapter 2 Command Usage 2 Command Usage 2 1 ...
Page 72: ...Color page scanning Use when sending color page data 2 34 Command Usage ...
Page 95: ...Chapter 3 Command Reference 3 Command Reference 3 1 ...
Page 131: ...Parameter range Default value i 00H center Command Reference 3 37 ...
Page 157: ...Command Reference 3 63 ...
Page 163: ...Appendix A Interface Specifications A Interface Specifications A 1 ...
Page 182: ...A 20 Interface Specifications ...
Page 183: ...Appendix B Scanner Model Technical Data B Scanner Model Technical Data B 1 ...
Page 268: ...B 86 Scanner Model Technical Data ...