Control Code Handshaking Procedures; Control Code Without Parameters; Control Code With Parameters - Epson FilmScan 200 Service Manual

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FilmScan 200

1.4.3 Control Code Handshaking Procedures

This section describes the control code handshaking procedures.

Step 1:

Control code sent from host computer.

Step 2:

Response received from scanner.

ACK (06h): Legal control code received. (The scanner accepts the control code.)

NACK (15h): Illegal control code received. (The scanner does not accept the control code.)

Step 1:

Control code sent from host computer.

Step 2:

Response received from scanner.

ACK (06h): Legal control code received. (The scanner accepts the control code.)

NACK (15h): Illegal control code received. (The scanner does not accept the control code.)

Step 3:

When the host receives ACK, it sends parameters.

Step 4:

Response received from scanner.

ACK (06h): Legal control code received. (The scanner accepts the control code.)

NACK (15h): Illegal control code received. (The scanner does not accept the control code.)

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Figure 1-9. Control Code Handshaking (1)

Figure 1-10. Control Code Handshaking (2)

REV.-A

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