A.4 Commands

(2)Response

This scanner reports as follows:

a. Normal:

Status:

B’00000’ (GOOD)

Sense key: X’0’ (NO SENSE)

b.Abnormal:

Status:

B’00001’ (CHECK CONDITION)

Sense key: X’0’, X’2’, X’3’, X’4’, X’5’, X’6’, or X’B’

A.4.7 SET WINDOW command

The following table shows the normal sequence of the SET WINDOW command when used with this scanner.

Step

Bus phase

Initiator operation

← →

Target operation

 

 

 

 

 

1

BUS FREE

Verifies bus free

 

 

 

 

 

 

 

2

ARBITRATION

Obtains bus-usage

 

 

 

 

right

 

 

 

 

 

 

 

3

SELECTION

Selects target

 

 

 

 

 

 

 

 

 

 

Drives BSY signal

 

 

 

 

 

4

(MESSAGE OUT)

Selects logical unit

 

 

 

 

 

 

5

COMMAND

Specifies SET

Sets window

 

 

WINDOW (CDB)

 

 

 

 

 

 

 

6

DATA OUT

Specifies window

 

 

 

data

 

 

 

 

 

 

 

7

STATUS

 

Reports GOOD status

 

 

 

 

 

8

MESSAGE IN

 

Reports message

 

 

 

 

(Command Complete)

 

 

 

 

 

 

 

 

 

Releases BSY signal

 

 

 

 

 

9

BUS FREE

 

 

 

 

 

 

 

 

Appendix A-49