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SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-233

4.31 SEND DIAGNOSTIC Command (1Dh)

The SEND DIAGNOSTIC command directs the SDLT tape drive to perform its self-diagnostic tests.

Two levels of drive-resident diagnostic tests are available: the Level 1 Electronics Test and the Level 2

Write / Read Functionality Test.

Figure 4-126. SEND DIAGNOSTIC Command Descriptor Block — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (1Dh)

1 Self-Test Code PF (0) Rsv’d Selftst DevOfl UnitOfl

2 Reserved

3 – 4

(MSB)

Parameter List Length

(LSB)

5 Control

Table 4-135. SEND DIAGNOSTIC Command Data — Field Descriptions

Field Name Description

Self-Test

Code

Self-Test Code. Used to perform drive and medic health checks.

See

Table 4-136 on page 4-235

for specific information.

PF Page Format. Not supported. Must be set to 0.

Selftst Self Test. Used with DevOfl and UnitOfl to specify the type of testing to be

done. See Table 4-136 on page 4-235 for specific information.

DevOfl Device Offline. Used with Selftst and UnitOfl to specify the type of testing to

be done. See Table 4-136 on page 4-235 for specific information.

UnitOfl Unit Offline. Used with Selftst and DevOfl to specify the type of testing to be

done. See Table 4-136 on page 4-235 for specific information.

Parameter

List Length

For this command, always set to 0, signifying that only default parameters are

used.

SDLT 600

SCSI Interface Guide

SCSI Commands

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REV A01

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