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Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

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232 <strong>Practical</strong> Modern <strong>SCADA</strong> Protocols: DNP3, <strong>60870</strong>.5 <strong>and</strong> <strong>Related</strong> <strong>Systems</strong><br />

8.6.5 File transfer information elements<br />

The following information elements from Table 8.15 are presented in this sub-section.<br />

Symbol<br />

FRQ<br />

SRQ<br />

SCQ<br />

LSQ<br />

AFQ<br />

NOF<br />

NOS<br />

LOF<br />

LOS<br />

CHS<br />

SOF<br />

Description<br />

File ready qualifier<br />

Section ready qualifier<br />

Select <strong>and</strong> call qualifier<br />

Last section or segment qualifier<br />

Acknowledge file or section qualifier<br />

Name of file<br />

Name of section<br />

Length of file or section<br />

Length of segment<br />

Checksum<br />

Status of file<br />

Table 8.15 Extract E<br />

Comm<strong>and</strong> information elements<br />

FRQ<br />

File ready qualifier<br />

7 6 5 4 3 2 1 0<br />

BSI<br />

U17<br />

Key<br />

UI7 Qualifier Code UI7[0..6] <br />

= Default<br />

= Reserved for further st<strong>and</strong>ard definitions<br />

= Reserved for special use (private range)<br />

BS1 Non-confirmation BS1[7] <br />

= Positive confirmation of select, request,<br />

deactivate or delete<br />

= Negative confirmation<br />

SRQ<br />

Section ready qualifier<br />

7 6 5 4 3 2 1 0<br />

BSI U17<br />

Key<br />

UI7 Qualifier Code UI7[0..6] <br />

= Default<br />

= Reserved for further st<strong>and</strong>ard definitions<br />

= Reserved for special use (private range)<br />

BS1 Not Ready BS1[7] <br />

= Section ready to load<br />

= Section not ready to load

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