Metrologic IS3480-00 User Manual download pdf (Page 54)

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User Manual

M37574–01T

Industrial Electronic Engineers, Inc.

23-June-2008 Rev T Page 45

QFX Quick File Transfer Protocol

QFX is a very low overhead protocol that is a much simpler and faster alternative to FTP

for moving files quickly across the network. There is no authentication. The QFX server

allows only read access to files in and below its default directory; this is the extent of

security.

QFX packets consist of a 4–byte (network order) packet length, a 4–character token,

and possibly data. Packet length includes the 4–byte length field.

Tokens are:

INFO File information request/response

SEND File send request/response

DIFF File timestamp comparison

ERRR Error response

INFO exchange:

request: [ length ][ INFO ][ filespec <NUL>]

response: [ length ][ INFO ][ YYYYMMDDhhmmss size <NUL>]

Four digits for year, two each for month (January is 01), day (01–

31), hour (00–23), minute (00–59), and second (00–59), followed

by a single space–character, and finally the size of the file, in

bytes.

response: [ length ][ ERRR ]

Requested file does not exist or request is malformed.

Explanatory message is optional, should be string consisting of

number, whitespace, optional text.

request: [ length ][ SEND ][ filespec <NUL>]

response: [ length ][ SEND ][ file data ]

response: [ length ][ ERRR ]

Requested file does not exist or request is malformed.

Explanatory message is optional, should be string consisting of

number, whitespace, optional text.

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Metrologic IS3480-00 User Manual Page 54