NCR RealScan 7802, User Manual

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NCR RealScan 7802 Price Verifier User Guide
06/03 497-0425530 Release E 42 of 94
•
Number of responses from the host to product information queries. Maximum
value is 4294967295. Includes positive and negative response.
•
Number of times the unit received no response from the server. Maximum
value is 4294967295.
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
permits 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
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, white space, 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, white space, optional text.
Request
[ length ][ DIFF ][ filespec <NUL>][ YYYYMMDDhhmmss<NUL>]