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NCR RealScan 7802 Price Verifier User Guide
06/03
497-0425530 Release E
76 of 94
send an error token following re-establishment of the connection in order to log the
error on the server. If the server detects this condition, it can log it directly.
Following a query, the client may choose to take an error action if it receives nothing
from the server within a defined timeout period.
Status Requests
The server can make capability queries and/or mode changes before, after, or in lieu of
sending any response. The client may send capability messages regardless of whether
the key name is known to the server; the server retains this information. When the
server needs to know the value of one of these capabilities, it consults this retained
information. If it is not known, a capability query may be sent and the server may wait a
moment for a reply to be received. This reply asynchronously updates the server’s
information, and the value should be found there by a subsequent lookup following the
brief interval required for the client to respond to the query. If it remains undefined, it
can be assumed that the client declined to respond, most probably because that
capability name is not known to it.
Client Mode Changes
The notion of a mode setting is to permit the server to select between optional behaviors
or parameters in the client. If the server wants the client to adopt a certain mode setting,
it sends the command. The client does so, if applicable. If not, optionally, an error report
may be generated in response. Mode values are set by using token-value pairs. Mode
values can be queried by sending the mode name alone. Error reports are used
primarily as a debugging tool. The string starts with an error number, optionally
followed by white space and explanatory text.
Packet Types
Packet Types
Data Types
Function
Token
Function
Token
Terminate connection
TERM
No Operation
NOP_
Capability query
CAPQ
Display Text
TEXT
Capability response
CAPR
Special Text
1
SPEC
Mode Set/Query
MDSQ
UNC
UNC_
Mode Response
MODR
URL
URL_
Error report
ERR_
File
FILE
Product query
PROD
Data
DATA
Registration
RGST
Event
EVNT
1
The meaning of any Special Text is implementation–defined.
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