MESSAGE FORMATTING
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6
6.2 MESSAGES FROM GUN COMMAND KEYS
The DRAGON™ M series guns with display have 3 command keys that can each be
associated with a character to send to the host.
By pressing the keys on the gun, the associated character with its relative message
formatting is sent to the Host. For example, keys can be used to select items from a
menu sent to the gun display by the application program.
The general format is:
[Header] [Gun_Addr] [Gun_Addr_delimiter] ] [Cradle_Addr] [Cradle_Addr_delimiter]
[Time stamp] [Ts_delimiter] [Code ID] [Code Length]
KeyID
[Terminator]
[Items in square brackets are optional.]
The messages are handled by the system as if they were barcodes, that's why
KeyID
can have so many fields appended to it. If in your application there is some chance of
reading a 1-char barcode identical to
KeyID, the way you can distinguish between
the two is to enable the Code ID: The
KeyID is the only 1-character long EAN 8
code.
Refer to par. 5.3 for a compete description of the optional message fields in square
brackets.
The default characters associated with each key (
KeyID) are shown in the following
table:
Default Key Identifiers
Key KeyID
▲ (left) Key '<'
ENTER
(center) Key '='
▼ (right) Key '>'
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