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Product Data
Bulletin 2755
Single/Dual-Head Enhanced Bar Code Decoders
12
Discrete I/O Conditions
The Primary Match Code Counters and Outputs are triggered by a number of
different events or conditions. These include:
Verifying that a symbol or group of symbols was read or failed to be read
S
Read or No-Read.
Comparing scanned data to pre-configured data stored in the Match Code
Table
S
Match Entry – Scanned data matches a specific table entry.
S
Match Complete – Scanned data matches a user-defined number of
entries.
S
Read and No-Match – Scanned data does not match any table entry
S
No-Read or No-Match – Either no symbol data was decoded (perhaps
due to a damaged or missing label) or the decoded data did not exist in
the table.
Configuring the Match Code Table by scanning bar code symbols
S
Autoload – Allows the scanned data from the first package read to be
automatically entered into the match code table. Subsequent matches
to the original data will activate outputs.
S
Autoload Input – Allows an operator to load new data into the match
code table by activating a discrete input module (through a push
button, key switch, or PLC output for example), and scanning a bar
code symbol.
Monitoring host communication flow to throttle product flow and prevent
data loss
S
Buffer Full – Indicates that the decoder's host communications buffer
is filling faster than data is being taken by the host. Output can be
used, for example, to slow a conveyor.
S
Buffer Overflow – Indicates that the host communications buffer was
unable to store all the incoming data. Can be used to shut down a line
until communications are restored, preventing further data loss.
The parameter None disables the output, or can be used as a "dead man"
switch (with normally closed contact) to indicate power loss or other
problem with the decoder.
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