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Bulletin 2755
Single/Dual-Head Enhanced Bar Code Decoders
8
Decode Modes
The Single and Dual-Head Decoders have three decode modes:
Continuous Mode
In continuous mode, the decoder attempts to decode every scan.
Continuous mode is useful during initial setup to determine the optimum
location of the scanner relative to the bar code labels. In this mode, the
on-line performance indicator shows the percentage of valid scans.
Continuous/Unique Mode
This mode is similar to continuous mode except the decoder compares
each new valid read to the previous valid read. If they are identical, the
new data is discarded so that only unique data is transmitted to the host.
Triggered Mode
In triggered mode, the decoder uses one of the following trigger sources
to initiate decoding:
Host Command. The trigger source is a command generated by a host
computer or programmable controller.
Package Detect. The trigger source is a package detector connected to the
scanner.
Internal Timer. The trigger source is an internal timer that cycles the
trigger on and off at a set time interval.
Once triggered, the decoder continuously decodes bar codes until one of
the following conditions occurs:
Number of symbols (bar codes) per package count is satisfied.
Trigger off command (stop scan character) received from host.
Package detect signal is no longer present.
No-read timer expires.
In the triggered mode, you can configure the decoder to send information
to a host device and/or operate the discrete outputs:
Immediately After Valid Package
This response mode sends decoded data to the discrete I/O and host
immediately after the decode operation.
This response mode is useful in high speed applications where maximum
throughput is required.
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