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Product Data
Bulletin 2755
Single/Dual-Head Enhanced Bar Code Decoders
6
Discrete I/O Modules
The decoders support an optional I/O Module Board (eight positions for
outputs with one position alternately accepting an input). With the optional
I/O modules, the decoder can be used to control external AC or DC devices.
Conditions that activate the outputs are under user control via the
configuration screens or host commands.
All positions accept an output module. Position 8 also excepts an input
module. You can configure the decoder to automatically load scanned bar
code data into the match code table. The input module (in position 8) can be
used to reset the autoload data without using host commands or the
configuration terminal.
Each decoder has two conduit holes or optional connectors for wiring
the I/O modules.
The I/O Module Board is available in several variations for factory or
customer installation. You can order the decoder with the I/O Module Board
only, for customer installation of specific modules, or with 2 DC outputs and
1 DC input for "out of the box" applications. Each option is listed under the
Accessories sections.
Memory Backup
The decoders are designed to retain configuration during short term power
interruptions. Controlled discharge of an on-board capacitor supports
configuration retention for 6 hours at an ambient temperature of 50_C
(122_F), or 50 hours at 30_C (86_F). The capacitor accumulates a charge
when power is restored.
An optional battery (catalog number 1747-BA) may be used to retain the
configuration without outside power for up to five years. When the optional
battery is used, power interruptions (whether intentional or resulting from
power supply "glitches") will have no affect on operating memory.
If the battery is not used, long term power loss (see above) will result in the
loss of the Extended Match Code Table configuration, the Primary and
Extended Match Code Counters, and the text examples contained in the Host
Replacement Rules. Note that the Replacement Rules themselves will not be
lost, but the test examples you have entered at the bottom of each rule page
will be lost.
Storage memory configuration is transferred into operating memory on
restart if power is lost for a period longer than the on-board capacitor (and, if
installed, optional battery) can support.
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