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Quick Check® SV Series User’s Guide 2 - 5
3. Counting ceases upon receipt of the trailing edge of a sync signal. The SV
Series determines that at least the number of bar codes expected
(programmed) during the sync period have been fully decoded. If not, an
internal No Read condition is set for possible reporting through
communication or output activation.
4. The SV unit then waits for the next leading edge of a sync signal to begin
counting codes being scanned and analyzed.
Note: For best performance in either sync mode, mount the SV unit in a location
where a bar code is not in the laser beam when an active edge signal is
received.
Communication Sync Commands
Sync operation can be accomplished through serial communications. Please
see the ~SK# (page 6-26) command for details.
Output Ports
Five programmable output ports are available on I/O connector pins 5, 6, 7, 8,
and 15. Each port can be programmed to activate on practically any combination
of data and analysis parameters (including “good codes”) analyzed by the SV
Series. Port activation logic and parameters are programmed via the output
interface modes and associated commands. See the "Output Interface Modes
Descriptions" on page 6-30 for details.
Each port’s output is an open drain FET (field effect transistor). Therefore, the
port can either be “ON” (sinking current) or “OFF” (no current/open circuit). The
active polarity determines whether the port is “ON” or “OFF” while active. This
type of output circuit is used because it is flexible for field connections. The
diagram below shows an example circuit diagram of one output port.
From SV output logic
To appropriate output
pin 5, 6, 7, 8, or 15
To SV ground
Open Drain FET Output Diagram