Edge Sync Mode
This mode senses a signal transition level of a sync signal as shown below.
Sync sensed here
The illustration above shows the sync operation of an SV unit programmed to sense the rising edge of a sync signal in edge mode. Each time a rising edge is sensed, the SV unit does the following:
1.It verifies that at least the number of bar codes expected (programmed) since receiving the last sync input have been fully decoded. If not, a No Read condition is internally set for possible reporting through communication or output activation.
2.It begins a new interval, counting the bar codes analyzed until the next sync input is received.
3.A serial communication report is transmitted and an output port is updated per its programmed function each time a bar code is analyzed.
Envelope Sync Mode
This mode senses two transitions (leading and trailing) of the sync signal to determine when to begin and end the period for determining missing bar codes:
Sync period starts here
Sync period ends here
The illustration above shows the sync operation of an SV unit programmed to sense the rising voltage edge as the start of a sync period. The SV unit operates in this mode as follows:
1.Upon receipt of the starting edge of a sync signal, the unit begins counting the bar codes being scanned and analyzed.
2.A serial communication report is transmitted, and an output port is updated per its programmed function each time a bar code is analyzed.
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