RF627, RF627Smart [Revision 2.1.2] 20.09.2021
Laser Scanners
35
20.2. Synchronization diagram
Block diagram of the synchronization module:
The source of synchronization events is selected by the
Sync Source selection
selector (multiplexer).
For external synchronization modes (
External
), the divider and sync delay (
Divider
,
delayer
) are available, as well as a special counter called the
Encoder counter
, which
provides uni- or bi-directional pulse counting at inputs #1 and #2. In addition, the encoder
counter can count the pulses of the internal high-speed generator (10 MHz) if the inputs are
set to operate according to level, and not according to the rise or fall. The encoder counter
value is latched at the moment of the synchronization event and transmitted along with the
profile.
The synchronization scheme also includes the measurements counter (
Measures
counter
), which counts the performed measurements.
All counters (except
Packets counter
) can be reset by an external or internal signal
(for example: by input #3, by timer, by program request, etc.).
Notes:
1. The maximum processed frequency at inputs #1, #2 and #3 is 10 MHz. If the
event arriving rate is higher than the FPS, the measurement is started at the closest
synchronization event after the end of the current cycle. The minimum allowable pulse
duration is 40 ns. When using the input divider (
Divider
), the frequency of the events,
triggering the measurement, equals to (input frequency) / (divider value).
2. The data packet with the profile coordinates, transmitted by the scanner (see the
Developer Guide), contains information about the contents of several cyclic counters:
·
System time counter for the beginning of each measurement.
·
Input pulse counter (
Encoder counter
). This counter is incremented by the input
signal (or input signals). The counter can work in reverse. The indication of the
direction is transmitted in the data packet.
·
Measurements counter (
Measures counter
). This counter is incremented by the
synchronization event.
·
Packets counter. This counter is incremented when sending a UDP packet with a
profile.
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