104
•
Operational Reference
Linea2 5GigE Series Camera
IEEE 1588 Reference Resources
For additional information: https://standards.ieee.org/
PTP Standard Reference: IEEE Std 1588-2008
—
IEEE Standard for a Precision Clock
Synchronization Protocol for Networked Measurement and Control Systems
Examples using Timestamp Modulo Event for Acquisitions
The Timestamp Modulo event is used to synchronize multiple camera acquisitions and automate
re
petitive acquisitions based on either the camera’s internal Timestamp counter or a system
-wide
PTP counter. The Linea2 internal Timestamp clock has a 1
μs
tick, while the PTP clock has 8 ns
ticks (PTP: IEEE1588
–
Precise Time Protocol).
Both Timestamp counters increment continuously but can be reset to zero with
timestampControlReset if ptpMode = Off, else only the internal camera Timestamp counter resets.
Case Examples Overview
The following case examples use a simplified Timestamp timeline, which for clarity is shown with
time ticks from 00 to 60 without units. A timeline scale based on real time is not required to
describe the concepts. These examples also apply equally to using an internal Timestamp clock or a
system PTP clock.
Case 1: Simple Repeating Acquisitions as Upcoming Events
Conditions:
•
initial timestampControlReset resets Timestamp counter
•
timestampModuloStartTime at 20
•
timestampModulo = 10
•
timestampModuloActualStartTime = First Event generated (F1)
After the Timestamp Reset, the first acquisition is made when the Modulo reaches the +10 tick
Timestamp count, following the programmed start time. Acquisitions repeat every +10 Timestamp
tick until stopped.
00
10
20
30
40
50
60
R
es
et
St
ar
t
Ti
m
e
A
ct
u
al
S
ta
rt
T
im
e
F1
F2
F3
F4
Figure 68: Case 1 - Repeating Acquisitions as Upcoming Events
