Nano-5G Series GigE Vision Camera
Operational Reference
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131
Overview of Precision Time Protocol Mode (IEEE 1588)
PTP Mode = Precision Time Protocol
•
The PTP protocol synchronizes the Timestamp clocks of multiple devices connected via a switch
on the same network, where the switch supports PTP.
•
For optimal clock synchronization the imaging network should use one Ethernet switch. Daisy-
chaining multiple small switches will degrade camera clock syncs.
•
Additionally the Ethernet switch connecting cameras to the imaging network should implement
“PTP Boundary Clock” hardware.
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To use a multi-port NIC adapter or computer with multiple NIC ports instead of a switch, that
multiport NIC must be capable to be configured as the common Master PTP source for all its
networks. Such a configuration requires using the multi-
port NIC’s configuration software.
•
Genie Nano-5G cameras can automatically organize themselves into a master-slave hierarchy,
or the user application configures a camera master with n-number of slaves. The auto-
configuration process typically happens within 2 seconds.
•
The automatic organizing procedure is composed of steps (as defined by IEEE 1588) to identify
the best clock source to act as master. When only Nano-5G cameras are used, since they are
equal, the last selection step is to identify the Nano-5G with lowest value MAC address to be
the clock master.
•
The feature
TimeStamp Source
is automatically changed to
IEEE1588
when
PTP Mode
is
enabled. This timestamp tick (in ns) cannot be reset by the user.
•
The Genie Nano-5G cameras implement additional features designed to synchronize multiple
camera acquisitions via IEEE 1588 (PTP Mode)
–
not via external camera trigger signals.
PTP Master Clock Identity
The clock ID of the current best master is an Extended Unique Identifier (EUI)-
64 “64
-bit
ID”,
converted from the 48-bit MAC address, by inserting 0xfffe at the middle of the MAC address.
•
The standard MAC address in human-friendly form is six groups of two hexadecimal digits as
this example shows (excluding spaces)
: “0a 1b 2c 3d 4e 5f”
•
The Extended Unique Identifier format is (excluding spaces)
: “0a 1b 2c fffe 3d 4e 5f”
An Example with two Nano-5G Cameras
The following basic steps configure two Nano-5G cameras connected to one computer via an
Ethernet switch, configured with two instances of CamExpert, to grab a frame every second,
controlled by a modulo event via PTP.
For each camera set features as follows:
I/O Controls
—
select Trigger Mode=ON, Tigger Source=Timestamp Modulo Event
Event Controls
—
select PTP Mode=Automatic
•
Note how one Nano-5G automatically becomes Master while the other becomes Slave
Event Controls
—
to have a modulo event every second, set Timestamp Modulo
Event=1000000000
Click Grab on each instance of CamExpert. With the two cameras aimed at the same moving
object, you see that each camera grabs a frame at the same time.
Summary of Contents for Genie Nano-5G Series
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Page 180: ...178 Contents Nano 5G Series GigE Vision Camera Cable Assembly G3 AIOC BLUNT2M ...
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