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5.1.1.2
PTP (IEEE 1588-2008:Precision Time Protocol）
Table 3. Specifications
Equipped functions
Used Transport
Destination
number
Multicast address
Synchronized item
PTP Time Data
(Comply with IEEE
1588)
Camera Time Stamp
Applicable
Message
GigE Vision proper
regulation
Note1: If there is IEEE 1588 master clock in the network, the camera time stamp is
synchronized at the master clock.
If there is no IEEE1588 master clock in the network, the camera time stamp
operates by the free running of the internal clock at starting on the power being ON.
Note2: In GenICam standard, 64-bit integer is handled as signed value, thus only 63 bits are
available through GenICam interface.
Note3: As 1GHz clock is not actually operated, the time stamp is incremented by 8
(1GHz/125MHz) on every 1 clock of actual frequency.
5.1.1.3
Manifest
EL-2800-GE2 equips Manifest, both GenICam Version 1.x and Version 2.0 are applied by selecting the
entry. EL-2800-GE2 has three entries and two entries are for Ver.1/Ver.2 and third one is ready for
future extension.
EL-2800M-GE2 / EL-2800C-GE2
Only slave
Multicast UDP datagram
But, Delay_Req and
Delay_Resp are Unicast
UDPdatagram
Port
Event message: 319
General mesage:320
224.0.1.129
Time only
bit length
80bit
bit length
64bit
(Note2)
PTP
Announce message
Sync message
Follow_Up message
Delay_Req message
Delay_Resp message
Timestamp Tick Frequency register value is fixed at 1,000,000,000
(1GHz). (Note 3)
While PTP synchronizing operation, Timestamp Reset function is
disabled and if the reset is required, GEV_STATUS_WRITE_PROTECT
status code is returned.
Master function is not equipped
In
IEEE1588,
including Ether Frame are defined. In
GigE Vision 2.0, it is defined to use
UDP datagram.
Sync, Delay_Req, Pdelay_Req,
Pdelay_Resp
Announce, Follow_Up, Delay_Resp,
Pdelay_Resp, Management, Signaling
Frequency synchronization is not
equipped
Time with 1 ns unit increment
starting at 00:00:00 on 1/1/1970
At PTP synchronization, LSB64bit of
PTP time data
At PTP non-synchronization, 1ns unit
increment at starting on any time
(Note 1)
Receiving only
Receiving only
Receiving only (used if the master is
2 step clock)
Sending only
Receiving only
- 15 -
various
transport
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