Technical information

AVT GigE camera attributes

AVT GigE Camera and Driver Attributes V1.3.1

This document is a master document for all AVT GigE camera models and is NOT camera specific

PayloadSize – Unit32 – R

Total size of payload in bytes.

•If ChunkModeActive = TURE:

PayloadSize = TotalBytesPerFrame + NonImagePayloadSize + 8

•If ChunkModeActive = FALSE:

PayloadSize = TotalBytesPerFrame

PTP

Precision Time Protocol (PTP) manages clock synchronization of multiple

devices across an Ethernet network, with ±1 μs tolerance. Once the clocks of the

devices are synchronized, a synchronous software trigger can be sent to AVT

cameras via the PtpAcquisitionGateTime control. On AVT GigE cameras, the

device clock is represented by the camera TimeStampValue attribute.

PtpAcquisitionGateTimeHi – Uint32 – R/W

Upper 32 bits of PtpAcquisitionGateTime. Used to schedule a synchronized

“software trigger” on multiple PTP synchronized devices. Must be set beyond

current camera TimeStampValue, i.e., TimeStampValue >= PtpAcquisitionGa-

teTime. When set below TimeStampValue, image acquisition stalls. PtpAcqui-

sitionGateTime resets to zero when PtpMode set to Off.

PtpAcquisitionGateTimeLo – Uint32 – R/W

Lower 32 bits of PtpAcquisitionGateTime. See PtpAcquisitionGateTimeHi.

PtpMode – Enum – R/W

Controls the PTP device behavior.

Units: Bytes

www



For more information on PTP, see the IEEE 1588-2008 standard:

http://standards.ieee.org/findstds/standard/1588-

2008.html

Range: [0 – (2

-1)]

Default: 0

Units: Camera clock ticks*2

Range: [0 – (2

-1)]

Default: 0 Units: Camera clock ticks

Note



If using the camera event channel, a EventPtpSyncLost is sent

if PtpMode is changed. EventPtpSyncLocked is sent once PTP

synchronization is reestablished.

Off [Default] This device’s TimeStampValue is not synchronized with

any other device. PtpAcquisitionGateTime resets to zero

Slave This device’s TimeStampValue is altered to align with a master

device‘s clock