User`s manual

146 • Troubleshooting Genie HM Series-GigE Vision Camera
data from cameras. Genie cameras support the IEEE 802.3x pause frame flow control protocol
automatically, therefore the solution is to use an Ethernet switch that supports flow control. See "
IEEE
802.3x Pause Frame Flow Control" on page 128 for additional information.
Other Problems or Issues
This section describes problems that do not fit any of the categories above. Typically these are issues found in the
field under specific or unusual conditions.
Random Invalid Trigger Events
Do not change the exposure time while grabbing, else an Invalid Trigger Event may be generated. This applies to
any exposure mode or trigger source. The Invalid Trigger Event is not catastrophic and only indicates the loss of a
video frame. Stopping acquisitions first will avoid this error.
Minimum Sapera Version Required
Save User Configuration Failed: An unusual error that occurred with no other Genie control problem. The
solution is to verify the minimum Sapera version used with the Genie Framework. The Genie HM requires Sapera
version 6.20 or later. The Genie Monochrome or Color require Sapera version 6.10 or later. Sapera 7 or later is
required for any Genie installation with a computer running 64-bit Windows.
Sapera Disconnect-Reconnect Events are Lost
The GigE Vision server regularly polls for devices via GigE Vision DISCOVERY_CMD (Auto-Discovery). Genie
cameras that are connected or disconnected generate Sapera events (EventServerAccessible /
EventServerNotAccessible – see SapManager::RegisterServerCallback) for use by the application to identify
cameras connected to a subnet. Polling is necessary because if Ethernet switches are used to connect multiple
cameras, a real-time interrupt event message system is not possible.
The Auto-Discovery interval is set by default to 15 seconds (see "
System Information, Configuration" on page 98).
If multiple camera disconnect / reconnect events occur between the polling interval, those events are lost. If an
application must account for all events, the polling interval should be shortened when an Ethernet switch is used.
But increased polling increases network traffic and the polling interval may not be short enough to guarantee that all
quick camera disconnect /reconnects events will be seen.