Setting Up Visionscape Registry for GigE Vision The section above described how to set up the NIC cards for each camera and to maximize NIC performance. The section below describes how to set up AutoVISION/Visionscape through the Registry to match the NIC settings and to maximize performance. Once done, AutoVISION/Visionscape will automatically program the cameras so they function correctly with these settings. 1) Setting Registry to Match NIC Card Setup The NIC cards have been set with IP Address, Subnet Mask, Packet Size, Receive Buffers and Interrupt Moderation.
Next, each camera must be set to use the correct Packet size, Interpacket Delay, as well as Line Debounce Time for the Trigger Input. This is done through the Registry. a. Open the Registry by typing “regedit” in the start menu b. Navigate to the following registry key HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Visionscape\GigEVision c. There are entries for each of the 8 cameras. d. Packet Size – By default, Packet Size is set to 1444 to account for NIC cards without Jumbo Packet setting capability. This value should be set to match the packet size setting in the NIC.
If the NIC is set to Jumbo Frames (9014), it is recommended to set the Packet Size in the registry to a value between 8192 and 9014. Note: If the registry setting is higher than the packet setting on the NIC card, the camera will not function. e. I nterPacketDelay – InterPacketDelay is the time delay inserted between sending each packet from the camera to the PC. This value is set in Ticks. Each Tick equals 0.001 μs. A low value allows the camera to reach its maximum bandwidth. By default, InterPacketDelay is set to 6000 for the Sentech STC-M cameras. There are instances however, when the PC cannot keep up with this bandwidth and packets are dropped.
In this case increasing the InterPacketDelay can be used to throttle the data and allow the PC to keep up and not drop packets. One Camera per NIC Ideally, each camera will have its own NIC. In this case, on an IPC, this value can be set as low as 1000 for one camera per channel. On a laptop, this value may need to be set as high as 75,000 to allow the PC to keep up. Using Sentech STC-M Cameras with AutoVISION and Visionscape Page 10 of 32