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 capability of the NIC. If the NIC is set to Jumbo Frames (9014), it is recommended to set the Packet Size in the registry to 8192 (0X2000). This will allow 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 usec. 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. It is normal when using laptops and other low end PCs to set this value much higher between 60,000 and 75,000. See notes below for further explanation. One Camera per NIC Ideally, each camera will have its own NIC.
In this case, on an IPC with NICs tuned for GigE cameras, 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. Multiple Cameras per NIC If you have multiple cameras going into one NIC, they will all need to share the NIC bandwidth. In this case, the Interpacket Delay must be set high enough so each camera has a chance to send its packets at the same time as the others. A jumbo packet takes 65 usec to transfer. If you have two cameras, you will need to set Interpacket delay for Using Sentech STC-M Cameras with AutoVISION and Visionscape Page 12 of 35