Basler raL2048-48gm User Manual download pdf (Page 37)

AW00118302000 Basler Network Drivers and Parameters

Basler racer GigE 27

4.2 The Basler Performance Driver

The Basler performance driver is a hardware specific GigE Vision network driver compatible with

network adapters that use specific Intel chipsets. The main advantage of the performance driver is

that it significantly lowers the CPU load needed to service the network traffic between the PC and

the camera(s). It also has a more robust packet resend mechanism.

For more information about compatible Intel chipsets, see the installation and Setup Guide for

Cameras Used with Basler’s pylon API.

The performance driver uses two distinct "resend mechanisms" to trigger resend requests for

missing packets:

 The threshold resend mechanism

 The timeout resend mechanism

The mechanisms are independent from each other and can be used separately. However, for

maximum efficiency and for ensuring that resend requests will be sent for all missing packets, we

recommend using both resend mechanisms in a specific, optimized combination, as provided by

the parameter default values.

The performance driver’s parameter values determine how the resend mechanisms act and how

they relate to each other. You can set the parameter values by using the pylon Viewer or from within

your application software by using the pylon API.

The Basler performance driver uses a "receive window" to check the status of packets. The check

for missing packets is made as packets enter the receive window. If a packet arrives from higher in

the sequence of packets than expected, the preceding skipped packet or packets are detected as

missing. For example, suppose packet (n-1) has entered the receive window and is immediately

followed by packet (n+1). In this case, as soon as packet (n+1) enters the receive window, packet

n will be detected as missing.

The parameter default values will provide for the following:

 The threshold resend mechanism precedes the timeout resend mechanism.

This ensures that a resend request is sent for every missing packet, even at

very high rates of arriving packets.

 The timeout resend mechanism will be effective for those missing packets

that were not resent after the first resend request.

We strongly recommend using the default parameter settings. Only users

with the necessary expertise should change the default parameter values.

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Basler raL2048-48gm User Manual Page 37