Allied Vision Technologies Pike Manual de Instruções descarregar pdf (Página 153)

Description of the data path

PIKE Technical Manual V4.0.0

153

How to transfer parameters to the camera

The following 3 variants of transferring the parameters are available with the

firmware 3.x:

In the following you find a short description of each variant:

Encapsulated Update (begin/end)

The Encapsulated Update (begin/end) has the following characteristics:

• Host will set a parameter update begin flag in the camera

• Host will send several parameters to the camera and then signalize end

by resetting the flag

• All parameters will become active for the same next image

• Dependent on timing mode, the camera

– (standard Update): uses the previous parameters until the update

flag is reset

–(Quick Format Change Mode): waits until the update flag is reset.

In the Encapsulated Update (begin/end) the exact sequence is:

1. Parameter update begin (advanced feature register)

2. Standard IIDC register update (1..N register) (standard feature register)

3. Parameter update end (advanced feature register)

Transfer mode

Advantage ☺ Disadvantage 

Encapsulated Update (begin/

end)

☺ easy to use (standard quad

writes in camera register is

possible)

 one write access per register

access

Parameter-List Update ☺ only one write access for all

parameters

☺ fastest hostcamera transfer

(from 5 parameters on faster

than encapsulated mode)

☺ handling of parameter list

easy

 not so easy to use (block

writes)

 max. 64 entries for parameter

list

Standard Update (IIDC) ☺ compliant with IIDC V1.31  non deterministic change of

parameters

Table 54: Comparison of 3 transfer modes

1 2 ... 148 149 150 151 152 153 154 155 156 157 158 ... 331 332

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