Prosoft-technology AN-X-AMX Bedienungsanleitung PDF herunterladen (Seite 26)

Page 22 AN-X-AMXCAPT January 2008

For I/O updates the destination is 255 (broadcast) since all drops see updates to and from

all other drops.

Example: The following equation selects frames with destination 255.

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Dst = 255

Frame Control, Ctl

The second byte of the frame is the frame control, Ctl, which identifies the type of frame.

Possible values are:

Value

Symbolic name

Description

CTL_INIT_REQ

Init request

CTL_INIT_RSP

Init response

CTL_TOKPASS

Token pass

CTL_ACK

Acknowledge

CTL_TOKRET

Token return

CTL_UPDTOSLV

I/O update to slave drop

CTL_UPDTOMAS

I/O update to master

CTL_MSG

Directed message

The symbolic names can be used in the equation.

Mask off the upper bits of the CTL byte before using them in comparisons.

Example: The following equation selects frames that consist of updates to slaves or to

the master.

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((CTL&0x0F)=CTL_UPDTOSLV) OR ((CTL&0x0F)=CTL_UPDTOMAS)

Frame Drop

On I/O updates to or from the master, the third byte in the message is the frame drop. On

updates from the master, the frame drop is the drop being updated with output data. On

updates to the master, the frame drop is the drop sending the input data.

Example: The following equation selects frames that are I/O updates from drop 2 to the

master

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Prosoft-technology AN-X-AMX Bedienungsanleitung Seite 26