Axis AX-906 Uživatelská příručka stáhnout pdf (Strana 15)

Multi-Axis

Control

CHAPTER

4.

APPLICATION DESIGN

71

Device-specific

commands

require

that

a device

address

precede them.

The

AX

will

not

execute a devtce-speciflc

command

if

there

is

no

device

address

preceding

the

command.

or

if

the

device

address

setting

in

the

AX

does

not

match

the

address

preceding

the

command.

Universal

commands

do

not

require device identifiers preceding

them.

A

universal

command

with

no

device

address

will

be

executed

regardless of

the

address

setting

of

the

AX.

If

a device

address

does precede a universal

command.

it will only

be

executed

by

an

AX

set

to

that

particular

address.

The E (Enable RS-232 communication)

and

F (Disable RS-232

communication)

commands

are

useful

in

a

daisy

chain

for

locking

out

particular

indexers

from

responding

to

universal

commands

with

no

preceding device

address.

NOTE:

The

F command.

will

keep the

AXfrom

executing

any

commands

(except the E command)

sent

to

it

over

the RS-232C

interface.

but

will

not

prevent

the

commandJrom

being

echoed.

For

Example.

to

lock-out

the

AX

unit

set

to device

address

1.

so

that

universal

commands

are

only executed

by

the

AX's

set

to

address

2

and

3.

the

following

step

is perfonned:

•

Send

the

IF

command

over

the

RS-232C

communication

line. locking

out

the

AX

at

device

address

1.

All

universal

commands

(with

no

preceding device address)

will now

be

executed only

by

the

AX's

at

Device

addresses

2

and

3. Entering a

2F

command

in

addition to

IF

command

would allow only

the

AX

at

device

address

3

to

execute

universal

commands

with

no

preceding device

address.

This

ellminates

the

need

to precede every

command

intended

for a

specific

AX

(in

this

case.

the

AX

at

device

address

3)

with a

device address.

Sending

an

E

command

over

the

RS-232C line

will re-enable all drives previously

disabled

with

the

F

command. Preceding

the

E

command

with

a device

address

will re-enable only

the

AX

set

to

that

particular

device

address.

When

using

the

XU

command

to upload

the

contents

of a

specified

sequence

from

an

AX

in

a daisy-chain.

it

is

necessary

to disable all

the

drives

in

the

chain

that

come

after

the

drive being queried with

the

F

command

(as described

above).

This

will

prevent

subsequent

drives from executing

the

commands

being

sent

back

to

the

tenninal.

See

the

XU

command

description

in

Chapter

5. Software

Reference.

For

daisy-chain

wiring

instructions.

refer

to

Chapter

2.

Getting

Started.

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