Philips Aleron Series 2-1 Quick Operating Manual

I

SYSTEM

21

QUICK

OPERATING

GUIDE

4822

872

30319

860415

1.

INTRODUCTION

I

The aim of this guide is

to

facilitate getting started with System

21.

To

explore the

full possibilities of System

21

it

is necessary to consult the "System

21

manual",

which contains all the details.

System

21

consists of:

- one master function

-

functional units

: performs System

21

control and the communication

(transparent) with

functional units.

: perform

auxilary tasks such as switching, scanning,

1/0

etc.

SYSTEM

21

,------------------,

IE

C-625

I MAINS 1/0 1/0

1/0

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I I

IE

EE

-488

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\

I

--

A

----

---

r--

I

[ :

r--

CONTROLLER

I

MASTER

I

FUNCT

IONA

L UNITS (SLAVES)

I

SYS

TEM

21

BUS

L

__

--------------

_j

ST4701

PHILIPS

CONTENTS

1.

INTRODUCTION

2.

HOW

TO

INTERCONNECT THE UNITS

3.

ADDRESS SELECTION

4. ADDRESSING A MESSAGE

5.

COMMANDS

6.

READING

DATA

FROM

SYSTEM

21

7. PROGRAMMING WITH IMMEDIATE EXECUTION

8.

PROGRAMMING WITH USE OF PRE-PROGRAMMING AND DIFFERENT

EXECUTION MODES

8.1.

PRE-PROGRAMMING

8.2

. LOADING THE BLOCK-MEMORY

8.3.

CLEARING THE BLOCK-MEMORY

8.4

. INITIATE COMMANDS

8.5. HOW

TO

EXECUTE THE PROGRAMMED

OR

INITIATED FUNCTIONAL

COMMANDS

8.

6.

HOW

TO

PROGRAMME A TRIGGER

8.

7.

PM-NUMBER ADDRESSED EXECUTION

8.

BLOCK-OPERATION

8.9

. SCAN FUNCTION

9. HOW

TO

SEE

IF

UNITS ARE READY WITH THE PROGRAMMED

TASKS

10

. HOW

TO

SEE

IF

UNITS

HAVE

DATA

AVAILABLE

11.

PROGRAMMING

FOR

THE EXPERTS

12.

ANNEX

2.

HOW

TO

INTERCONNECT THE UNITS

by clipping the units

on

top of

each other

Press here, while moving down

the upper unit with the feet

in

the

holes of the lower one.

Then

release the button, by wich

the feet hook into the

holes.

with cable-set PM2192

by using Rack-mount PM2193

ST4698

How

to

clip the units together

If more distance between the units is required

(.5

m

up

to

maximum

150

m)

, only

the data-lines (data high twisted with data low) and the

OV-

lines may be used, not

the synchronization

lines.

3

3.

ADDRESS SELECTION

4

IEEE/IEC-bus address of the Master Unit

(selectable addresses

are

10

...

19)

ST4699

Warning: When an

even addresses is set, a

Service Request

will occur

after a power-on reset

(not

maskable).

Example

of a

PM2101

with IEEEIIEC-device address

11

(default address)

Unit address of

Functional Units

(consists of 2 fixed, type number dependent, and a third

variable digit)

20

ST4700

Example of a PM2120 with unit address

203.

4. ADDRESSING A MESSAGE

Any message to System

21

is of course preceded by the IEEE/IEC address set on

the master unit.

Example:

IEC PRINT #11,"message"

or

OUTPUT

711;

"message"

using P2000C

using HP85

sends the "message"

to

System

21

with IEEE/IEC address

11.

The routing of this message (to the master or to one of the slave units) is indicated

by the first

element of the message, the "unit address".

This unit address is:

"AID"

for the master (Additional Instrumentation Devices).

"AID" +3digits for the slave units.

These 3 digits consist of the

last two digits of the type number of the unit + 1 digit

set on the unit address switch.

Separation between unit address and the following commands is

";" or

",

".

If more

than one command is sent in one string, the

individual commands have to be

separated by commas.

Examples:

Message

Description

"AID;command"

routes a "

command"

to the master routes

the

two

''AID203;command,command'' commands to the unit

PM2120 with address switch

set to 3

5

5.

COMMANDS

Commands are given

in

ASCII-coded form. There are two types of commands:

1.

Commands for the total System

21

that have

to

be routed to the master unit.

2.

Commands for individual units that must be routed

to

the specific unit.

A

full survey of these command codes can be found

in

the annex (for master

commands and

slave commands valid for all slaves) and in the operating cards of

the

individual units (for specific unit dependent commands).

Examples:

Message Description

"AID;RESET" is a message to the master (AID) with the command

(RESET) to reset the system to the power-on conditions.

"AI 0201 ;CLOSE2,0PEN4"

is

a message to the slave PM2120 with address setting 1

(AID201) with the commands

to

close switch 2 and

to

open switch 4.

6.

READING

DATA

FROM

SYSTEM

21

To

input data from System

21,

first a command message requesting for this data has

to be sent and after that the system has

to

be addressed

as

talker to read the data.

Example:

6

on P2000C on HP85

100

IEC

PRINT

#11,"AID311;1NP

H"

100

OUTPUT

711;"AID311;1NP

H"

110

IEC INPUT #11,R$

110

ENTER

711;R$

The first message is a request to the

PM2131

with address switch set to 1

to

send

the data, which is

on

the input lines. With the second statement the data are read

from the system.

Note: An input statement always returns the result

of

the last request for data.

Earlier sent requests are automatically cancelled.

7.

PROGRAMMING WITH IMMEDIATE EXECUTION

In

the default position after power-on, System

21

executes incoming commands

immediately in the order

in

which they are programmed. This

is

the most simple

and straightforward way of programming, involving a limited number of commands,

of which the most important are given

below.

Function Message Description

System Reset "AID; RES"

Resets the total System

21

to the

power-on conditions.

Unit Reset

"AIDnnn;

RO

"

Resets slave with unit address "nnn"

to the power-on conditions.

Operating Mode

"AIDnnn;Mm"

Sets slave

with address

"nnn"

in

operating mode

"Mm"

(see operating

cards

of

the units).

Functional Command

"AIDnnn;cmd,

..

,cmd"

Sends

the commands

"cmd"

to the

unit with address

"nnn

".

Remarks:

1. The codes for the functional commands are unit dependent and can be found

on the operating cards of the units.

2. After a command requesting for the return of data,

System

21

must be

addressed as

talker to input the data into the controller.

3. A power-on system reset can

also be realised

by

pushing the RESET button

on

the master unit (not allowed during a running program).

7

8.

PROGRAMMING WITH USE

OF

PRE-PROGRAMMING AND

DIFFERENT EXECUTION MODES

8.1. PRE-PROGRAMMING

Each slave unit has a block-memory

in

which functional commands (that have

to

be

used repetitively) can

be

pre-loaded. This block-memory has 20 memory positions,

each of which can contain up

to

a full slave setting. The commands stored, can be

recalled from the memory positions serially or randomly by using INITIATE

commands (see

8.4.).

8.2. LOADING THE BLOCK-MEMORY

The block-memory is loaded

by

sending the commands to

be

stored, preceded by

"Pn"

indicating the memory position

at

which the data have

to

be

stored.

Examples:

"AID201;P3,CLOSE

O,OPEN

5" functional commands "CLOSE

O,OPEN

5"

are stored

in

block-memory position

3

(P3).

"AID201;PO,CLOSE 0-9;P1,0PEN

10-19

" "CLOSE 0-9" is stored

in

block-memory

position

0

(PO),

"OPEN

10-19

"

in

block-memory position 1

(P1).

8.3. CLEARING THE BLOCK-MEMORY

The block-memory

is

automatically cleared

at

reset or at a mode change of the unit.

It also can be cleared

by

sending "AIDnnn;R2". Individual positions of the block-

memory can be cleared

by

sending 'empty' commands

("Pn"

not followed by

commands).

Examples:

8

"AID218;P10"

"AID218;P10-15"

"AID218;R2"

clears block-memory position

10.

clears block-memory positions

10

up

to

incl.

15.

clears the total block-memory with

general slave command "R2".

8-4. INITIATE COMMANDS

With initiate commands, it is possible to recall the functional commands from the

block-memory. There are two possibilities:

Random recall: One can recall (initiate) any block-memory position. This is done

by

"I

n"

where n (

=0

..

.

19)

is the memory position to be initiated.

Serial recall: This is used with

"Block

Operation". For a description with

example see

8.8.

Example of a random recall at unit address

213:

"AID213;1

2"

Block-memory position 2 is initiated.

The initiating of commands from the

block-memory is comparable with direct

programming.

It does not automatically conclude that these commands are also

executed. Execution only follows when execution conditions are met (see next part).

8.5- HOW

TO

EXECUTE THE PROGRAMMED OR INITIATED

FUNCTIONAL COMMANDS

In

the default position of the system, the execution of commands sent to the slaves

is immediately after receipt of the individual commands. This is the "Execute

Unconditional"

mode.

To

enable synchronisation of actions within a slave

or

between different slaves, two further execution modes are available:

- "Execute on

X"

where programmed or initiated commands are simultaneously

executed on the first following character

"X"

received by the slave.

"Execute

on Trigger" where programmed

or

initiated commands are executed on

on

the System

21

internal trigger line (see

8.6).

These execution modes of the individual slaves can be programmed by

the

following commands (example with unit address

312)

:

Command Description

"

AID312

;

E~U

"

Execute Unconditional mode

"

AID312;E~X

"

Execute on command "X" mode

"

AID312

;

E~T

"

Execute on Trigger mode (see

8.6)

9

8.6. HOW

TO

PROGRAMME A TRIGGER

(impulse

on the trigger-line of the System

21

bus)

This can be done with

System

21

master command

"

AID;XCU~T

"

or

IEEE-bus command GET (Group Execute Trigger)

Examples:

Using on P2000C

on HP85

master command

IEC

PRINT

#11

,

"AID

;

XCU~T

"

OUTPUT

711

;

"

AID

;

XCU~T

"

IEEE command GET

IEC

TRIGGER #

11

TRIGGER

711

8.7. PM-NUMBER ADDRESSED EXECUTION

When only a group of identical units have to receive an execute command this can

be done by the command

"AID;XCU nn" addressed to the master (see also 8.9.

"Scan Function").

"nn"

stands for the last two digits of the slaves type number. This

execution command

is

independent of execution mode setting.

Example:

"AID;

XCU

20"

All PM

2120

units will execute their received commands (also initiate

commands), independent

on

the execution modes selected.

8.8. BLOCK OPERATION

10

Block operation is the sequential execution of functional commands stored on

successive positions

at

the block-memory, always starting with position 0 (serial

recall

from memory; see also

8.4).

Block operation is initiated

by

command "AIDnnn;

I~B

[,n)". The section enclosed within ( ] is optional.

"n"

represents

an

integer

value 0 ..........

19

indicating the last block-memory position to be executed. Omitting

the

value "n", the default value will be

19.

After that, execution can be performed

step by step by giving

"X"

or a trigger command, depending

on

the execution mode

selected,

or

a PM-number addressed execution command (see

8.7.).

The Execute

Unconditional mode is not allowed for block operation. "Block operation, once

initiated, may

only be followed by execution commands or request commands

(commands with

"?")

. All other commands will cancel block operation.

Example with unit address 200:

"

AID200;E._)(

,

I~B

,

5,X

"

"AID200;X"

8.9. SCAN FUNCTION

Execute on

"X"

mode, initiate block operation and execute

the first,

block-memory position.

Execution of second position

etc.

up

to

and including block

position

5.

(Available only

in

some slave units)

The scan function is used for the

sequential select of inputs, switches, channels. A

scan-cycle can be executed over channels of several units

on

the condition that:

All units are of the same PM-number.

All units are set for the same operating mode (see the System

21

manual and

the operating cards of the

slave units).

No unit is

in

Execute Unconditional mode (see

8.5)

.

The units have

successive-addres.~s

-

with settings starting at

0.

The scan is initiated by the command "AID nnn;l s

;;

,'

~h~te

'

rtnn

r

,

ep~e.sents

the

slave address. The execution is done with a number of execute commands or

triggers

equal

to

the number of channels

to

be scanned. Under the above

conditions a scan cycle will start with the lowest channel number of the unit with

address-switch set

to

zero and continue along all channels and units. A scan, once

initiated, may not

be

followed by other than execution commands. All other

commands

will cancel the scan.

Example:

"

AID200;E._)(

,

I~S

"

"AID201;E._)(,I~S"

"

AID202

;

E._)(,I~S

"

Repetitively:

"AID

;X

CU

20"

Initiate

a scan on PM2120 units with

addresses

200,

201

and 202.

Execute

to

all PM2120 units. The scan starts with

lowest channel of unit 200, and steps along all

channels

with the successive execute commands.

11

9.

HOW

TO

SEE IF UNITS ARE READY WITH THE PROGRAMMED TASKS

Default, the slaves pull the ready-line low as long as the programmed actions are

not finished. However each slave can be disabled to

pull the ready-line

low.

Command

Description

"AID213;R~E"

ready-line control enable (default): unit

213

will pull

the ready-line low when not ready.

"AID213;R~D"

ready-line control disable: unit

213

will never pull

the ready-line low (keeps ready passive true).

The state of the ready-line can be read by the master command

"AID;

ROY

?".

Addressing System

21

as

talker will give

as

response:

"AID;RDY

0"

"AID;RDY

1"

ready-line is low: the unit(s) are not ready.

ready-line is high: the unit(s) are ready.

If more than one slave controls the

rea.4-~

trnor

user

can appry a status request to

the different

slaves..wtttr'1tf!Jnnn;S ?" to see which ones are ready and which ones

are not

ready·fsee System

21

manual).

10. HOW

TO

SEE IF UNITS

HAVE

DATA

AVAILABLE

The most appropriate

way

to check for data availability at a unit is by the following

command:

Command

Description

"AIDnnn;S

?"

ask for the status of unit with address "nnn".

12

The response is "AIDnnn;S

"+

< 9 digits

>,

where digit number 5 represents data

availability (see

System

21

manual).

11.

PROGRAMMING

FOR

THE EXPERTS

System

21

offers

an

extensive range of further facilities such as:

Service Request for several reasons, which can

be

masked separately

Identification of

System

21

master and slave units

Configuration request

to

see which unit addresses are present

Status information of the master

as

well the slaves such

as:

• power fail

• address not present

• unit busy

• end of block or scan

• warning flags of slave units

• selected modes

• data available

Test

routines

A description of the use of above facilities is beyond the scope of this quick

operating guide.

To

explore all these possibilities of System

21

, a more detailed

study of the

System

21

manual is required.

13

12. ANNEX

0

•

0

•

14

A summary of commands with descriptions is given below. The headings indicate

the functions

to

which the commands are related. The left column gives the

command

level

to

which each command is applicable.

In

the following statements

given for

P2000C and HP85, the commands shall be filled

in in

the place of

"cmd"

except for the Group Execute Trigger and the Serial Poll commands where the

complete statements are given, because of the different command structure.

Defaults are given where applicable. The last column gives the section number

where the function is mentioned or

handled

in

this Quick Operating ·Guide. Where

"Sys.M"

is mentioned,

it

is referred to the System

21

manual; where "Op.Crd" is

mentioned, it is referred

to

the Operating Card of the slave. Where

"~"

is given

in

the command syntax, a space-character is necessary for command recognition.

Where a space

is

given (for readability), it is optional.

Default

addresses

IEEE/IEC address of

PM2101

11

Address switch

in

position

1.

Unit address of slaves

Command level

IEEE/IEC-interface

Master

Slave

Function I Command

Reset

"RES"

"

RO"

"R1"

"R2"

nnO

Address switch

in

position

0.

nn

are the last 2 digits of PM-number.

Statement

on

P2000C Statement on HP85

IEC

PRINT #11,"cmd" OUTPUT 711;"cmd"

IEC PRINT #11,"AID;cmd" OUTPUT 711;"AID;cmd"

IEC PRINt

# 11,"AIDnnn;cmd" OUTPUT

711;

"AIDnnn;cmd"

Description Default See

Sys.M

RESet the complete System 7

to

the power-on conditions.

Reset unit

as

after power-on 7

Reset unit

as

after mode change .

Clear the block memory

8.3

of the unit.

Function I Command Description Default

See

Operating mode

•

"Mn"

Select operating mode n .

7

Functional command (slave command)

•

"CLOSE

1"

Example of a functional 7

command. These commands are

unit specific and are

only handled

in

the operating cards of the

different

slave units.

Pre-programming

8.1

•

"Pn, cmd, ... , cmd" Functional commands

8.2

"cmd, .... ,

cmd"

are stored

on

memory position n

(n=0

...

19).

Block-memory clear memory

8.3

cleared

•

"Pn"

Clears memory position n .

•

"Pn-m"

Clears

memory position n up

to

8.3

including m, where

O<=n<m<=19

.

•

"R2"

Clears all memory positions.

8.3

Initiating

8.1

•

"In"

Initiate block-memory position n

8.4

•

"I

~B

[,n]"

Initiate block

operation, up

to

and

8.4/

including memory position

n.

8.8

•

"I~S"

Initiate a scan (see "scan

8.9

function).

Set trigger mode

Sys.M

0

"

TRG~R

"

TRiGger if Ready mode: enable

Sys.M

the trigger-commands GET and

"XCU T" only when the ready-

line

is

true or delay the received

trigger command

until the ready-

line becomes true.

0

"TRG~U"

TRiGger Unconditional mode: "TRG

R"

Sys.M

the trigger-commands GET

and

"

XCU

T" will unconditionally gene-

rate

an

impulse

on

the trigger-line.

15

Function I Command

Description

Default

See

Set

execution mode

8.5

•

"E~U"

Execute Unconditional mode.

"E

U"

8.5

This mode is not allowed for

block and scan operations.

•

"

E._)("

Execute on command

"X"

mode.

8.5

.

•

"E~T"

Execute on trigger mode (low

8.5

impulse on the trigger-line).

Trigger and execute commands

8.5

•

"X"

eXecute (if in " E

X"

mode).

8.5

0

IEC TRIGGER #

11

J

Statements for P2000C and HP85

8.6

0

TRIGGER

711

to generate a

GET

(Group Exe-

8.6

cute Trigger). Generates a

pulse

on the System

21

trigger-line if

enabled (see

"Set

trigger mode"

).

0

"

XCU~T

"

eXeCUte the units by a pulse on

8

.6

the System

21

trigger-line if

enabled (see "Set trigger mode").

0

"XCU

nn"

eXeCUte all units with "PM21nn"

8.7

numbers independent on the

execution mode of the units. This

command is

useful when using

"I

~S

"

commands to perform a

scan by more than one unit of the

same type number.

Block operation

8.8

•

"

1~8

[,n]"

Initiate block operation,

up

to

8.8

and including memory position n.

This command is to be

followed

by a repetitive execute command.

Each execute command executes

the present

block-memory

position and initiates a next o

ne

.

The Execute

Unconditional mode

"

E~U

"

is not allowed here.

16

Function I Command

Description

Default See

Scanning

8.9

•

"

I~S

"

Initiates a scan. This command is

8.9

to

be

followed by a repetitive

execute command.

On

each

exe-

cute command the next channel,

switch or

I/O-line is selected. The

Execute

Unconditional mode

"

E~U

"

is not allowed here.

Request f

un

ctional data Sys.M

•

"?"

Request for functional data. The 61

kind of data is determined

by

the Op.Crd

previous command.

In

many

cases the

"?

" is optiona

l.

Setting separators

PM2101

D

"SPA

n[,m]"

n and m (optional) are the "SPR

10

"

PM2101

decimal values of the !SO-codes

=

LF

to

be the record separator. n and

m

< 32 and #

27

(ESC).

D

"BSP n"

n is the decimal value of the

ISO

- "BSP

10

"

PM2101

code

to

be

the block separator.

=

LF

n <

32

and #

27

(ESC).

Request Identity data

Sys.M

D

"

ID

?"

Identity of PM2101+HW and

SW

"

PM2101

. S

..

"

PM2101

rei.

•

"

I?

"

Identity

of

slave

+HW

and

SW

rei.

"

PM21

... S .. "

Op.Crd

Request Configuration

Sys.M

D

"AID

?"

Which unit addresses

are

present?

Sys.M

Request Status

D

IEC

POLL #

11

,S

]

See "Serial Poll".

PM2101

D

S=SPOLL

(711)

PM2101

0

"

STA

?"

Status

data of System

21

?

Sys.M

•

"S ?"

Status

data of slave ? Op.Crd

Test

D

"

TSI~U

"

Test

IEEE/IEC-interface.

PM2101

D

"

TSI

" +CHR$(1-

70)

Test

IEEE/IEC-interface.

PM2101

•

"T n"

Perform test

n.

17

Function I Command

Description

Default

See

Service Request masking

D

"MSR

n"

Mask Service Request with

"MSR

0"

PM2101

decimal value

n=

0 ....

511

Mask-values:

values may be added to enable

more conditions to generate

SRQ.

decimal

enable

Service Request when:

value

256

PM2101

is no longer BUSY

128

A System

21

event occurred

16

PM2101

received

an

illegal code

0

"MSK"+

Mask System

21

events

"MSK

0"

Sys.M

(maximum 9 digits). A zero digit

disables the corresponding event

to generate a

Service Request.

digits:

"1"

A slave had a power fail,

"0

"

received a power-on reset or

received

an

illegal code or illegal

sequence.

"

2"

An addressed module is not

present.

"0"

"3"

All units became ready

performing the programmed

"0"

actions.

''4''

All units are ready with the

"0"

received data and may receive

new data.

"5"

A unit has data available.

"0"

"6"

All units are ready with the

"

0"

block or scan.

"7" A unit has a warning.

"0"

"8" The ready-line became high

(ready true)

"0"

"9"

A trigger-pulse was captured

on

"0"

the trigger-line.

18

Function I Command Description Default See

Serial

Poll

PM2101

D

IEC

POLL

#11

,S Statement to perform Serial Poll

PM2101

on

P2000C; status byte returned

inS

.

D

S=SPOLL

(711)

Statement

to

perform Serial Poll

PM2101

on

HP85; status byte returned

inS.

Ready-line

control/read

~

9

•

"

R~D

"

Ready-line control disable.

9

•

"

R~E

"

Ready-line control enable.

"R E"

9

0

"

ROY?

"

Logic state

of

the ready-line ? "

ROY

1"

9

Sequential

execution

Sys

.M

0

"

SEQ~ON

"

Sequential execution. "SEQ

ON

"

Sys.M

0

"

SEQ~OFF

"

Parallel execution possible.

Sys.M

Request

settings

I

modes

Sys

.M

•

"M ?"

Actual

operating mode

of

slave ?

0

"

TAG?

"

Trigger mode of master ? "

TRG

R"

•

"E

?"

Execution mode of slave ?

"E U"

•

"R ?"

Ready-line control mode ? "R E"

0

"MSK ?"

System

21

event mask ? "MSK 000000000"

0

"

SEQ?

"

SEQuential

execution mode ?

"

SEQ

ON

"

0

"DMP ?"

Dump data

of

master ?

"MSK 000000000,

TAG R,SEQ

ON

"

•

"D ?"

Dump data of slave ?

"M

.,

E U, R E"+

< functional

settings>

Additional

requests;

warning:

slow

responses

0

"BBS

?"

Which unit addresses are Busy

Sys.M

with a Block or a Scan ?

0

"

DAV

?"

Which unit addresses have

DAta

10

Available?

19

D

0

•

DATA-

AND STATUS-REQUEST COMMANDS WITH RESPONSES

A summary of all request commands for output- and status-data with the

corresponding responses is given

below. The left column gives the command level

to

which each command is applicable.

In

the followi

ng

statements given

fo

r P2000C

and HP85, the commands shall be filled

in in

the place of "cmd". The request

command

shall

be

followed by

an

INPUT/ENTER command

to

read the requested

data.

All responses, mentioned

in

the summary, from the master are preceded by

"AID;", those from the slaves are preceded by "AID nnn;".

Command level

Statement on P2000C

Statement on HP85

IEEEIIEC-interface

IEC

PRINT #

11

,''

cmd"

OUTPUT

711

,''

cmd"

Master

IEC

PRINT #

11

,''

AID;cmd"

OUTPUT

711

,''

AID;cmd"

Slave

IEC PRINT

#

11

,''AIDnnn;cmd" OUTPUT

711

,''

A1Dnnn

;cmd"

I "nnn" represents the unit address of the addressed slave

Requested data Command data Description

Response data

•

Functional data

"?"

Request for functional data.

Response:

< slave data> These data are specified

in

the

operating cards of the units.

0 Data available

"

DAV

?"

Request for the unit addresses

which have DAta

Available.

Response: "

DAV

" + < addresses> List of addresses of all units which

Example: "DAV

310

,

311

,

312

,''

have data available.

Warning: The master will poll all

PM-numbers,

which may take a

few seconds maximum.

0

Ready-line

"ROY?"

Logic state of the ready-line ?

Response:

"

ROY

0"

if ready-line is low (ready false)

"ROY 1"

if ready-line is high (ready true).

0

Busy Block or Scan

"BBS ?"

Which units are Busy with

a

Block or a Scan ?

Response:

"BBS" + < addresses>

List of

all units which are Busy

Example:

"BBS

210

,

211

,

212

,'' with a Block or a Scan.

20

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Philips Aleron Series 2-1 Quick Operating Manual

Philips Aleron Series 2-1 Quick Operating Manual

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