Fluke ScopeMeter 225C Manuel utilisateur

REMOTE CONTROL AND PROGRAMMING REFERENCE

for the FLUKE 190 family

of ScopeMeter test tools

=============================================================

This file contains remote control and programming information

for the above-mentioned models with use of the PM9080

Optically Isolated RS232 Adapter/Cable.

It consists of the following chapters:

1. INSTALLING THE PM9080

2. INTRODUCTION TO PROGRAMMING

3. COMMAND REFERENCE

APPENDIXES

APPENDIX A ACKNOWLEDGE DATA

APPENDIX B STATUS DATA

APPENDIX C WAVEFORM DATA

APPENDIX D ASCII CODES

Page 1.1

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1. INSTALLING THE PM9080

- Connect the PM9080 to the RS232 port of the computer.

If necessary, use a 9-pin to 25-pin adapter and

25-pin gender changer.

- Hook the PM9080 cable to the ScopeMeter.

- Turn on the computer and the ScopeMeter.

- Make sure that the communication settings match for the

RS232 port of the computer and the ScopeMeter.

After power-on, the default settings of the ScopeMeter

are as follows:

1200 baud, No parity, 8 data bits, 1 stop bit

You can modify the baud rate with the PC (Program

Communication) command. See chapter 3 COMMAND REFERENCE.

Other settings are fixed.

You can modify the computer RS232 port settings to match

the above ScopeMeter settings with the following

DOS command:

MODE COM1:1200,N,8,1

This command assumes that COM1 is the RS232 port used on

the computer. Replace COM1 in the above command with COM2,

COM3, or COM4 if one of these ports is used. You can place

this command in the computer startup file AUTOEXEC.BAT so

that the default settings for the computer are the same as

for the ScopeMeter. If you want to use a higher

data transfer speed (baud rate), let your QBASIC program

change the settings for both the computer and the

ScopeMeter. See the example under the PC (Program

Communication) command in chapter 3 COMMAND REFERENCE.

Page 2.1

=============================================================

2. INTRODUCTION TO PROGRAMMING

** Basic Programming Information **

When you have installed the PM9080 as described in the

previous chapter, you can control the ScopeMeter

from the computer with simple communication facilities, such

as GWBASIC, QuickBASIC and QBASIC (programming languages from

Microsoft Corporation).

All examples given in this manual are in the QBASIC language

but will also run in QuickBASIC. QuickBASIC allows you to

make executable files from programs so you can start such

programs directly from DOS.

It is assumed that you have knowledge of these programming

languages. QBASIC is supplied with Microsoft MS-DOS 5.0 and

higher and Windows 95, 98, and NT, including ’on-line’ Help.

Features of the syntax and protocol for the ScopeMeter

are as follows:

- Easy input format with a ’forgiving’ syntax:

All commands consist of two characters that can be

UPPER or lower case.

Parameters that sometimes follow the command may be

separated from it by one or more separation characters.

- Strict and consistent output format:

Alpha character responses are always in UPPERCASE.

Parameters are always separated by a comma

("," = ASCII 44, see Appendix D).

Responses always end with the carriage return code

(ASCII 13). Because the carriage return code is a

non-visible character (not visible on the screen or on

paper), this character is represented as <cr> in the

command syntax.

- Synchronization between input and output:

After receipt of every command, the ScopeMeter

returns an acknowledge character (digit) followed by the

carriage return code (ASCII 13). This indicates that the

command has been successfully received and executed.

The computer program must always read this acknowledge

response before sending the next command to the

ScopeMeter.

Page 2.2

** Commands sent to the ScopeMeter **

All commands for the ScopeMeter consist of a header

made up of two alpha characters sometimes followed by

parameters. Example:

RI This is the Reset Instrument command. It

resets the ScopeMeter.

Some of the commands are followed by one or more parameters

to give the ScopeMeter more information.

Example:

SS 8 This is the Save Setup command. It saves the

present acquisition settings in memory. The SS

header is followed by a separator (space),

then followed by the parameter "8" to

indicate where to store the settings. The

meaning of this parameter is described in

Chapter 3 COMMAND REFERENCE.

Some commands require several parameters.

Example:

WT 9,50,30 This is the Write Time command.

This command requires three parameters. The

parameters are separated by a comma, which is

called the Program Data Separator. You may

use only one comma between the parameters.

Also refer to the section ’Data Separators’.

A code at the end of each command tells the ScopeMeter

that the command is ended. This is the carriage return

code (ASCII 13) and is called the Program Message Terminator.

This code is needed to indicate to the ScopeMeter

that the command is completed so it can start executing the

command. Also refer to the section ’Command and Response

Terminators’.

Page 2.3

** Responses received from the ScopeMeter **

After each command sent to the ScopeMeter there

is an automatic response from it, indicated as <acknowledge>

(which you MUST input), to let the computer know whether or

not the received command has been successfully executed.

Refer to the ’Acknowledge’ section below.

There are several commands that ask the ScopeMeter

for response data. Such commands are called Queries.

Example:

ID This is the IDentification query, which asks for

the model number and the software version of the

ScopeMeter.

When the ScopeMeter has received a query, it sends

the <acknowledge> reply as it does after any command, but

now it is followed by the queried response data.

The format of the response data depends upon which query is

sent. When a response consists of different response data

portions, these are separated with commas (ASCII code 44).

Also refer to the section ’Data Separators’.

All response data, <acknowledge> as well as following

(queried) response data are terminated with the carriage

return code (<cr> = ASCII 13). Also refer to the section

’Command and Response Terminators’.

Page 2.4

** Acknowledge **

After receiving of a command, the ScopeMeter

automatically returns the <acknowledge> response to let the

computer know whether or not the received command has been

successfully executed.

This response is a one-digit number followed by <cr> as

response terminator. If <acknowledge> is 0, it indicates

that the ScopeMeter has successfully executed the

command. If the command was a query, the <acknowledge><cr>

response is immediately followed by the queried response data

terminated with <cr>.

If <acknowledge> is 1 or higher, it indicates that the

ScopeMeter has not executed the command

successfully. In that case, if the command was a query, the

<acknowledge><cr> response is NOT followed by any further

response data.

There can be several reasons for a non-zero <acknowledge>

response. For more information see Appendix A.

In case of an error you can obtain more detailed status

information by using the ST (STATUS) query.

Note: YOU MUST ALWAYS INPUT <acknowledge>, EVEN WHEN

THE COMMAND WAS NOT A QUERY.

Page 2.5

** Data Separators **

Data Separators are used between parameters sent to the

ScopeMeter and between values and strings received

from the ScopeMeter. Comma (",") is used as program

data separator as well as response data separator:

- Program Data Separator

Name Character ASCII Value Comments

Decimal

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

comma , 44 Single comma allowed

- Response Data Separator

Name Character ASCII Value Comments

Decimal

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

comma , 44

Page 2.6

** Command and Response Terminators **

(Message Terminators)

- Command (Program Message) Terminators

A code is needed at the end of each command to tell the

ScopeMeter that the command is ended, and that it

can start executing the command. This code is called the

Program Message Terminator. The code needed for the

ScopeMeter is carriage return (ASCII code 13 decimal).

Notes:

1. The carriage return code is a non-visible ASCII

character. Therefore this code is represented as <cr>

in the Command Syntax and Response Syntax lines given

for each command.

2. The QBASIC programming language, which is used for

all program examples, automatically adds a carriage

return to the end of the command output. (In the QBASIC

language, this is the PRINT #.... statement.)

After <cr> is recognized by the ScopeMeter, the

entered command is executed. After EACH command the

ScopeMeter returns <acknowledge><cr> to the

computer to signal the end of the command processing (also

see the section ’Acknowledge’.)

- Response (Message) Terminators

The response from the ScopeMeter ends with a

carriage return (ASCII 13). This is indicated as <cr> in

the Response Syntax for each command.

Page 2.7

** Typical program sequence **

An example

A typical program sequence consists of the following user

actions:

1. Set the communication parameters for the RS232 port of

the computer to match the ScopeMeter settings.

2. Output a command or query to the ScopeMeter.

3. Input the acknowledge response from the ScopeMeter.

If the response value is zero, go to step 4.

If the response value is non-zero, the ScopeMeter did not

execute the previous command. Read the error message from

the following acknowledge subroutine, recover the error,

and repeat the command or query. (This is not shown in the

following program example.)

4. If a query was output to the ScopeMeter, input its

response.

5. The sequence of points 2, 3, and 4 may be repeated for

different commands or queries.

6. Close the communication channel.

Refer to the program example on the next page.

Page 2.8

’Example of a typical program sequence:

’***************** Begin example program ****************

OPEN "COM1:1200,N,8,1,CS,DS,RB2048" FOR RANDOM AS #1

’This QBASIC program line sets the parameters for the

’RS232 port (COM1 on the Computer) to match the

’ScopeMeter power-on default settings. It also opens a

’communication channel (assigned #1) for input or output

’through the COM1 port. Your ScopeMeter must be connected

’to this port. "RB2048" sets the size of the computer

’receive buffer to 2048 bytes to prevent buffer overflow

’during communication with the ScopeMeter.

PRINT #1, "ID"

’Outputs the IDENTITY command (query) to the ScopeMeter.

GOSUB Acknowledge

’This subroutine inputs the acknowledge response from

’the ScopeMeter and displays an error message if the

’acknowledge value is non-zero.

INPUT #1, Response$

’This inputs the response data from the IDENTITY query.

PRINT Response$

’Displays the queried data.

CLOSE #1

’This closes the communication channel.

END

’This ends the program.

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