Omega DPI740 Owner's manual

DPI 740

Precision Pressure Indicator

User Manual

M-2912

@ Omege Engineering, Inc.

This document is the property of Omega Engineering, Inc and maynot, either in part

orwhole, be copied or otherwise reproduced, communicated in any way to third

parties, nor stored in any Data Processing System, without the express written

authority of Omega Engineering, Inc

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Table 6-3

Example Program in QBASIC

Battery Safety

This instrument is fitted with three size AA batteries either

rechargeable (nickel cadmium) or non-rechargeable

(alkaline).

Before storing this instrument remove the batteries

When fitting batteries make sure the electrical contacts are

clean and observe the correct polarity.

The battery compartment should be inspected for

corrosion caused by leaking batteries. Corrosion must be

removed using approved methods*.

When storing and transporting batteries make sure that

they cannot be short circuited. A short circuited battery

can become very hot and can, in certain circumstances,

explode. It is recommended that a suitable container is

used for storing and transporting batteries.

Dispose of old batteries using a safe, approved method.*

*Refer to the Battery Manufacturer for this information.

Software Version

This manual contains operating instructions for instruments

with software version 1.XX. Further changes to the

instrument's software may require a change to the operating

instructions and an issue number change of the manual.

start:

EOFch=26

CLS

port%=1

PRINT SPC(20); 'DPI 740 Omega Universal Communi(;ations

Interface: Example Program' PRINT SPC (19);

PRINT

PRINT Before commencing, ensure that the DPI 740

Communications Parameters are set as follows"'

PRINT

PRINT 'Baudrate : 9600, Parity" None, Handshaking" None,

Databits " 8, Stop bits " l'

PRINT

PRINT 'The PC serial comms port used is COM";

PRINT port%

PRINT

PRINT 'Please note DOS File Name" Pressure Readings will be

Logged in this File'

PRINT

INPUT Nm$

PRINT

PRINT'Ready'

PRINT" Press <CTRL><BREAK> to exit'

PRINT 'Starting communications'

OPEN Nm$ FOR OUTPUT AS #2

IF port% = 2 THEN

OPEN 'COM2"9600,N,8,1,RS,RB6000. FOR RANDOM AS #1

ELSE

OPEN 'COM2"9600,N,8, 1,RS,RB6000' FOR RANDOM AS #1

END IF

PRINT "Comm port opened OK'

a$="

PRINT#1, "#sa?" + CHR$(13);

PRINT #2, '#sa?' + CHR$(13) + CHR$(10);

GOSUB GetReply

address$=RIGHT$(a$,4)

address$= LEFT$(address$,2)

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Abbreviations continued

Table 6-1

Table of Error Definitions

The 16-bit hexadecimal mask defined below can be specified

using the AE command. It is used for automatic error

reporting by the RE message transmitted by the instrument.

PCB

ppm

psi

OFE

OFF

Bit Error

0 syntax error

parameter error

ONH

RPT

RTS

RS232

Rx

Tx

V

VA

oC

of

configuration

error

printed circuit board

parts per million

pound per square inch

barometric pressure at airfield level (local)

calculated sea level pressure including air

temperature

calculated sea level pressure

resonant pressure transducer

ready to send

Serial data communication standard

receive

transmit

Volt

Volt amp

degrees Celsius

degrees Fahrenheit

address error

checksum

error

Symbols

calibration

error

sequence error

The following symbols are used to identify hazards on

this instrument.

Description

Set if the command syntax was not understood

Set if the parameters in the command were out of

range or not valid

The configuration parameters can only be changed

if the configuration PI N is sent with the commands

If the PIN is not sent or is incorrect this error is

reported

An invalid address packet was received

The received command checksum did not match

with the calculated checksum With this error,

the command is not executed and this error

reported

An error occurred while trying to zero a measurand,

probably because the zero offset is too large

Error in the instrument's calibration procedure;

not enough calibration points

A valid command was received, but can not be

processed because the instrument was not in the

correct state to execute command

This command was not available on this

instrumenc

Reading outside range

Static sensitive components handle with

extreme care.

8 command not

available

9 range error

10 reserved

11 reserved

12 reserved

13 reserved

14 reserved

15 reserved

&

This symbol, on the instrument, indicates

that the user should refer to the user

manual.

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Protocol format commands

Command: FC -Enable/disable message

checksum

Format: FC=<fiag>

Description: Format checksum command. Enables/

disables the checksum feature of the data

transactions.

<flag> = O disable checksum feature

1 enable checksum feature

Examp/e: FC = O disab/e checksum feature

FC = 1 enable checksum feature

Query. There is no corresponding query command.

Command: FA -Enable/disable addressed

mode

Format FA=<fiag>

Description. Format addressing mode command.

Enables/disables the addressed mode

feature of the data transactions. When

addressed mode is disabled. one to one

communication (direct mode) is assumed.

<flag> = O disable addressed mode

1 enable addressed mode

Examp/e: FA = O disab/e addressed mode

FA = 1 enable addressed mode

Query: There is no corresponding query command.

Table of Contents (contd)

title

6 Communications ..." " , "' , "'.."

6.1 Introduction , "'..." ,.,..." " "..."".."

6,2 General Command Format .." , " "'.

6,3 Command Summary "' "..."' ,,...""..""

6.4 Command Set "...""..""..."' ' " "' '

Input Commands ""..."' "' , " " ,.

Process Commands , ", " " , , Set-up Commands ."...""..."' " " " '

Calibration ComrtJands .." " " " "..

Automatic Commands , " "'..." "..."..

Read Commands ..."'..."".."' "'..."'..." '

Protocol Format Commands ,..." ,,'..." ,

Key Commands .." "'..." "'..."' "..."

Table of Illustrations

page

1

6

8

9

11

12

13

14

16

19

22

25

30

34

fig. title

1-1 General view 2-1 Fitting the battery 2-2 Electrical connections 2-3 Adaptor/charger connector 3-1 Instrument front 'panel 3-2 Measurement mode menu 3-3 Local pressure measurement

3-4 Sea level measurement 3-5 Altitude measurement 3-6 Process sub-menu 3-7 MaxiMin menu 3-8 Set-up menu 3-9 Communications set-up 3-10 Calibration

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DPI 740 User Manual

Read Battery Volts

1 Introduction

The Omega DPI 740 precision pressure indicator uses a

silicon resonant pressure transducer producing a pressure

reading in units of pressure measurement and altitude.

The instrument is contained in a molded enclosure of a

composite ABS material and can be used as a hand-held

indicator or. using a retractable stand. as a bench instrument.

The instrument can also communicate. through a serial RS232

connector. with a compatible computer system or printer.

RB?

Read battery voltage

RB? query battery voltage

Reply:

RB= <voltage>

RB = 3.9 battery 3.9 volts

There is a query only command.

Query:

RI -

Read instrument type and

version number

Format'

Description:

Query'

RI?

Read device equipment. this returns the

instrument type on the network including

the version of the code, in the form:

RI = <string>

where: the string is in the format:

'DPlnnn,Vm.mm'

nn = instrument type

m.mm = version and issue number

RI? query instrument version and

issue number

RI = DP1740, V1.10

There is a query only command.

Figure 1-1 General view

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DPI 740 User Manual

Command:

Format:

Description:

CD- Calibration date

CD = <dd/mm/yy>

Sets calibration date, only valid in calibration

mode.

CD = 24/01/98

set cat date to 24 January 1998

CD? query date of last calibration.

Reply: CD = 24/01/97

Specification (contd)

Display

Read-out 999999 LCD digits, 0.535' (13.6 mm) high

with additional 16 text characters

Overload indication

Error code flashing

Response

Resolution

'xample:

at nominal11 0% FS

Query

nominal 2 readings/second

0.001 inHg (e.g., 1.034 inHg a)

Example of a two point calibration

IV = 18 set-up input as inHg

PP = 123 PIN entered put instrument

into calibration mode

CT = 1 perform two point calibration

Electrical Power Supply

Batteries

3 x 1.5 V alkaline size AA

Connections

external power adaptor/charger

.International power jack

6-way LEMO type

RS232 serial communications

Electrical safety

This instrument meets:

CP = 23.62 applied pressure 23.62 inHg

CP =32.48 applied pressure 32.48 inHg

CA calibration accepted

CD calibration date

""""""""""" BS EN 61010 as applicable

Electromagnetic compatibility

This instrument meets"

..EN50081-1 (emissions)

...EN50082-1 (immunity)

rJes necessitatesContinuing development some

specification changes.

Command:

Format:

Description:

PP -PIN protection

PP = <pin>

This command is used to change the PIN of

the instrument which is used to protect the

calibration data and configuration.

<pin> = 123 calibration PIN code

pp = 123

Example:

instrumen

PIN entered ;;

Query:

into calibration mode

There is no corresponding query command.

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DPI 740 User Manual

DPI 740 User Manual 5

Command:

Format:

Description:

Query"

CP -Enter Calibration Point

CP = <value>

The calibration point value is given by <value>

in the currently selected units.

A query of this parameter CP? returns the

number of calibration points already recorded

by this command. The instrument also

indicates that it is ready for the next

calibration point.

Reply:

example

CP = O no cal points

recorded

CP=2 2 cat points

recorded

After entering all the points required to calibrate the instrument,

the accept calibration command CA must be sent to update

the data in the instrument's nonvolatile memory.

2 Installation

WARNING:

DO NOT ATTEMPT TO CHARGE NON-RECHARGEABLE

BATTERIES. TO PREVENT ACCIDENTAL CHARGING OF NON-

RECHARGEABLE BATTERIES THE CHARGE LINK LK2 MUST BE

IN THE DISABLED POSITION (X).

CAUTION:

Do NOT LEAVE OISCHARGEO BATTERIES IN THE INSTRUMENT.

OLD BATTERIES CAN LEAK AND CAUSE CORROSION.

WHEN FITTING THE BATTERIES MAKE SURE THE ELECTRICAL

CONTACTS ARE CLEAN AND OBSERVE THE CORRECT POLARnY.

N!lJ#-: For further information. refer to the safety page

at the front of this manual and to the battery

manufacturer.

2.1 Battery (Figure 2-1)

Three batteries are fitted in the battery compartment.

For non rechargeable batteries make sure the charging link

LK2 is fitted in the disabled positibn (X).

For rechargeable batteries make sure the charging link LK2

is fitted in the enabled position (,1).

N!lJ#-: The charging link LK2 is located on the

instrument PCB. To access th,s link remove the

top case assembly.

To replace the batteries, unscrew the captive screw and slide

off the battery compartment cover. Make sure the polarity of

the new batteries is correct.

If the battery capacity is low the display shows:

" The battery symbol (approximately 1 hour left).

" The flashing message Battery Very Low for 15 to 20

minutes.

" The message Batteries Dead! followed, after a short

time, Switching Off!! the instrument then

automatically switches off

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7

R$232 connections

Option C is the adaptor cable recommended for use with the

RS232 serial communication interface. The adaptor cable

has, at one end, 6-pin LEMO type connector and, at the other,

a 9-way D type connector. The instrument's serial

communication settings and the data terminal equipment

(DTE) settings must be the same. The recommended initial

settings are as follows:

Baud rate 9600

Data bits 8

Stop bits 1

Parity none

Handshaking none

Adaptor Cable

I Flow I Function I Pin No. -1-Pin No.

TxD

RTS

GND

CTS

RxD

3

7

5

8

2

4

7

5

3

Pin No. Function

1 RxD input f-

2 CTS input f-

3 GND (screen) H

4 not used

5 RTS output -t

6 TxD output -t

Set-up commands

Command: SA- Set instrument address

Format" SA = <nn>

Description: Set instrument address to <nn>" Changes

the network address of the instrument in the

range O to 98. Address 99 is used for global

commands,

Example: SA= 10 sets instrument address to 10

Query' SA? query instrument address

Reply" SA=10

Command: SU- Set-up "regular" units

Format: SUn = <units index>

Description: Selects the pressure units that appear as

default selection F2 in measurement mode,

Both required parameters must be specified

i.e" the push-button sequence n (1, 2 or 3)

and the <units index>.

Example: SU1= 16 sets first units (1) to psi

SU2= 18 sets second units (2) to inHg

Query" The corresponding query command returns

the index to the pressure units selected for

the specified option,

SU1?

Reply: SUn=<units index>

SU1=16

~

,. The function column for the D type connector uses

RS232 terminology with respect to DTE.

2. In the D-type connector DTR and DSR should be

connected together as follows:

9-way pin 4 and 6

25-way pin 20 and 6

3. The instrument's sen81 communication settings can

be changed using the set-up menu.

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DPI 740 User Manual

~

Example:

pr=.-IIR\

Example:

PC=>(IR)

Example:

T tare

PC= T(IR)

Full tare of input reading.

PC= TOR,1 00.00)

Define tare of input reading, subtracts 100

from reading. The value specified in the

command is in the currently selected units.

This tares the value but does not change

the displayed value.

< minimum

Defines the minimum value of the input

reading. To reset this value use PM

command.

> maximum

Defines the maximum value of the input

reading. To reset this value use PM

command.

O OFF

PC=OOR,200,20)

Define the derived OFF input value changing

both the <height> and <temp> parameters.

A altitude {also see command PA)

PC=AOR,120.00)

Define the derived ALTITUDE input value

changing the current or default setting of

<datum pressure> to 120.00.

Figure 2-3 Adaptor/charger connector

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Omega DPI740 Owner's manual

Omega DPI740 Owner's manual

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