Bronkhorst RS232 interface Instrukcja Użytkownika Pobierz pdf (Strona 28)

BRONKHORST®

Page28RS232interface    9.17.027

5 PARAMETERINFORMATION

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FLOW‐BUS is used for parameter value exchange between instruments and operation modules (keyboard or PC‐

interface). Parameter information consists of several properties for behaviour within the FLOW‐BUS system. In the

‘parameterproperties’tableyouwillfindalistofparametersandtheirproperties.Inthe‘parametervalues’table,

the

valuesaredescribedmoredetailed.Thislistconsistsmostlyofparametersformodesettings.

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Propertydescriptioninparameterpropertiestable:

Item Description

Parameter(DDE) uniqueparameternumber(alsousedforDDE‐communication:P(x))

Name nameoftheparameter,usedforparameteridentification

process processwhereparameterisusedonFLOW‐BUSmoduleusedforcommunicationdirectlythrough

RS232whenfilledinthetable,thisvaluehastobeused(forparameterslocatedinonly1process)

whenemptyinthetable,processhastobedeterminedfromtheFLOW‐BUSsysteminformation

(for

parameterslocatedinmorethanoneprocess,e.g.setpoint,measure);

FBnr(parameter) parameternumberinprocessonFLOW‐BUSmoduleusedfor communicationdirectlythrough

RS232

VarType variabletypeforinformationaboutamountofbytes

 c (unsigned)chartype 1byte value0..255

 I (unsigned)integertype2bytes value0..65535

 f floattype 4bytes value+‐1.18E‐38..+‐3.39E+38(IEEE‐floatingpointnotation)

 l (unsigned)longtype 4bytes value0..4294967295

data

types>1byteareMSBfirst.

VarLength variablelengthtoindicatelengthofstringofcharsusedincombinationwithVarTypecfor

transportationofstringsthroughFLOW‐BUS:value0..65535

VarLengthindicatestheamountofbytesforaparametertype

 ‐2 indicatesthatastringiszero‐terminated,notdefinedforlength

 X

indicatesastringwithalengthofXbytes(characters)

 0 meansnoinforequired,i.e.zero‐terminated.

Min minimumvalueofparameterallowedwhenparameterisread/writtenviaRS232,thevaluewillbe

checkedonthislimit(errorwhenoutoflimit)

Max maximumvalu eofparameterallowedwhenparameterisread/writtenviaRS232,thevaluewillbe

checkedonthislimit(errorwhenoutoflimit)

Read indicationifparameterisallowedtobereadviaFLOW‐BUS

Write indicationifparameterisallowedtobewrittenviaFLOW‐BUS

Poll indicationifparametershouldbepolledcontinuouslybyRS232applicationinordertokeep

(changing)parameterinformationuptodate

Advanced indicationifparameterisforadvancedusersonlythesearemainlyparametersfor

maintenance/service

Secured indicationifparameterissecuredforusethroughFLOW‐BUSreadingthisparameterispossible,

butchangingitneedsspecialhandling

Highsecurity indicationifparameterishighlysecured(onlyfewparameters)readingthisparameterispossible,

butchangingitneedsspecialhandling

Description shortdescriptionaboutmeaningofparameterorwhatitisusedfor

DDEstr parameterDDEstring(max.10characters),DDEvaluewhenparameterisnotavailableon

instrument;also:untilFlowDDEV4.58usedforparameteridentification

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Parameteracceptance:

Changingparametervaluesispossiblewhenaparameterisnotread‐onlyandnotsecured.Therange

andtypeofparametersaredescribedinthetables.Whenparametervaluesareoutofrangetheywill

beeither'clipped'onthenearestvalueallowedoryouwillgetanerror

message:'parametervalue

error'.

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