Bronkhorst RS232 interface Manuale Utente Scaricare il pdf (Pagina 4)

BRONKHORST®

Page4RS232interface    9.17.027

1 GENERALPRODUCTINFORMATION

1.1 INTRODUCTION



This manual will explain how to communicate with a Bronkhorst



instrument to your PC/PLC using RS232 serial communication. You

have to write software yourself using the information of this

document in order to be able to operate these instruments.

Bronkhorst also offers software to easily operate digital instruments

with your PC using Microsoft Windows. On the highest supported

communication level,

you may use FlowDDE channels for Windows

application‐programs with this facility. You can use the program

FlowDDE for easy connection between Windows applications (e.g.

Excel, Visual Basic, LabVIEW, Delphi, Borland C)  and digital

instruments.ThereareseveralexamplesavailableforLabVIEW,Visual

BasicandExcelenvironments.



Onalower

communicationlevel,youcanalsousetheFLOWB32.DLLforreading/changingparametervalues.



ToreadandwriteparametervaluesfromortoFLOW‐BUSdevicesdirectlythroughtheavailableinterfacesthereisa

special protocol for messages between these devices. This protocol has been specially developed for Bronkhorst 

equipmentsono

thirdparty equipmentcanbeconnected.Itconsistsofahierarchicalsetupforinstruments/nodes

(max.126)containingprocesses(max.127)withparameters(FBnr)(max.32)whichvaluescanbesettocertainvalues

toenablesettings/propertiesfortheinstruments.



WhenoperatingaFLOW‐BUSsystemwithaHOST

computer,youneedtoknowthismessageprotocolifyouchooseto

drivetheinterfacesdirectly.WhenyouuseaRS232/FLOW‐BUSinterface(withoutthemicro‐switchand2LED’s),you

firsthavetoinitialisetheinterface.ThiscanbedonebymeansofsendingsomeASCII‐stringstotheinterface

through

RS232.Seechapter“InitialisingRS232/FLOW‐BUSinterface”formoredetails.

WhenyoucommunicatedirectlyviaRS232onaMultibusinstrumentorwhenyouuseanewtypeofRS232/FLOW‐BUS

(baudratesupto38K4withswitchand2LED’s)interface,nospecialinitialisationisneeded.



Bronkhorst: ThisincludesBronkhorstHigh‐TechB.V.,BronkhorstCori‐TechB.V.and

M+WInstrumentsGmbH.



1.2 MULTIBUSTYPES



In2000Bronkhorstdevelopedtheirfirstdigitalinstrumentsaccordingtothe“multibus”principle.Thebasicpc‐board

on the instrument contained all of the general functions needed for measurement and control, including alarm,

totalizing and diagnostic functions.Ithad analog I/O‐signals andalso an RS232 connection as a standard

feature. In

addition to this there is the possibility of integrating an interface board with DeviceNet™, Profibus‐DP

, Modbus ,

FLOW‐BUSorEtherCATprotocol.Thefirstgeneration(MBC‐I)wasbasedona16bit

Fujitsu controller. It was superseded in 2003 by the Multibus type 2 (MBC‐II). This

version was  also based on the 16 bit Fujitsu controller but it had several

improvements

 to the MBC‐I. One of them is the current steering of the valve. It

reduced heat production and improved control characteristics. The latest version

Multibuscontrollertype3(MBC3)isintroducedin2011.Itisbuildarounda72MHz

32 bit NXP ARM controller. It has AD and

DA controllers on board which makes it

possible to measure noise free and control valves without delays. The internal

controlloop runs 6 times fastercompared totheMBC‐II therefore control stability

has improved significantly. It also has several improved functions like reverse

voltageprotection,inrushcurrentlimitationandovervoltage

protection.



MBC3instrumentscanberecognisedbythe“MBC3”placedonlowerleftside

oftheinstrumentlabel(seeexample).

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Bronkhorst RS232 interface Manuale Utente Pagina 4

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