Bronkhorst RS232 interface Bedienungsanleitung PDF herunterladen (Seite 19)

BRONKHORST®

Page19RS232interface    9.17.027

3.9 INITIALISINGRS 232/FLOW‐BUSINTERFACE



If you use a RS232/FLOW‐BUS interface for communication (without the micro‐switch and 2 LED’s), note that this

moduleisnotpartofthe(FLOW‐BUS)token‐ringnetwork,directlyatpower‐up.Thismeansthatitisalwaysnecessary

to re‐initialise the module when power has been

interrupted! This is not the case whenusing an RS232/FLOW‐BUS

interfacewithmicro‐switch,redLED,greenLEDandRJ45connector forFLOW‐BUS. Bymeansoftheswitchyoumay

force the interface to find a free address on the FLOW‐BUS once. You may skip the initialisation and

 start directly

sendingmessages.



Alsowhenusingdigital(Multibus)instrumentswithRS232directlyontheinstrumentitisnotneededtoinitialise(give

a free node‐address to) the instrument on the FLOW‐BUS because instrument is not physically connected to the

FLOW‐BUS, but only uses the same protocol.

You may start directly sending your messages to the instrument on

either the node‐address of the instrument in its memory e.g. node 3 (selective response) or to node‐address 128

(alwaysresponse).



Atpower‐upsituationyoucancommunicatewiththeRS232interfaceonlyattheRS232sidevia

node0.Togetpartof

theFLOW‐BUS you have to sendan init command, send the network parameters PNA, SNA, NNA, LNA and BM and

sendaresetcommand.FromthismomenttheinterfaceispartoftheFLOW‐BUS.Ensurethemodulegetsafreeand

uniqueaddress

onthebus,2 modulesonthesameaddresswillcausecommunicationproblems.Whenyouaresure

that there are no more interfaces in the system, simply force the RS232/FLOW‐BUS interface to address 1. This

addressisreservedfor an interface. PC‐supportsoftware (FLOWB32.DLL)willsearchfora

freeaddressonwhich the

interfacewillbeinstalled.



FollowthestepsbelowtorealisecorrectinitialisationforthisinterfaceviaRS232:



InitialisationRS232interface(neededforFLOW‐BUS/RS232interfaceswithoutswitchandLED’sonly)

Send Response Comment

:050001000A49\r\n Initinstructionfornode0process0.

 :04000000XX\r\n Noerror.

:050001000101\r\n PNA=PrimaryNodeAddress=1

 :04000000XX\r\n Noerror.

:05000100027F\r\n SNA=SecondaryNodeAddress=127

 :04000000XX\r\n Noerror.

:050001000302\r\n NNA=NextNodeAddress=2

 :04000000XX\r\n Noerror.

:050001000420\r\n LNA=LastNodeAddress=32(dependsonsystemsize)

 :04000000XX\r\n Noerror.

:050001000502\r\n BM=BusManagement=67

67=everythingautomatically(autoarbitration+gapskipping)

3=autoarbitration

2=alwaysbusmaster

1=temporary

Inoldersystems:whennoR/C‐modulesinsystemmakeBM=2,

whenR/C‐modulesinsystem(alreadybusmasterspresent)

than

makeBM=1;otherwisemake=67

 :04000000XX\r\n Noerror.

:050001000A52\r\n Resetinstructionformodule;fromthismomentonmodulewillbe

activeonFLOW‐BUSatnodeaddress=PNA

 :04000000XX\r\n Noerror.



 Sometimesitcouldbenecessarytorepeatthefirstinstruction.Waitapprox.2secondsbefore

sendingthenextcommand.

 XXmeans:don’tcare

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