Comtrol DeviceMaster UP – Modbus Server User guide

Modbus

Server

UserGuide

TrademarkNotices

Comtrol,DeviceMaster,andPortVisionareregisteredtrademarksofComtrolCorporation.

EthernetisaregisteredtrademarkofDigitalEquipmentCorporation,Intel,andXeroxCorporation.

ModbusisaregisteredtrademarkofSchneiderElectric.

PLCisaregisteredtrademarkofAllen‐BradleyCompany,Inc.

Otherproductnamesmentionedhereinmaybetrademarksand/orregisteredtrademarksoftheirrespectiveowners.

SecondEdition,January7,2011

AllRightsReserved.

ComtrolCorporationmakesnorepresentationsorwarrantieswithregardtothecontentsofthisdocumentortothe

suitabilityoftheComtrolproductforanyparticularpurpose.Specificationssubjecttochangewithoutnotice.Some

softwareorfeaturesmaynotbeavailableatthetimeofpublication.Contactyourresellerforcurrentproduct

information.

Document Number: 2000535 Rev B

DeviceMasterModbusServerUserGuide:2000535Rev.B TableofContentsiii

Table of Contents

ModbusServerApplicationOverview........................................................................................................ 5

RecommendedChassis ................................................................................................................................................................ 5

TermsandDefinitions ................................................................................................................................................................. 6

WhatisModbus? ............................................................................................................................................................................ 7

Modbus/RTU(SupportedbyModbusServer) ...................................................................................................................................7

Modbus/TCP(NotsupportedbyModbusServer)............................................................................................................................7

ModbusServerFunctionality..................................................................................................................................................... 8

InstallationOverview ....................................................................................................................................11

InstallingPortVisionPlus .........................................................................................................................................................11

ConfiguringtheNetworkSettings ..........................................................................................................................................12

UploadingModbusServer.........................................................................................................................................................14

EmbeddedWebPages................................................................................................ ....................................15

ConfigurationOverview ............................................................................................................................................................15

ServerCon fig uration(Main)Page .........................................................................................................................................16

SerialInterfaceConfigurationPage.......................................................................................................................................17

EditPortConfigurationPage ..................................................................................................................................................................18

EditNetworkConfigurationPage...........................................................................................................................................21

EmbeddedDiagnosticandStatisticsPages.............................................................................................23

KnownModbus/RTUDeviceListWebPage .......................................................................................................................23

SerialInterfaceCommunicationsStatisticsPage ..............................................................................................................2 4

SerialInterfaceLogsPage.........................................................................................................................................................26

TroubleshootingandTechnicalSupport.................................................................................................27

TroubleshootingChecklist ......................................................................................................................................................27

GeneralTroubleshooting ..........................................................................................................................................................28

DaisyChainingDeviceMaster2E/4PortUnits..................................................................................................................29

TechnicalSupport........................................................................................................................................................................30

ivTableofContents DeviceMasterModbusServerUserGuide:2000535Rev.B

TableofContents

DeviceMasterModbusServerUserGuide:2000535Rev.B ModbusServerApplicationOverview5

ModbusServerApplicationOverview

ThissectiondefinesthesoftwarefunctionalityfortheModbusServerapplication.

TheModbusServerapplicationwasdesignedtoprovideenhancedconnectivityforOPC

serversandapplicationsthatrequireModbus/RTUcommunications.Whilestandard

gatewaysprovideconnectivityforonlyoneapplicationperserialport,ModbusServer

providesconnectivityforuptosixapplicationsperserialport.

ModbusServerwasdesignedtogreatlyenhancesystemmaintenancecapabilities.

Includedarecomprehensivedeviceandportspecificdiagnosticwebpagesthatdisplay

status,messageresponsetiming,timeout,andothererrorcounts,andoverallmessage

statistics.Aseriallogisalsoincludedtoprovidemessageleveldiagnosis.

RecommendedChassis

ThefollowingtableliststherecommendedDeviceMasterRTSorDeviceMasterUPchassis

basedonModbus/RTUmessagethroughput.

Note: TheseestimatesarebasedonaModbus/RTUrequestand/orresponsemessagesize

of20bytes.Actualthroughputwillvarydependingonmessagesizeandsystem

requirements.

Throughput 1Port 2Ports 4Ports 8Ports 16Ports 32Ports

VeryHigh‐Messagerateof

uptoonemessageevery50

msperport(20messages

perportpersecond)

High‐Messagerateofupto

onemessageevery100ms

perport(10messagesper

portpersecond)

XX X

Medium‐Messagerateofup

toonemessageevery200ms

perport(5messagesper

portpersecond)

XX X X

Low‐Messagerateofupto

onemessageevery500ms

perport(2messagesper

portpersecond)

XX X X X

VeryLow‐Messagerateof

uptoonemessageevery

secondperport(1message

perportpersecond)

XX X X X X

Latency

Transmit(Fromapplication

todevi ce)

2‐10ms(*) 5‐20ms(*)

0‐30ms(*)

Receive(Fromdeviceto

application

2‐10ms(*) 5‐20ms(*) 5‐50ms

10‐100ms

(*)=BasedononeEthernetTCP/IPconnectionperserialportr

unninginanormal

uncongestedsystem.Themaximumoveralllatencywillincreaseasthenumberof

EthernetTCP/IPconnectionsincrease.

6ModbusServerApplicationOverview DeviceMasterModbusServerUserGuide:2000535Rev.B

TermsandDefinitions

Term Definition

Master(orClient)Mode

ThemethodofoperationwhenaDeviceMasteroran

applicationisoperatingasa“Master”orthemessage

originator.

Slave(orServer)

ThemethodofoperationwhenaDeviceMasteroran

applicationisoperatingasa“Slave”orthemessage

receiver.

Modbus/RTU

ThestandardModbusmessages,inhexadecimal

format,thataretypicallytransmittedoverseriallines

butcanalsobetransmittedoverothercommunication

methodssuchaswirelessorEthernetTCP/IPsocket

connections.

Note: Modbus/RTUoverEthernetTCP/IPisnotthe

sameasModbus/TCP.

Polling

Theprocesswhereanapplicationrequestsdataona

continualbasis.InthisoperationtheMastersendsthe

requestmessageswhiletheSlaverespondstothe

messages.

Sockets

Themethodusedtocommunicatebetweendevices

whilecommunicatingoverEthernetTCP/IP.

DeviceMasterModbusServerUserGuide:2000535Rev.B ModbusServerApplicationOverview7

WhatisModbus?

Modbus/RTU

(SupportedbyModbus

Server)

Modbus/RTUisnativeModbusinhexadecimalformat.ThesearethebaseModbus

messagesthatcontainsimplereadandwriterequests.Theformatisasfollows:

Where:

• ThetermsMasterorClientareusedtoidentifythesenderofthemessage.

• ThetermsSlaveorServerareusedtoidentifythedevicesrespondingtothemessage.

Modbus/RTUisusedfor:

• Serialportconnectivity.RS‐485isthemostcommon,butRS‐232andRS‐422arealso

used.

• EthernetTCP/IPsocketconnections.ThisisnotthesameasModbus/TCP(pleasesee

nextsection),butdoesprovideaverysimplemethodofinterfacingtoremotedevices.

ItisusedbymanyapplicationsandsomeOPCservers.Note:Thiscommunication

methodisnotusedbyPLCs.

Modbus/TCP(Not

supportedbyModbus

Server)

Modbus/TCPisanEthernetnetworkbasedprotocolthatcontainsaModbus/RTU

message,withtheexceptionofthe2byteCRC.TheModbus/TCPmessagecontainsa

headerwithinformationdesignedtoprovidemessageidentificationandrouting

information.Theformatisasfollows:

Where:

• ThetermsMasterorClientareusedtoidentifythesenderofthemessage.

• ThetermsSlaveorServerareusedtoidentifythedevicesrespondingtothemessage.

• Modbus/TCPmessagesaretypicallysenttoandreceivedonadefinedEthernetTCP/

IPsocketof502.

• Modbus/TCPimplementationsprovidemorecapability,butalsorequiremore

processingthansimplerModbus/RTUimplementations.

Modbus/TCPisusedforconnectingadvancedEthernetbaseddevices,suchasPLCs,HMIs,

SCADASystems,andmostOPCServersto:

• OtherEthernetdevicessupportingModbus/TCP.

• RemoteserialModbus/RTUdevicesthroughgateways(suchastheDeviceMasterUP).

• RemoteserialorEthernetTCP/IPASCIIdevicesthroughagateway(suchasthe

DeviceMasterUP).

Note: RefertotheDeviceMasterUPforModbus/TCPfunctionality.

8ModbusServerApplicationOverview DeviceMasterModbusServerUserGuide:2000535Rev.B

ModbusServerFunctionality

ModbusServerFunctionalit y

TheModbusServerapplicationprovidesthefollowingfunctionality:

• SupportsModbus/RTUoverEthernetTCP/IPconnectionstothecorrespondingserial

portthroughintelligentModbusmessagehandlingandrouting.

• SupportsonlyModbus/RTUoverEthernetTCP/IPconnectionstoaserialport.

Note: ForModbus/TCPfunctionality,refertheDevice MasterUP

• SupportsuptosixEthernetTCP/IPconnectionstoeachserialport.

‐ OneTCP/IPconnectioncanbecreatedwiththeConnectToconnectionmethod.

‐TheListenconnectionmethodacceptsuptofiveorsixconnections,dependingif

theConnectToconnectionisactive.

• Supportsupto255Modbusdevicesperport.Bothvalid,(1‐247),andreserved,(248‐

255),deviceIdsaresupported.

• Modbus/RTUspecificmessagehandling:

‐ CRCverificationofallmessagesreceivedontheTCP/IPandserialinterfaces.

‐ TimingoutofresponsesfromslaveModbus/RTUdevices.

‐ Broadcastmessagehandlingonconnectedportonly.

• Systemmonitoringtoensuregatewayoperation:

‐Gatewaybusy.

‐ Applicationmessagetime‐outs.

• Advanceddiagnosticswebpages:

‐ Modbus/RTUdevicespecificstatisticsandstatus.Upto255Modbus/RTUdevices

perportcanbemonitoredsimultaneously.

‐ Serialportspecificstatistics,responsetiming,andstatus.

‐Serialportmessagelogging.

DeviceMasterModbusServerUserGuide:2000535Rev.B ModbusServerApplicationOverview9

ModbusServerFunctionality

• Combinedwithaserialportredirector,suchastheComtrolSecurePortRedirector,

cansupportuptosixCOMportconnectionstoeachserialport.

10ModbusServerApplicationOverview DeviceMasterModbusServerUserGuide:2000535Rev.B

ModbusServerFunctionality

DeviceMasterModbusServerUserGuide:2000535Rev.B InstallationOverview11

InstallationOverview

UsethissectiontolocatesoftwareandinstallationdocumentationfortheDeviceMasterto

quicklyinstallandconfigureModbusServer.

Aninstallationfollowsthesebasicsteps.

1. ConnecttheDeviceMastertothe

network.

Ifnecessary,usetheappropriate

hardwareinstallationdocumentfor

yourDeviceMaster.

2. InstallPortVisionPlusfromtheCD

ordownloadandinstallthelatest

version.

YoucanrefertotheInstalling

PortVisionPlussubsectiontolocatePortVisionPlusandinstalliteasily.

3. ConfiguretheDeviceMasternetworksettingsusingPortVisionPlus(Configuringthe

NetworkSettingsonPage12).

4. YoumustuploadtheModbusServerfirmwareintotheDeviceMasterusing

PortVisionPlus(UploadingModbusServer

onPage14).

5. ConfiguretheportcharacteristicsusingtheDeviceMasterembeddedwebpage

(EmbeddedWebPages

onPage15).

6. Connectanyserialdeviceordevicesusingtheappropriatehardwareinstallation

documentforyourDeviceMaster.

InstallingPortVisionPlus

UsePortVisionPlustoidentify,configure,update,andmanagetheDeviceMasteronthe

followingoperatingsystems:

• WindowsXP

• WindowsServer2003

• WindowsVista

• WindowsServer2008

• Windows7

PortVisionPlusrequiresthatyouconnecttheDeviceMastertothesamenetworksegment

astheWindowssystemduringtheconfigurationprocess.

Note: IfyouhaveapreviousversionofPortVisionPlusonyoursystem,usetheControl

PaneltoremovePortVisionPlusbeforeinstallingthelatestversion.

UsetheSoftwareandDocumentationCDthatcamewiththeDeviceMastertocheckforthe

latestversionofPortVisionPlusorusethelinkbelowtodownloadthelatestversion.

1. Executethepvplus_[version].msifileandfollowtheinstallationwizardusingoneof

thefollowingmethods:

• CDInstallation:UsetheCDmenusystemtochecktheversionontheCDagainst

thelatestreleasedversion.

• Downloadthelatestversion:ftp://ftp.comtrol.com/dev_mstr/portvision_plus/

2. ClickLaunchandFinishinthelastinstallationscreen.

HardwareInstallationDocuments Web

DeviceMasterInstallationand

ConfigurationGuide

DeviceMasterUPHardware

InstallationandConfigurationGuide

12InstallationOverview DeviceMasterModbusServerUserGuide:2000535Rev.B

InstallationOverview

3. ClickScansothatPortVisionPluslocatestheDeviceMaster.

Note: PortVisionPluslocatesallDeviceMastermodels,including:theDeviceMaster

500,DeviceMasterAIR,DeviceMasterPRO,DeviceMasterRTS,DeviceMaster

SerialHub,andDeviceMasterUP.

4. GotoStep4

inthenextsection,ConfiguringtheNetworkSettings,toprogramthe

DeviceMasternetworksettings.

IfyouneedadditionalinformationaboutPortVisionPlus,refertotheHelpsystem.

ConfiguringtheNetworkSettings

UsethefollowingproceduretochangethedefaultnetworksettingsontheDeviceMaster

foryournetwork.

Note: TechnicalSupportadvisesconfiguringonenewDeviceMasteratatimetoavoid

devicedriverconfigurationproblems.

ThefollowingprocedureshowshowtoconfigureasingleDeviceMasterconnectedtothe

samenetworksegmentastheWindowssystem.

1. Ifyouhavenotdoneso,installPortVisionPlus(InstallingPortVisionPlus

onPage11).

2. StartPortVisionPlususingthePortVision PlusdesktopshortcutorfromtheStart

button,clickPrograms,Comtrol,PortVision Plus.

3. IfthisisthefirsttimeyouhaveopenedPortVisionPlus,clickScanandthenYesto

locateDeviceMastersonthenetwork.

Note: PortVisionPluswilllocateallComtrolDeviceMastermodels,including:

DeviceMaster500.DeviceMasterAIR,DeviceMasterPRO,DeviceMasterRTS,

DeviceMasterSerialHub,andDeviceMasterUP.

4. HighlighttheDeviceMasterforwhichyouwanttoprogramnetworkinformationand

opentheConfigure Devicescreenusingoneofthesemethods.

• Double‐clicktheDeviceMasterintheListViewpane.

•ClickConfig.

• Right‐clicktheDeviceMasterintheListViewpaneandclickConfigure Device.

Note: SeethePortVisionPlusHelpsystemfor

informationaboutusingPortVision

Plus.

DefaultNetworkSettings

IPaddress:

192.168.250.250

Subnetmask:

255.255.0.0

Gatewayaddress:

192.168.250.1

TreeView

ListView

DeviceMasterModbusServerUserGuide:2000535Rev.B InstallationOverview13

ConfiguringtheNetworkSettings

5. Optionally,renametheDeviceMasterintheDevice Namefield.

6. ChangetheDeviceMasternetworkpropertiesasrequiredforyoursite.

• IfyouwanttoruntheDeviceMasterusingtheMACaddressingscheme,click

Disable IP.

•TousetheDeviceMasterwithDHCP,clickDHCP IP,andmakesurethatyou

providetheMACaddressofthedevicetothenetworkadministrator.Makesure

thattheadministratorreservestheIPaddress,subnetmaskandgatewayaddress

oftheDeviceMasterintheDHCPserver.

• ToprogramastaticIPaddress,clickStatic IPandentertheappropriatevaluesfor

yoursite.

Note: Foradditionalinformation,openthePortVisionPlusHelpsystem.Accessthe

HelpsystemusingtheHelpbuttonorgodirectlytothehelpforaspecific

propertypagebyclickingtheContextmenubutton( ).

7. ClickApply ChangestoupdatethenetworkinformationontheDeviceMaster.

8. Optionally,clickSave Settings to a File tocreateaconfigurationfilethatyoucanuseto

configureotherDeviceMasters.

IfyouaredeployingmultipleDeviceMastersthatsharecommonvalues,youcansave

theconfigurationfileandloadthatconfigurationontootherDeviceMasters.

9. ClickClosetoexittheConfigureDevicewindow.

14InstallationOverview DeviceMasterModbusServerUserGuide:2000535Rev.B

InstallationOverview

UploadingModbusServer

UsethissectiontouploadModbusServerontheDeviceMasterusingPortVisionPlus.

1. MakesurethatyouhavelocatedordownloadedthelatestModbusServerversion

2. Right‐clicktheDeviceMasterforwhichyouwanttoupdate,clickUpload Firmware,

browsetotheModbusServer.binfile,andthenclickOpen.

3. ClickYe stotheUploadFirmwaremessagethatwarnsyouthatthisisasensitive

process.

Itmaytakeafewmomentsforthefirmwaretouploadontothedevice.Thedevicewill

rebootitselfduringtheuploadprocess.

4. ClickOk totheadvisorymessageaboutwaitingtousethedeviceuntilthestatusreads

ON-LINE.Inthenextpollingcycle,PortVisionPlusupdatestheListViewpaneand

displaysthenewSocketServerversion.

DeviceMasterModbusServerUserGuide:2000535Rev.B EmbeddedWebPages15

E m b e dde d WebPages

Allconfigurationandstatusinformationisprovidedthroughembeddedwebpagesfor

ModbusServer.

Note: ThelatestModbusServerfirmwaremustbeinstalledbeforeyoucanconfigure

networkorserial/socketportcharacteristics.

Forfirmwareinstallationandsetupinformation,seeInstallationOverview

onPage11or

thePortVisionPlushelpsystem.

Thissectiondiscussesthefollowing:

• Configurationoverview(below)

• ServerConfiguration(Main)Page

onPage16

• SerialInterfaceConfigurationPage

onPage17

• EditPortConfigurationPage

onPage18

• EditNetworkConfigurationPage

onPage21

SeetheEmbeddedDiagnosticandStatisticsPages(Page23)sectionforinformationabout

locatingdiagnosticandstatisticsforModbusServer.

ConfigurationOverview

ThefollowingoverviewshowshowtoaccesstheDeviceMasterServerConfiguration

embeddedwebpageandconfigureserialdeviceinterfaces.

Note: IfyouhavenotconfiguredthenetworkinformationintotheDeviceM asterduring

initialsetup,youmustconfigurethenetworkinformationbeforeconfiguringport

characteristics.

1. FromPortVisionPlus,highlightthe

DeviceMasterthatyouwanttoconfigureand

selectWeb Manager.

2. Optionally,entertheIPaddressofthedevicein

theAddressboxofyourwebbrowse.

3. SelectSerial Interface Configuration.

4. SelecttheappropriateporttoaccesstheEdit

PortConfiguration pageforthatport.

5. Changetheserialportconfigurationproperties

asrequiredforyoursite.

16EmbeddedWebPages DeviceMasterModbusServerUserGuide:2000535Rev.B

ServerConfiguration(Main)Page

AccessthemainDeviceMasterwebpage(Server

Configuration)fromPortVisionPlusorentertheIP

addressoftheDeviceMasterintheAddress boxof

yourwebbrowser.

TheServerConfigurationpagedisplaysthesoftware

versionandcurrentnetworkconfigurationforthe

DeviceMaster.

Inaddition,theServerConfigurationpagelinkstothe

configuration,statistics,anddiagnosticspages,which

arediscussedinthetablebelow.

ServerConfigurationPage

Software

ModbusServerfirmwareversion

currentlyrunningonthe

DeviceMaster.

IP Config

TypeofIPconfigurationcurrently

inuse(staticorDHCP).

IP Address

IP Netmask

IP Gateway

IPaddress,netmask,andgateway

configuredintheDeviceMaster.

Serial Interface

Configuration

OpenstheSerialInterface

ConfigurationPage(Page17),

whichprovidesanoverviewofthe

serialinterfacesettingsand

providesaccesstotheEditPort

Configurationpageforserialport

configurationontheselectedport.

Communication

Statistics

OpenstheSerialInterface

CommunicationsStatisticsPage

(Page17),whichcontainsserial

interfaceandapplication

connectionstatistics.

Display Serial

Logs

OpenstheSerialInterfaceLogs

Page(Page26),whichcontainsthe

statisticsanderrorreporting

informationforeachport.

Configure

Network

OpenstheEditNetwork

ConfigurationPage

(Page21),

whichcanbeusedtomodify

DeviceMasternetwork

configurationafterinitial

configurationusingPortVision

Plus.

Display All

Known

Modbus/RTU

Devices

OpenstheKnownModbus/RTU

DeviceListWebPage(Page23),

whichdisplaysallknown

Modbus/RTUdeviceattachedtoall

serialports.

Reboot RebootstheDeviceMaster.

DeviceMasterModbusServerUserGuide:2000535Rev.B EmbeddedWebPages17

SerialInterfaceConfigurationPage

TheSerialInterface

Configurationpageprovides:

• Linkstothefollowing

pages:

‐ ServerConfiguration

(Main)Page(Page

16)

‐ SerialInterface

Communications

StatisticsPage(Page

24)

‐ SerialInterfaceLogs

Page(Page26)

‐ KnownModbus/RTU

DeviceListWebPage

(Page23)forall

portsoraspecific

port.Clickingthe

DisplayDevices(all)

linkortheDisplay

Devicesforaspecific

port.

• AccesstotheEditPort

Configurationpagefor

eachport(Port#)

• Anoverviewofserial

deviceconfiguration

settingsforeachport,

whichdisplaysthe

currentsettings

Note: TheApplicationTCP

ConnectionStatus

displaystheRemote

Connections.

UptosixactiveTCP/IP

connectionsforeach

serialportmaybe

displayedatonetime.

Tochangeanysettingsfora

port,selectthecorrespondingPort #link,whichopenstheEditPortConfigurationpage.

Select the appropriate serial

port number to configure the

serial port characteristics.

18EmbeddedWebPages DeviceMasterModbusServerUserGuide:2000535Rev.B

EditPortConfigurationPage

EditPortConfiguration

Page

UsetheEditPortConfigurationpagetochangeaserialport’sconfigurationparameters.

ToaccesstheEditPortConfigurat ionpage,selecttheappropriateportnumberlink(for

example,Port1)ontheSerialInterfaceConfigurationpage.

UsetheSerial Configurat ionareaoftheEditPortConfigurationpagetoconfigureserial

portcharacteristicsforthedevicethatyouplanonconnectingtotheport.

DeviceMasterModbusServerUserGuide:2000535Rev.B EmbeddedWebPages19

EditPortConfigurationPage

Name Value(s) Description

SerialConfiguration

Mode

Allmodels,except2‐port

models:

• RS232(default)

• RS‐422

• RS‐485

2‐portmodels:

• RS232(default)

• RS‐422

• RS‐485_2‐wire

• RS‐4854‐wire

Master

• RS‐4854‐wireSlave

Selectableserialmodeofcommunications.

Baud Rate

300,600,1200,2400,

4800,9600,19200,

38400(default),57600,

115200,230400

Selectableserialportbaudrates.

Parity

None(default)

Even

Odd

Selectableparityvalues.

Data Bits 5,6,7,8(default) Selectabledatabitvalues.

Stop Bits 1(default)or2 Selectablestopbitvalues.

Flow

None(default)

RTS/CTS

XON/XOFF

Half‐Duplex

Selectableflowcontrolvalues.

Rx Timeout

Between

Packets

0‐65535

(default=50)

Receivetime‐outsbetweenpacketsin

milliseconds.Thisisthemaximumspacing

betweenreceivedbytesallowedbefore

Modbus/RTUmessages/responses

receivedoverboththeserialandEthernet

TCP/IPinterfaceareexpectedtobe

complete.

Note: Ifthisvalueissettoolow,incomplete

and/orinvalidModbus/RTU

messagesmaybeincorrectly

detected.

Duplicate

Serial

Configuration

For All Ports.

N/A

Ifselected,willapplytheserialport

configurationtoallserialports.

20EmbeddedWebPages DeviceMasterModbusServerUserGuide:2000535Rev.B

EditPortConfigurationPage

Modbus/RTUProtocolSettings

Device

Response

Timeout

0to65535ms.

(Default=1000ms)

Themaximumallowabletimeforaslave

Modbus/RTUtorespondtoamessage

beforethemessageisconsideredtimedout.

Discard Rx

Packets With

Errors

On/Off

(Default=On)

Ifselected,theDeviceMasterwilldropall

packetsreceivedwithparity,framing,or

overrunerrors.

Note: Modbus/RTUmessageswithinvalid

CRCswillalwaysbediscarded

independentofthissetting.

Duplicate

Modbus/RTU

Protocol for All

Ports.

N/A

Ifselected,willapplytheModbus/RTU

protocolsettingstoallserialports.

ApplicationTCPConnectionConfiguration

Enable

On/Off

(Default=On)

Ifselected,thisTCP/IPsocketinterfacewill

beenabled.

Listen

On/Off

(Default=On)

Ifselected,theTCP/IPsocketinterfacewill

listenforaconnectionatthespecified

Listen Port.

Listen Port

1‐65535

Default:

Port1=8000

Port2=8001

Port3=8002

..

PortN=800N‐1

IfEnableandListenarebothselected,

allowsacceptanceof:

Uptosixconnectionsfromexternal

applicationsifthereisnoactiveConnect-to

connection.

Uptofiveconnectionsifthereisanactive

Connect-toconnection.

Connect to

Mode

Never

Connect‐Always

(Default=Never)

IfEnableisselected,thissettingdetermines

howtoconnecttoanapplication.

IfNever,donotattempttomakea

connection.

If

Connect-Always:Alwaysattemptto

maintainaconnectiontotheapplicationat

Connect IP AddressandConnect Port.

Connect Port

1to65535

(Default=0)

Socketporttoconnectto.Usedin

conjunctionwithConnect to Modeand

Connect IP Address.

Connect IP

Address

StandardIPaddress

format:

xxx.xxx.xxx.xxx

IPAddressofapplicationtocreatea

connection.Usedinconjunctionwith

Connect to ModeandConnect Port.

Disconnect

Mode

Never

Idle

(Default=Never)

Modeonwhichtodisconnectfromthe

application.

Never–Willnotdisconnectwhen

connection(s)areidle.(Typicallyusedin

ListenandConnect-Alwaysmodes.)

Idle–UtilizestheIdle Timertodetermine

whentoclosetheconnection.

Name Value(s) Description

Comtrol DeviceMaster UP – Modbus Server User guide

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