Epson 214D-1 user manual Multipoint Communication, RS422 Interface HP289

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4.1.2Multipoint Communication

Multipoint Communication is a system whereby a number of instruments can be addressed over a dual twisted pair interface. Up to 32 instruments can be connected to a common bus using the RS422 and RS485 interfaces as shown below.

To convert the RS422 interface to an RS485 interface, the RS422 (-) Data In Terminal must be connected to the RS422 (-) Data Out Terminal and the RS422 (+) Data In Terminal must be connected to the RS422 (+) Data Out Terminal. These connections will convert the RS422 4 wire interface to the RS485 2 wire interface, as shown in Figure 2.

Each instrument can be configured with a unique address which is used by the Master Controller (e.g., an IBM/PC) to identify each instrument. The Controller will send the address down the line and will alert the relevant instrument. Subsequent software protocol will control the flow of data between the Controller and the Instrument.

Figure 1 RS422 Interface

HP289

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Contents USER’S Manual HP289 HFC Warranty Contents HP289 Introduction Model 214D- a Model Number DesignationIntroduction 2A Introduction 2B This page intentionally left blank HP289 General SpecificationPulse Output Operation Front Panel Operation Setting the Batch QuantityDisplayed Information ResettingStarting a Batch StoppingAccumulated Total Limit on Batch SizeBatch Operations Page Control Relays Flow Alarm Signal TimeoutEnd-of-Batch End-of-Batch SignalAuto Restart Automatic Overrun Compensation Calculation of Rate and Total Frequency Input = fxHFiltering 103 For Example Total ConversionOutput Pulse and Flow Alarm Page RS232/422/485 Interface Option OptionsHardware RS422 Interface HP289 Multipoint CommunicationRS485 Interface HP289 Printer Communication ProtocolComputer RUN ConfigurationPage Base Configuring the Setup ParametersStep Display Description Text Entering the Batch Parameters Signal Timeout in seconds Setting to Disables this featureDis EOB Date Configuring the OptionsEcho Checking the Input Signal Input Circuit for the 214D Series Input CircuitsGeneral Specification Switch SettingsInput Circuits Frequency Input Circuit HP289 Page Page Remote Key Switches General InstallationRC Networks for Interference Suppression Terminal RS232/422/485 Option Terminal Wiring DesignationsTerminal Relay Option & Switches TerminalDescriptionTrouble Shooting Counting erratically No end of batch, pulse output, or flow alarmInstrument acting erratically Configuration Errors Error CodesInput Errors Output ErrorsFront Panel IndexTerminal Wiring

214D-1 specifications

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