Tyco 1540 manual Serial Communications, RS485 Port Modbus or JC N2, Modbus Implementation

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6 Serial Communications

6.1. RS485 Port – Modbus or JC N2

0240

0340

0440

0640

1000

1540

Option

INTEGRA 1000 and 1540 offer the option of an RS485 communication port for direct connection to SCADA systems. This port can be used for either an RS485 Modbus RTU slave, or as a Johnson Controls N2 protocol slave. Choice of reply protocol is made by the Integra on the basis of the format of request, so that a Modbus request receives a Modbus reply, and an N2 protocol request receives an N2 protocol reply.

6.2 Modbus® Implementation

This section provides basic information for the integration of the product to a Modbus network. If background information or more details of the Integra implementation is required please refer to our “Guide to RS485 Communications and the Modbus Protocol”, available on our CD catalogue or from any recognised supplier.

The Modbus‚ protocol establishes the format for the master's query by placing into it the device address, a function code defining the requested action, any data to be sent, and an error checking field. The slave's response message is also constructed using Modbus protocol. It contains fields confirming the action taken, any data to be returned, and an error-checking field. If an error occurs in receipt of the message, or if the slave is unable to perform the requested action, the slave will construct an error message and send it as it’s response. Framing errors receive no response from the Integra.

The electrical interface is 2-wire RS485, via 3 screw terminals. Connection should be made using twisted pair screened cable (Typically 22 gauge Belden 8761 or equivalent). All "A" and "B" connections are daisy chained together. The screens should also be connected to the “Gnd” terminal. To avoid the possibility of loop currents, an Earth connection should be made at only one point on the network.

Line topology may or may not require terminating loads depending on the type and length of cable used. Loop (ring) topology does not require any termination load.

The impedance of the termination load should match the impedance of the cable and be at both ends of the line. The cable should be terminated at each end with a 120 ohm (0.25 Watt min.) resistor.

A total maximum length of 3900 feet (1200 metres) is allowed for the RS485 network. A maximum of 32 electrical nodes can be connected, including the controller.

The address of each Integra 1000/1540 can be set to any value between 1 and 247. Broadcast mode (address 0) is not supported.

The maximum latency time of an Integra 1000/1540 is 150ms i.e. this is the amount of time that can pass before the first response character is output. The supervisory programme must allow this period of time to elapse before assuming that the Integra is not going to respond.

56 Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03

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Contents Energy Division Crompton Switchboard Integra Contents Setting up Specification Maintenance Appendix a CE Declaration of Conformity Basis of measurement and calculations Serial CommunicationsIntroduction THDUnit Characteristics 3 0440Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03 Default display Secondary Voltage Maximum PowerDemand Calculation Pulse Output Option RS485 Serial OptionAnalogue Output Option Layout Display ScreensStart Up Screens System Screen Line to Neutral Voltages System %THD ScreenLine to Neutral Voltage %THD Line to Line Voltages %THD Line to Line VoltagesLine Currents Power Neutral Current, Frequency and Power FactorLine Currents %THD Active Energy kWh Reactive Energy kVArhMaximum Demand DemandOver Range Error Messages Setting upKWh and kVArh Display Range Number Entry Procedure Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03 Access with No Password Protection AccessAccess with Password Protection Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03 Changing the Password Full Scale Current Potential Transformer Primary VoltageIntegra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03 Potential Transformer Secondary Value Demand Integration Time Resets Pulsed Output, Pulse Duration Pulse Rate 12 RS485 Baud Rate 13 RS485 Parity Selection 14 RS485 Modbus Address Reverse Operation Analogue Output Set UpSecond Channel Reduced output rangeReading Top A1rt or A2rt Analogue Output Scaling ExampleReading A1r or A2r Reading Bottom A1rb or A2rbOutput Bottom A1ob or A2ob Power FactorSummary USA Reading European Convention North American Convention Output Phase Angle L1-L2 Calculated Parameter Number Wire Reading Parameter Selection A1r or A2rReading Top A1rt or A2rt Reading Bottom A1rb or A2rb Specification Display Only VersionsDisplay/Transducer Combined 0240, 0340, 0440 121 240V L-L 70.1 139V L-N Accuracy Measuring RangesReference conditions of influence quantities Display/Tranducer Combined 1000 Auxiliary Power Supply Reference conditions Screen Nominal range of use of influence quantities for measurandsFunctional ranges StandardsSerial Communications Option Modbus RS485Active Energy Pulsed Output Option Integra 1540 OnlyEnergy resolution Reactive and Apparent PowerBasis of measurement and calculations Total Harmonic Distortion 1540 only RS485 Port Modbus or JC N2 Serial CommunicationsModbus Implementation Input Registers Parameter Modbus Start Modbus Holding Registers and Integra set up High Low ByteApplication details RS485 Implementation of Johnson Controls MetasysMetasys release requirements Support for Crompton Integra operation Support for Metasys IntegrationDesign considerations Metasys N2 application Integra 1560/1580 Point Mapping tableMaintenance Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03 Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03 Integra 1540, 1000, 0640, 0440, 0340, 0240 Issue 1 04/03

1540 specifications

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