Sanyo 550 Computer interactive interfacing main protocol, Physical Layer Definition

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7.3. Computer interactive interfacing: main protocol

This section defines fully the serial communications protocol implemented in the Format 550 Controller used on Sanyo Gallenkamp chambers and rooms. This protocol allows a master computer (System Master) to communicate with one or more Controllers on a network.

Typical applications include:

where the chamber is required to operate interactively with the test proce- dure being applied to the test load within the chamber

where a simple record of the conditions of the chamber is required di- rectly into a logging system already being used.

The document describes in detail what a master computer should do to comply with the protocol.

This makes no assumption about the functionality of the master software. A particular Host Software package is available separately.

The protocol is defined in four layers:

Physical Layer defining electrical connections between controller & master

Frame Layer defining byte frame structure

Packet Layer defining information flow between controller & master

Information Layerdefining syntax of information passed

7.3.1 PHYSICAL LAYER DEFINITION

 

The medium used to connect Controllers) to master depends on:

 

the distance between master & Controller

 

the number of Controllers

 

Master to single Controller: Up to 50 feet

RS232

Up to 1000 feet

RS485

Master to several Controllers:

RS485 bus.

The Chamber itself has a 25 pin RS232 port (connector 'D' type DTE) which is used for communicating with the master. A RS232 to 485 adapter is used when a RS485 hook up is required. The adapter uses the RS232's RTS line to control the data direction oftheRS485port.

7.3.2COMMUNICATIONS FRAME DEFINITION

19,200 baud

1 start bit

8data bits

0parity bits

1 stop bit

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Contents Environmental Chamber Sanyo GallenkampCustomer De Ronde Programming system Contents Part ONE the Cabinet Health & Safety at Work Sanyo Gallenkamp service & maintenance facilitiesIntroduction Commissioning U.K. Customers onlySpecification Physical Cabinet DataExterior/finish InsulationShelf False roofOptional Facilities Specification PerformanceCF1 Format 550 Digital Channels Digital Channel Cooling MainSystem Channel Digital Channel Cooling AuxiliaryDigital Channel 8 Voltage Free Terminal VFT User Programmable ChannelDESCRIPTI0N Principle and AirflowTemperature Control HeatingCooling Refrigeration unit controlVapour phase generation Relative Humidity RHRelative Humidity Determination Relative Humidity ControlRelative Humidity Decrease Installation Accessories & SparesPositioning Cabinets not requiring on-site commissioningInstrument compartment Ambient Temperature Power SupplyMains Interrupt Bridge DrainDistilled Water Supply WetwicksTest Load Protection Either13. RS232 Connector Safety ThermostatCable Port VentINDICATORS/PUSHBUTTONS Reset Amber pushbuttonControl Panel Instrumentation MainsCabinet and Program Start UP Cabinet and Program Shut DownTo Start the Cabinet To Shut Down the Cabinet Normal SequenceMaintenance and Care Maintenance ScheduleWeekly or between tests MonthMaintenance Methods Interior and exterior cleaningCleaning of cabinet drains Inspection and replacement of the wet wicksCheck safety thermostat Clean the refrigeration condenserLubrication Distilled water filterAppendix 1 Part Numbers Installation MaintenanceAppendix 2 REC/W Water System OperationDeioniser replacement System drainingContents Part 2 Format 550 InstructionsIntroduction to Format Format digital channelsHow to use these instructions Getting started Menu systemUsing the data entry windows Using the on-line helpFunction keys Status bar Types of data entry fieldPage Condition setting General Operating Sequence Steady State ModeResetting steady state setpoints Condition monitoringEnding manual control General Operating Sequence Entering a NEW Program General Operating Sequence Running a ProgramCondition C %RH Status Logging Main MenuHow to use Format programming sheets Writing a ProgramSelecting digital channels when you know best Entering the data into the programmerLoading and saving programs Running a program LogProgram Monitor Window Holding a programProgram deletion Program completionView program graph Starting Data Logging Introduction to Data LoggingLog Displaying Results Stopping Data LoggingLoading into Spreadsheets Introduction to Alarms Setting AlarmsPage C0MPUTER Interfacing IntroductionComputer Interactive Host PC System RequirementsInstallation Installing the Security KEYConfiguring the Host Software Setting UP OFF-LINE Chamber IntelligenceMain Menu Network Monitoring ModeSteady State Control Logging ProgramPrintouts Program Physical Layer Definition Computer interactive interfacing main protocolCommunications Frame Definition Packet Count HeaderSerial Number Length Compatibility with RS485 Multi-Controller Configuration Data Block LengthSerial Number Data BlockController Configuration Request Controller ConfigurationPacket Flow Summary Functional Layer Definition129 Status RequestPage Open File for Reading Close File Read DataOpen File for Writing Write Block to FileSET Controller to Local Access Mode SET Controller to Remote Access ModeSET/CHANGE Steady State Condition ENABLE/DISABLE Manual Hold ENABLE/DISABLE Guaranteed SoakDigital Channel Description Computer RS232 Format 550 socket Pin D type Cable connectionsCDR Support software Appendix 1 Technical Specification Operating temperatureOperator interface data entry Control LoopsAlarms Program Run OptionsMonitoring displays Data LoggingAppendix 2 Program Looping and Nested Loops Loop InstructionsExample Temp Hum LS Rep Digital Channels Ddhhmmss CCalculation for Succeeding Events Event statement time = event actual time total looping timeNested Loops Effects on the Running Timebase DisplaySeconds Example of Nested Loops Appendix 3 Format 550 Programming Sheets Format Programming SheetContact Information LEU ORE

550 specifications

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