Sanyo 550 instruction manual Data Block Length, Serial Number, XOR Checksum, Packet Timing

Page 54

Data Block Length

This is set to the number of data bytes which follow in this packet. The minimum value is 1, so if there are no data bytes, this should be set to 1and the data block should contain a single null byte (value 0).

Serial Number

In Command Packets this field contains the serial number of the Controller to which the packet is intended, encoded in ASCII. In Reply Packets, this field contains the serial number of the Controller transmitting the Reply Packet.

NB: this refers to the serial number of the CONTROLLER, not the chamber.

Data Block

This field is used mainly in Reply Packets from the Controller to pass back the information requested in Command Packets from the master, although some Command Packets also have data associated with them. In general, the data bytes contained in the Data Block areprintable characters encoded in 7 bit ASCII (values 32 to 127). The bytes may contain any 7 bit value (0 to 127).

XOR Checksum

This is an "exclusive OR" checksum calculated from all bytes from the Header to the last byte in the Data Block (inclusive). The checksum is calculated as follows. A byte variable C is initialised to 128. As each byte in the packet is transmitted, each bit in C is XORed with the corresponding bit in the byte being transmitted. After all bytes have been transmitted (up to and including the last data byte), C contains the result of the checksum calculation and is transmitted.

Additive Checksum

This is a sum of all bytes transmitted in the packet up to and including the last data byte, modulo 128 (i.e. the remainder, after dividing by 128 the sum of all bytes transmitted).

Compatibility with RS485 Multi-Controller Configuration

The RTS signal on the RS232 port controls data direction on the RS485 bus. Normally, the RTS line should be left unasserted by the master. Just before the master transmits a packet, it should assert the RTS line (to drive the master's RS485 port to Output mode). After the master has completed transmission of apacket, theRTS line should be dropped within 0.05s (but not before the stop bit of the last byte has been transmitted).

The Controllers normally have their RTS lines unasserted, so that their RS485 ports are in Input mode waiting for transmissions from the master.

When a Controller is about to transmit a reply packet, its RTS line is asserted (driving its RS485 port to Output mode). After the Controller has completed transmission of a packet, the RTS line is dropped within 0.05s. This means that the master must wait at least 0.05s before raising RTS to transmit the next Command Packet.

Packet Timing

In most instances, the Controller will issue a Reply Packet in response to a Command Packet from the master within 1 second.

53

Page 53 Page 55
Image 54
Page 53 Page 55
Contents Sanyo Gallenkamp Environmental ChamberCustomer De Ronde Programming system Contents Part ONE the Cabinet Introduction Health & Safety at WorkSanyo Gallenkamp service & maintenance facilities Commissioning U.K. Customers onlySpecification Physical Cabinet DataShelf Exterior/finishInsulation False roofSpecification Performance Optional FacilitiesCF1 System Channel Format 550 Digital ChannelsDigital Channel Cooling Main Digital Channel Cooling AuxiliaryDigital Channel 8 Voltage Free Terminal VFT User Programmable ChannelDESCRIPTI0N Principle and AirflowCooling Temperature ControlHeating Refrigeration unit controlRelative Humidity Determination Vapour phase generationRelative Humidity RH Relative Humidity ControlRelative Humidity Decrease Positioning InstallationAccessories & Spares Cabinets not requiring on-site commissioningInstrument compartment Mains Interrupt Bridge Ambient TemperaturePower Supply DrainTest Load Protection Distilled Water SupplyWetwicks EitherCable Port 13. RS232 ConnectorSafety Thermostat VentControl Panel Instrumentation INDICATORS/PUSHBUTTONSReset Amber pushbutton MainsTo Start the Cabinet Cabinet and Program Start UPCabinet and Program Shut Down To Shut Down the Cabinet Normal SequenceWeekly or between tests Maintenance and CareMaintenance Schedule MonthCleaning of cabinet drains Maintenance MethodsInterior and exterior cleaning Inspection and replacement of the wet wicksLubrication Check safety thermostatClean the refrigeration condenser Distilled water filterAppendix 1 Part Numbers Appendix 2 REC/W Water System InstallationMaintenance OperationDeioniser replacement System drainingContents Part 2 Format 550 InstructionsIntroduction to Format Format digital channelsHow to use these instructions Getting started Menu systemUsing the on-line help Using the data entry windowsFunction keys Status bar Types of data entry fieldPage Condition setting General Operating Sequence Steady State ModeResetting steady state setpoints Condition monitoringEnding manual control Condition C %RH Status Logging General Operating Sequence Entering a NEW ProgramGeneral Operating Sequence Running a Program 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 completion Program deletionView program graph Introduction to Data Logging Starting Data LoggingLog Stopping Data Logging Displaying ResultsLoading into Spreadsheets Introduction to Alarms Setting AlarmsPage Computer Interactive C0MPUTER InterfacingIntroduction Host PC System RequirementsConfiguring the Host Software InstallationInstalling the Security KEY Setting UP OFF-LINE Chamber IntelligenceNetwork Monitoring Mode Main MenuSteady State Control Program LoggingPrintouts Program Computer interactive interfacing main protocol Physical Layer DefinitionCommunications Frame Definition Header Packet CountSerial Number Length Serial Number Compatibility with RS485 Multi-Controller ConfigurationData Block Length Data BlockPacket Flow Summary Controller Configuration RequestController Configuration Functional Layer Definition129 Status RequestPage Open File for Reading Close File Read DataOpen File for Writing Write Block to FileSET Controller to Remote Access Mode SET Controller to Local Access ModeSET/CHANGE Steady State Condition ENABLE/DISABLE Guaranteed Soak ENABLE/DISABLE Manual HoldDigital Channel Description Cable connections Computer RS232 Format 550 socket Pin D typeCDR Support software Operator interface data entry Appendix 1 Technical SpecificationOperating temperature Control LoopsMonitoring displays AlarmsProgram Run Options Data LoggingExample Appendix 2 Program Looping and Nested LoopsLoop Instructions 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

The Sanyo 550 is a remarkable piece of technology, encapsulating innovative features and advanced characteristics that cater to a variety of users. This device, designed with meticulous attention to detail, is particularly renowned for its versatility and user-friendly interface.

One of the standout features of the Sanyo 550 is its impressive display technology. The high-resolution screen offers vibrant colors and sharp images, making it ideal for both professional presentations and personal entertainment. Whether you're watching videos or reviewing documents, the clarity provided by the Sanyo 550's display enhances the overall user experience.

In terms of connectivity, the Sanyo 550 excels with multiple options available, including USB ports, Bluetooth, and Wi-Fi capabilities. These features allow users to seamlessly connect various devices, transfer files effortlessly, and access the internet without hassle. This level of connectivity ensures that the Sanyo 550 can function as a central hub for all your multimedia needs, whether for work or leisure.

The Sanyo 550 also incorporates advanced battery technology. With its long-lasting power supply, users can enjoy extended usage without frequent recharging. This is particularly beneficial for individuals who are constantly on the go, as it allows for uninterrupted productivity and entertainment.

Moreover, the Sanyo 550 is designed with portability in mind. Its lightweight and compact design make it easy to carry, fitting comfortably in a bag or briefcase. This feature is particularly appealing for professionals who travel frequently or students who need a reliable device for classes and study sessions.

The device is also equipped with powerful processing capabilities, enabling smooth multitasking and efficient performance. Whether running demanding applications or performing routine tasks, the Sanyo 550 maintains high performance levels, ensuring a satisfying user experience.

Lastly, the Sanyo 550 places emphasis on user satisfaction through its intuitive operating system. The interface is designed to be straightforward and accessible, allowing users of all tech-savvy levels to navigate with ease. Overall, the Sanyo 550 represents a blend of cutting-edge technology, portability, and user-centered design, making it a compelling choice for anyone in the market for a reliable and feature-rich device.
Top Page Image Contents