Omega Speaker Systems VR200 Installing the RS-422-A Interface, Interface Specifications

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1.1 Interface Specifications

Chapter 1 INSTALLING THE RS-422-A INTERFACE

The option /C3 provides the VR200 view recorder with the EIA (Electronic Industries Association) RS-422-A communication interface to allow a host computer to do the following:

•read measured values,

•read parameters, and

•set parameters.

However, this interface does not allow the host computer to operate the power switch of the VR100VR200 nor control the parameters which can only be set in the SETUP mode on the VR100VR200.

1.1 Interface Specifications

Communication System:

4-wire, half-duplex, multi-drop connection

 

1:n (1 = host computer and n = VR200 view recorders,

 

n = 1 to 16)

 

Start-stop (asynchronous) system

Transmission speed:

1200, 2400, 4800, or 9600 bits/s

Start bit:

1 bit

Stop bit:

1 or 2 bits

Parity:

Even, odd, or none

Word length:

7 or 8 bits

Electrical signal characteristics:

EIA standard electrical characteristics for the

 

interchange signals and associated circuitry.

 

Functional isolation.

Communication distance:

Up to 500 meters (between an isolated line converter

 

or an isolated-output computer and a VR200 recorder)

1 INSTALLING THE RS-422-A INTERFACE

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Contents
User’sGuide Servicing North America Preface TrademarksContents Time Chart Initial Status Errors During RS-422-A Output Transmitting FunctionsProgram Examples Installing the RS-422-A Interface Interface SpecificationsInterface Terminal Terminal Assignment Cable TerminationCommunication Wiring Data ConfigurationStart-stop Asynchronous Communication TextInput Buffer Buffer OverflowSetting up the RS-422-A Communication Interface Setup ProcedureIdentifier ParametersTerminator Format SRp1,mode List of Program Set CommandsSetting the Range and Scale Example SR01,SKIPFormat SRp1, mode, p2 Example SR01, DI,Format SRp1, mode, p2, p3, p4, p5, p6, p7, p8 Setting Alarms Setting the Clock Setting the UnitSetting the Waveform Span Rate TIME/DIV Copying the Channel SettingsSetting the Discrete Zone Display Setting the Partial Expanded DisplaySetting the Tag Setting the Trip Level Setting the Data File Name FileSetting the LCD Brightness and LCD Saver LCD Setting the Summer/ Winter Time DSTFormat MDp1, p2, p3 Example MD02, ON, onStandard Screen Call List of Program Control CommandsAlarm Acknowledge Initializing the Data MemorySelecting the Output Data Loading the SET Configuration FileSaving the SET Configuration File Selecting the Output Format for Measured DataMessage Writingfor the VR 200 with style number 2 or higher Execution of Trigger Status OutputRequests for the data to be prepared in the buffer ESC O Crlf Open CommandClose Command ESC C CrlfIntroduction to Output Data Formats Sequence see also Sections 2.3.7Output Format of Measured Values in Ascii Mode Output Data FormatsOutput Format of Measured Values in Binary Mode Output Format of Parameter Settings Output Format of Unit and Decimal Point Information Time Chart Initial Status Preventing Errors OutputHow to Request Error Message Output ESC S CR LFTiming of Resetting the Error Status Program Examples EnvironmentOpen TEST.DAT for Input AS #2 Others LF is sent automatically 210 ‘ 220 ‘ Open COM11200,N,8,1,LF AS #1 Print a Appendix Appendix 1 Ascii Code TableLowercase/Uppercase Letters Appendix 2 File Naming RulesFile Name Length System-reserved File NamesIndex Index for Command Reference Warrant Y/ Disclaimer Temperature