Installing the RS-422-A Interface | Omega Speaker Systems VR200

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

Contents

User’sGuide Servicing North America Preface Trademarks Contents Time Chart Initial Status Errors During RS-422-A Output Transmitting FunctionsProgram Examples Installing the RS-422-A Interface Interface Specifications Interface Terminal Terminal Assignment Cable Termination Communication Wiring Data Configuration Start-stop Asynchronous Communication Text Input Buffer Buffer Overflow Setting up the RS-422-A Communication Interface Setup Procedure Identifier ParametersTerminator Format SRp1,mode List of Program Set CommandsSetting the Range and Scale Example SR01,SKIP Format 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 Settings Setting the Discrete Zone Display Setting the Partial Expanded DisplaySetting the Tag Setting the Trip Level Setting the Data File Name File Setting the LCD Brightness and LCD Saver LCD Setting the Summer/ Winter Time DST Format MDp1, p2, p3 Example MD02, ON, on Standard Screen Call List of Program Control CommandsAlarm Acknowledge Initializing the Data Memory Selecting the Output Data Loading the SET Configuration FileSaving the SET Configuration File Selecting the Output Format for Measured Data Message 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 Crlf Introduction to Output Data Formats Sequence see also Sections 2.3.7 Output Format of Measured Values in Ascii Mode Output Data Formats Output 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 Output How to Request Error Message Output ESC S CR LF Timing of Resetting the Error Status Program Examples Environment Open 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 Table Lowercase/Uppercase Letters Appendix 2 File Naming RulesFile Name Length System-reserved File Names Index Index for Command Reference Warrant Y/ Disclaimer Temperature