Omega Vehicle Security 1500 J

API Command Reference Appendix A

A-30 NetScan User’s Manual

J - Calibrate Cold Junction Offset

TYPE

Calibration

EXECUTION

Immediate

SYNTAX

Jchan,

type,

temp

Calibrate the cold-junction offsets for cold-junction compensat i on of t he

thermocouple signals where chan is the channel number such that

1 < chan < max, where max = 128 for NetScan.

type is the thermocouple channel type.

temp is the reference temperature currently being applied to the selected

channel, with the form nnn.n in degrees º C.

DESCRIPTION

Note: This command is only for advanced users who perform their own calibration. It i s not necessary for

normal, everyday operation.

Active only in calibration mode, the Calibrate Cold Junction Offset (J) c om mand is used to calibrate the cold

junction offsets for cold-junction compensation of the therm oc ouple signals. Each thermocouple input channel

has associated with it one of these temperature sensors. Although calibrat ed at t he factory, these temperature

sensors are subject to component aging which may affect their accuracy over t i m e. The function of the Calibrate

Cold Junction Offset (J) command is to allow the adjusting of the internal f i rm ware to compensate for the affects

of component aging.

Since there are 4 cold junction temperature sensors associated with 32 temperat ure i nput c hannels, it is

necessary to select 4 channels. Each channel is associated with one of the 4 c ol d j unc tion temperature sensors

in order to calibrate all cold junction temperature sensors on a given card.

Note: Four separate channels on each card must be supplied with an accurate thermocouple si gnal of known

warm junction temperature.

The parameter type is the same channel type that is used with the Configure Channels (C) comm and.

After the command has been issued, the applied thermocouple signal m ust remain at its value until the trigger

LED stops flashing in order to achieve accurate results. For further details on c hannel c alibration, see Chapter 6.

EXAMPLE

PRINT#1, “K12345X”

‘ Enter Calibration Mode

‘ Apply precision temperature

PRINT#1, “J1,2,101.7X”

‘ Compute cold junction offset for the temperature

sensor associated with the type K thermocouple

on channel 1 of card #1, at 101.7°C

‘ Wait for command to complete

‘ Remove precision temperature

PRINT#1, “EX”

‘ End calibration mode

Contents

Main OMEGAnetSM On-Line Service http://www.omega.com Internet e-mail info@omega.com Servicing North America: USA: Canada: How To Use This Manual Appendices Table of Contents 1 Configuring and Starting NetScan 2 ChartViewNET QuickStart and Tutorial 3 - General Information and Specifications 4 ChartView Software Reference 6 Calibration 7 Hardware Setup Appendices Page Configuring and Starting NetScan 1 Inspect Your System Check and Install Hardware Verify Voltage Setting Verify DIP Switch Settings Page Setup for Ethernet Operation Complete Hardware Setup for Ethernet Operation Install Software/Configure Address Settings for Ethernet Operation Page Page Page Configuration Connect Channel Signal Inputs DB50 Pin Descriptions Page ChartViewNET Quick Start and Tutorial 2 ChartViewNET, Basic Concepts Configuration Files Understanding Groups, Charts, & Channels Three Ways of Using ChartViewNet ChartViewNET Quick Start Starting ChartView, Configuring the System and Collecting Data Page Page ChartViewNET Tutorial 1. Select Interface Device (1) From Windows, start ChartView by double-clicking on the (2) Choose the Select Device button. The Select Interface (3) Select Simulated Instrument. In an actual application you 2. Configure Chart Setup (5) Verify that the Advanced tab (under Automatic Chart Creation) is selected. (6) Choose 2 for the number of groups. [Standard program is limited to 1 group]. (7) Choose 3 for the number of charts. (8) Choose 4 for the number of channels. (9) Click Automatic Chart Creations/Create Charts. At this point your chart 3. Configure Channels & Alarms 4. Configure Acquisition. 5. Review Configuration. (20) (21) (22) (23) 6. [Optional]. Save Configuration File. 7. [Optional]. Check the System Inventory and Device System Time. 8. Start Charts. A Note In Closing. General Information and Specifications 3 General Description Operational Aspects Data Handling and Triggering Software and Hardware NetScan Specifications General Channels Triggers Data Storage & Format Digital I/O Interface & Alarms Calibration Page ChartView Software Reference 4 ChartView, ChartView Plus, ChartViewNET, and ChartViewNET Plus Groups, Charts, & Channels Three Ways of Using ChartView Some of the data acquisition scenarios pertaining to ChartView are as follows: Four Basic Data Acquisition Scenarios What ChartView and ChartView Plus Provide Main Window Page Channel Information Region Status Indicator Region Main Window Toolbar Group Select Start, Pause, and Stop Charts Scroll Faster & Scroll Slower Display Configuration Page Page Page Page Page Channel Configuration PostView post-acq data viewer Arm Acquisition Disarm... Print Charts Main Window Pull-Down Menus File File Menu Note Chart View Page Acquire Data Upload Data During Acquisition Stop Upload Window Device Setup IEEE 488 Setup RS-232/422 Page Page Device Setup Bar Graph, Analog, and Digital Meters Overview Bar Graph Meters Analog Meters Digital Meters Meter Toolbars Meter Pull-Down Menus Meters Configuration Menu Configuring a Meter Setup Window Channel & Alarm Setup Dialog Box Page Page Acquisition Setup Dialog Box Page Acquisition Setup Dialog Box, High-Speed, Single-Channel Mode Acquisition Setup Data Destination Dialog Box Page Chart Setup Wizard Automatic Chart Setup with Wizard Bypassing Automatic Chart Setup Page PostView 5 Data File Accessibility Introduction Starting PostView Toolbar PostView Toolbar Items Channel Information Region Menu Items File Go To Options Help Understanding Groups, Charts, and Channels Chart Setup Wizard Automatic Display Creation Display Configuration Editing a Display Page Manually Creating a Display Page Page PostView Timebase Page Calibration 6 Introduction Calibration Setup Non-Volatile Storage of Calibration Constants Hardware Protected RAM ScanCal Software Application ScanCals Main Window Using ScanCal Interface Parameters System Inventory Calibration Calibration Without ScanCal Password Mode Indicator Command Active Indicators Calibration of Main Unit Page Page Page Calibration of Signal Conditioning Cards Offset Calibration of Cards Page Gain Calibration of Low Volts Cards Page Page Page Page Cold Junction Calibration Page Page Page Hardware 7 Front Panel Rear Panel NetScan Rear Panel Power Aspects Changing the Voltage Setting Replacing the AC Power Supply Fuse Memory Configuration Expanded Memory Options Page Calibration Memory Write Enable/Disable Ethernet Interface Configuration RS-232/422 Interface Configurations Configuring RS-232/422 Parameters Serial Port Pin Connectors Serial Port Pin Connector Signals for RS-232/422 Applications Digital I/O Lines Logic Levels Digital I/O Port Pinout External TTL BNC Connectors Signal Conditioning Cards CSN14/TC/P Page CSN14/LV/ (T, B, & S) CSN14/HV/S CSN14/HV/S, High Voltage Card with Safety Jack Connectors CSN/Relay Card CSN/Relay Card Specifications Expansion Chassis, CSN/Exp (Option) Connecting the Expansion Chassis Page Automatic Channel Assignment Expansion Chassis Specifications Appendices Page Appendix A API Commands Command Syntax Case Sensitivity Spaces Multiple Parameters Command Strings Command Interpretation Immediate & Deferred Commands Page Deferred Commands, Order of Execution Command Summary Page Page Page Command Reference Command Description Format Type Execution The Commands @ *B *C *F *K *P *R *S *T A A# C Page C# D# E E? F Page F# G H I I# J K L M# N O P ? Q Page QC? R R# S T Page U Page Page Page V W# X Y Page Appendix B Ethernet API Reference Functions nSWInit nSessionBegin nIOLock nSERIALConfigure nSerialReceive nSerialSend nSessionEnd nSwDeinit Appendix C Configuration Aspects for Programmers Memory Allocation Measuring Modes Overview Normal Mode High-Speed, Single-Channel Mode Configuration Requirements Channel Configuration CSN14/TC/P Configuring Thermocouple Channels CSN14/LV/ (T, B, or S) Configuring Low Volts Channels CSN14/HV/S Configuring High Volts Channels Scan Configuration Configuring a Scan Configuring the Scan Interval Acquisition Configuration Pre-Trigger State Continuous, Gap-Free Acquisition with Two Timebases Page Post-Trigger State Post-Stop State Trigger and Stop Events Page Time Stamping ( *T Alarm Stamping ( A# Digital Input Stamping ( I# Page Acquisition Buffer, A Description Trigger Block Organization Page Multiple Trigger Blocks Acquisition Buffer Interrogation Page Page Reading the Acquisition Buffer Page Configuring Alarms Alarm Set Points Digital Alarm Outputs Set Point Hysteresis Digital I/O Operation Appendix D Registers, Data Formats, & Queries Using High/Low/Last (HLL) Registers HLL Register Contents Accessing HLL Registers Page Page Data Format (F) Data Input Formats Data Output Formats Engineering Units Data Format Page Binary Data Format Counts Data Format Configuring Power-Up State Queries Query (?) Commands U Status Commands Status, Event Reporting, and Mask Registers Theory of Operation Page Calibration Status Register (U2 Command) Error Source Register (E? Command) Event Status Register Event Status Enable Register Status Byte Register Using Status Reporting Registers Trigger Latency Trigger Overrun Buffer Overrun Buffer Overrun With One Trigger Block Buffer Overrun With Multiple Trigger Blocks Real Time Clock Open Thermocouple/Range Error Checking Page Page Appendix F ASCII Code Summary A ASCII Code Details Decimal Values 00 to 31 ACG & UCG Descriptions Page Appendix G NetScan Error Messages Page Appendix H Abbreviations Page Index -A- -C- -D- -E- Page WARRANTY/DISCLAIMER RETURN REQUESTS/INQUIRIES TEMPERATURE PRESSURE, STRAIN AND FORCE FLOW/LEVEL pH/CONDUCTIVITY DATA ACQUISITION