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Omega DP41-B Series User Manual

Omega DP41-B Series
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User’s Guide
DP41-B Series
Serial Communication Optio
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RoHS 2 Compliant

Table of Contents

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Omega DP41-B Series Specifications

General IconGeneral
Operating Temperature0 to 50°C (32 to 122°F)
CommunicationRS232 or RS485 (optional)
Display TypeLED
Input TypeThermocouple, RTD
OutputRelay
Power24V DC
Enclosure RatingNEMA 4X front panel
Display4-digit LED

Summary

1. Introduction

Customer Service

Information on how to contact OMEGA for assistance with the product.

Manuals and Software

Details on obtaining the latest Operation and Communication Manual and software.

Communication Menu

Explanation of the Communication menu's appearance and function.

2. Hardware

Definition of Terms

Defines technical terms related to serial communication interfaces like RX, TX, RTS.

RS-232 and RS-485 Hardware

Describes the physical RS-232/RS-485 option board and its installation.

4. Definitions

Meter or DCE

Defines the meter as a Data Communication Equipment (DCE) device.

Computer or DTE

Defines the computer as Data Terminal Equipment (DTE) controlling communications.

Point-to-Point Connection

Describes a direct data connection between two devices.

Multipoint (Multi-Drop)

Explains shared wiring for multiple devices on a bus, with a controller.

Simplex Communication

Defines a communication channel with unidirectional data flow.

Half Duplex Communication

Defines bi-directional data flow in one direction at a time.

Full Duplex Communication

Defines bi-directional data flow in both directions simultaneously.

RS-232 (CCITT V.24) Standard

Details RS-232 voltage levels, transmission, and sensitivity.

RTS Control Signal

Explains the 'Request To Send' signal for RS-232 control.

RS-422 Standard

Details RS-422 voltage levels, drive, and receiver characteristics.

RS-485 Standard

Details RS-485 extension for bus operation, drivers, and protection.

ASCII Character Encoding

Explains ASCII encoding, 7-bit symbols, and transmission structure.

HEX ASCII Data Format

Describes how data is stored in bytes, nibbles, and transmitted via HEX-ASCII.

Transmission Voltage Levels

Specifies receiving and transmitting voltage levels for RS-232, RS-422, and RS-485.

Recognition Character

Defines the character used for message security and command recognition.

RAM (Random Access Memory)

Explains RAM's role in storing temporary data and instructions for immediate operation.

EEPROM (Electrically Erasable Programmable Read-Only Memory)

Explains EEPROM's role in non-volatile setup and configuration data retention.

5. Baud Rates

6. Character Waveform

7. Classes of Operation

Point-to-Point Operation

Details operation without device addresses, using Continuous and Command modes.

Continuous Mode

Explains continuous data transmission, controlled by RTS, for RS-232 and RS-485.

Message Handshake

Describes how RTS controls message transmission completion.

Character Handshake

Describes how RTS controls transmission on a character-by-character basis.

Command Mode (Point-to-Point)

Explains command-driven data transmission without handshake lines.

Multipoint Operation

Details bus operation with device addresses, avoiding collisions, with Command and Alarm modes.

Multipoint Command Mode

Explains how addressed commands are received and processed by devices.

Multipoint Alarm Mode

Describes meter behavior and bus activity during multipoint alarm conditions.

Meter as Remote Display

Explains how the meter can be configured to display transmitted data.

Meter as Double Tasking Remote Meter

Details configuring the meter for simultaneous indicator and controller functions.

Command Structure for Double Tasking

Defines the command format for double tasking operations.

8. Command and Response Structure

Message String Structure

Explains the composition of messages, including data and non-data elements.

Data and Non-Data Fields

Classifies message components into DATA (values) and NON DATA (control characters).

Brackets and Spaces Usage

Explains the use of angle brackets '<>' and square brackets '[]' in message syntax.

Commands Overview

Introduces the wide range of commands and their classification by command class and suffix.

Read Communications Configuration Command

Details the '^AE' command for retrieving communication parameters.

General Command Structure

Categorizes commands by type: read/write, status, enable/disable/reset.

Command Formats

Provides specific formats for various command classes like P, W, G, R, X, V, U, D, E, Z, Y.

Command Suffix Definitions

Lists command suffixes, affected items, character count, and relevant sections.

Response Structure Overview

Details response formats based on echo mode and error conditions.

No Error Responses

Format for responses when no errors occur.

Echo Mode Responses

Response formats when echo mode is enabled.

No Echo Mode Responses

Response formats when echo mode is disabled.

Data Length in Responses

Specifies the expected data length for different command types and responses.

Error Response Handling

Describes how the meter detects and reports communication errors.

Error Response Format

Defines the format of error messages returned by the meter.

Error Message Codes

Lists specific error codes and their corresponding messages.

Error Response Descriptions

Provides detailed explanations for common command and format errors.

Status Character Formats

Explains how status characters are transmitted for alarms and peak/valley readings.

Alarm Status Characters

Details the characters representing different alarm states for setpoints.

Peak/Valley Status Characters

Describes characters indicating changes in peak and valley readings.

"V01" Response Data Format

Specifies the format of responses to the 'V01' command, including status and readings.

"^AE" Response Format

Defines the format of the meter's response to the '^AE' command.

Command Examples

Provides practical examples of commands and their expected responses.

9. Meter Bus Response

Point-to-Point or Multipoint Command Mode

Describes command processing in both point-to-point and multipoint configurations.

Meter Response Time (Command Mode)

Defines response time and provides rates for command mode operation.

Point-to-Point Continuous Mode

Explains continuous data transmission and how to interact with it.

Meter Response Time (Continuous Mode)

Defines response time for continuous mode and provides reading rates.

Communicating in Continuous Mode

Details steps to switch from continuous to command mode for communication.

Multipoint Alarm Mode Response

Describes meter behavior and bus activity during multipoint alarm conditions.

Watchdog Timer for Communication

Explains the watchdog timer's function in maintaining communication integrity.

10. Data Format Commands (P, G, R, W)

Reading Configuration (RdG.CNF)

Configures display format, flashing, and LED brightness.

Input Configuration (INP.CNF and INPUt)

Sets line frequency, reading rate, unit type, and cold junction compensation.

Setting Count By and Decimal Point (CNtby, SEt dP)

Configures the counting increment and decimal point display.

Filter Configuration (FILTER, OUt.tyP)

Sets filter time constants, filter type, and output signal type.

Setpoint 1 and 2 Configuration (SP.CNF)

Configures setpoint activation modes, relay logic, and LED indicators.

Alarm Configuration (SETPOINTS 3 AND 4, AL.CNF)

Configures alarm activation modes, relay logic, and reset behavior.

Alarm Functions (AL.CNF and AL.MODE)

Sets alarm modes like process, deviation, band deviation, latched, or unlatched.

Alarm Delay (NUM.dLy)

Sets the number of readings required to trigger alarm activation.

Output Configuration and A to D Rate (OUt.CNF, Ad.RAtE)

Enables analog output and sets the analog-to-digital conversion rate.

Input Type and Scale/Offset (INPUt, Rd.SC.OF)

Configures input type (voltage, current, TC, RTD) and enables scale/offset.

Serial Communications Configuration (COMM)

Sets baud rate, parity, stop bits, and Modbus protocol.

Data Format (dAt.FMt)

Configures which data elements (alarms, readings) are included in the output string.

Communications Bus Format (bUS.FMt)

Sets bus protocol (RS-232/RS-485), echo mode, line feed, and checksum.

Lockout Configuration (LCk.CNF)

Locks specific configuration menus to prevent unauthorized changes.

Lockout Configuration and Normal Color (LCk.CNF, N.COLOR)

Locks menus and sets the normal LED display color (Green, Red, Amber).

Color Configuration (COLOR)

Configures LED display colors for setpoints and alarms.

Block A Data Commands

Defines commands for reading/writing Block A data items, including offsets and scales.

Block B Data Commands

Defines commands for reading/writing Block B data items like serial delay, comms config.

Block C Data Commands

Defines commands for reading/writing Block C data items like serial count, alarm delay, color config.

Block D Data Commands

Defines commands for reading/writing Block D data items, factory reserved.

Block E Data Commands (R/W44)

Defines commands for Block E (500mV, 5V, 50V, 1V scale/offset).

Block F Data Commands (R/W45)

Defines commands for Block F (Cal. Quasi Offset).

R46 Command

Command for A/D channel one.

R47 Command

Command for A/D channel two.

R48 Command

Command for A/D channel three.

R/W50 Command (MENU1, MENU2)

Configures menu selection and default values for NUM.PNt.

R/W51-R/W5A Commands (Multi-Point Scale/Offset)

Commands for reading/writing multi-point scale and offset values for pointers 0-9.

Set Sign and Decimal Point Format

Configures sign and decimal point for setpoint values.

RS-485 Meter Address Configuration (AddRES)

Changes the RS-485 device address and applies it via reset.

Readings Between Transmissions (SER CNt)

Sets the number of readings before initiating a transmission in continuous mode.

Recognition Character Configuration (SER.RCG)

Allows changing the security code for commands.

Units of Measure Configuration (SER.UOM)

Sets transmitted values' units of measure for display or printing.

TX/RX Turnaround Delay (SER.dLy)

Configures the delay between transmit and receive for half-duplex systems.

Reading, Input, Output Scale Factor (RdG SC, INP SC, OUT SC)

Configures scale factors for readings, inputs, and outputs.

Reading, Input, Output Offset (RdG OF, INP OF, OUt OF)

Configures offsets for readings, inputs, and outputs.

Setpoint 1 and 2 Hysteresis (SP db)

Sets hysteresis values for setpoints 1 and 2.

Alarm Hysteresis (SP 3 and SP 4, AL db)

Sets hysteresis values for alarms 3 and 4.

Modbus Communication Option Supplement

Modbus Protocol Introduction

Explains the purpose and structure of the Modbus protocol for meter communication.

RTU Mode Description

Describes the RTU transmission mode, its advantages, and byte format.

Modbus Message Frame Structure

Outlines the structure of Modbus messages including address, function code, data, and CRC.

Modbus Function Codes

Lists supported Modbus function codes (Read, Write, Diagnostic) for the meter.

Modbus Data Field

Explains the construction of the data field within Modbus messages.

CRC Checking in Modbus

Details the Cyclic Redundancy Check calculation for error detection.

Modbus RTU Registers

Lists Modbus registers supported by the meter for functions like setpoints, readings, and configuration.

Command Format

Read Multiple Register Command (03 or 04)

Details the format for reading multiple registers from the meter.

Write to Single Register Command (06)

Details the format for writing a single parameter to a register.

Diagnostic Command

Describes the diagnostic command for verifying communication link integrity.

Warranty and Disclaimer

Return Requests and Inquiries

Provides instructions for obtaining an Authorized Return (AR) number for warranty service.

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