Omega i-SERIES User Manual

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5.7.14 % Low and % Hi (Command Indexes 27 and 28)
Make sure the values of % Low and % Hi submenus are entered correctly
(% Hi can’t be more than 99% or % Hi should be always more than % Low). If
values entered incorrectly, instrument will reset these values to factory defaults
(% Low = 0, % Hi = 99 (63 Hex)
5.7.15 Reading Scale and Offset (Command Indexes 14 and 3A)
Description: RDGOFF.23~16, 15~8, 7~0 means 3 bytes x 8 bit positions of the
Reading Offset
RDGSC.23~16, 15~8, 7~0 means 3 bytes x 8 bit positions of the
Reading Scale
RDGOFF.23 = RDGOFF.22~20 = RDGOFF.19~0 =
0 positive offset DP+2 offset data
1 negative offset
RDGSC.23~20 = RDGSC.19 = RDGSC.18~0 =
DP+1 0 direct scale scale data
1 reverse scale
Example: To have an input of 4 to 20 mA displayed as 0 to 100
First make sure that Decimal Point on your device is set to the proper position.
Then, disregard the decimal point position through Scale and Offset calculation.
For instance: to display 0 to 100 set decimal point into position 1 (FFFF);
to display 0 to 100.0 set decimal point into position 2 (FFF.F)
then, perform Scale and Offset calculation to display 0 to 1000.
The Low input value = min. input value * conversion number = 4(mA) x 500 = 2000
The High input value = max. input value * conversion number = 20(mA) x 500 = 10000 (9999)
where: conversion number is a coefficient of conversion between input values and real
display range.
The full range of the display = 10000, conversion number = 10000/20 = 500
See Table 5.9 below for proper conversion number
Table 5.9 Conversion Number
INPUT RANGE CONVERSION NUMBER
0 ~ 100 mV 10000 / (100 x 1) = 100 cts/mV
0 ~ 1 V 10000 / (1000 x 1) = 10 cts/mV
0 ~ 10 V 10000 / (1000 x 10) = 1 cts/mV
0 ~ 20 mA 10000 / (20 x 1) = 500 cts/mA

Omega i-SERIES Specifications

General

Category	Controller
Manufacturer	Omega
Series	i-SERIES
Communication Interface	RS-232, RS-485, Ethernet
Operating Temperature	0 to 50°C (32 to 122°F)

Summary

PART 3 HARDWARE

3.1 Communication Interfaces

Describes RS-232 and RS-485 communication interfaces.

3.2 Wiring RS-232 Interface

Details the wiring for the RS-232 interface.

3.3 Wiring RS-485 Interface

Explains the wiring for the RS-485 interface.

PART 4 COMMUNICATION SETUP

4.1 Flow Chart

Visualizes the communication setup options and parameters.

4.2 Setup the i-Series Device Through the Front Panel

Guide to configuring the device using its front panel buttons.

4.3 Abbreviations, Range, Default Setup

Explains abbreviations, ranges, and default settings for communication.

Abbreviations, Range, Default Setup Continued

Continues the explanation of communication parameters and their settings.

Communications Parameters Submenu

Allows adjustment of serial communication settings for device compatibility.

Bus Format Submenu

Determines communication standards and data formats for the serial bus.

PART 5 i-SERIES PROTOCOL

5.1 Command Structure

Explains the structure of commands for reading and writing data.

5.2 Command Formats

Details the command formats for various i-Series devices and modes.

5.3 Response Format

Shows response formats with and without ECHO mode.

5.4 Error Message

Lists possible error messages and their codes transmitted to the host computer.

5.7 Command Formats

Details command formats, assuming asterisk recognition character and RS-232 communication.

5.7.1 Input Type (Command Index 07)

Explains the format for setting the input type for different instruments.

5.7.2 Reading Configuration: (Command Index 08)

Details the format for configuring reading parameters like decimal points and filters.

5.7.10 Communication Parameters (Command Index 10)

Explains parameters for setting baud rate, parity, data bits, and stop bits.

5.7.11 Bus Format (Command Index 1F)

Configures bus format, including separator, mode, standard, and echo settings.

5.7.12 Data Format (Command Index 20)

Configures data format for commands like V01 or continuous mode.

5.7.15 Reading Scale and Offset (Command Indexes 14 and 3A)

Explains how to set reading scale and offset for accurate data display.

Scaling

Illustrates the Y=mx+b formula for scaling and provides calculation examples.

Calculate Scale

Details the process of calculating and encoding scale factors.

Calculate Offset

Details the process of calculating and encoding offset factors.

PART 6 MODBUS PROTOCOL

6.7 Modbus RTU Registers

Lists the Modbus registers supported by i-Series devices and their ranges.

6.8 Command Format

Outlines the formats for sending and receiving Modbus commands.

6.8.1 Read Multiple Register (03 or 04)

Details the command format for reading multiple registers.

6.8.2 Write to Single Register (06)

Explains the command format for writing a parameter to a single register.

APPENDIX A

Reading Scale and Offset for Process/Strain Gage Instrument

Details setting reading scale and offset for specific instruments with linearization.