Omega ILD BIG DISPLAY User guide

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User’s Guide

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ILD BIG DISPLAY

Monitor / Controller

Communication Manual

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omega.com [email protected]

Servicing North America:

U.S.A. Omega Engineering, Inc. Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only) Engineering Service: 1-800-872-9436 (USA & Canada only) Tel: (203) 359-1660 Fax: (203) 359-7700 e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.

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TABLE OF CONTENTS

Part 1: Before You Begin ....................................................................................2

Part 2: Introduction to Digital Communication.................................................3

2.1 Overview.......................................................................................3

2.2 Definition of Terms ......................................................................3

Part 3: Hardware ...........................................................................................5

3.1 Communication Interfaces..........................................................5

3.2 Wiring RS-232 Interface .............................................................5

3.3 Wiring RS-485 Interface .............................................................6

Part 4: Communication Setup ............................................................................9

4.1 Flow Chart ....................................................................................9

4.2 Setup the i-Series Device Through the Front Panel ...............10

4.3 Abbreviations, Range, Default Setup.......................................10

Part 5: i-Series Protocol....................................................................................13

5.1 Command Structure ..................................................................13

5.2 Command Formats ....................................................................14

5.3 Response Format ......................................................................19

5.4 Error Message............................................................................20

5.5 Alarm Status Characters...........................................................20

5.6 Examples of Transmitted Data .................................................21

5.7 Command Formats ....................................................................22

5.7.1 Input Type (Command Index 07)...................................22

5.7.1.1 Input Type for Temperature/Process ...............22

5.7.1.2 Input Type for Process/Strain Gauge ..............23

5.7.2 Reading Configuration (Command Index 08)..............23

5.7.2.1 Reading Configuration for

Temperature/Process........................................23

5.7.2.2 Reading Configuration for

Process/Strain Gauge .......................................24

5.7.3 Linearization Points (Command Index 29) ..................24

5.7.4 Color Display (Command Index 11)..............................25

5.7.5 Alarm 1 Configuration (Command Index 09)...............25

5.7.6 Alarm 1 Low (Command Index 12) ...............................26

5.7.7 Alarm 2 Configuration (Command Index 0A) ..............26

5.7.8 Output 1 Configuration (Command Index 0C).............27

5.7.9 Output 2 Configuration (Command Index 0D).............27

5.7.10 Communication Parameters (Command Index 10) .....28

5.7.11 Bus Format (Command Index 1F) ................................28

5.7.12 Data Format (Command Index 20)................................29

5.7.13 Miscellaneous (Command Index 24) ............................29

5.7.14 % Low and % Hi (Command Index 27 and 28).............30

5.7.15 Reading Scale and Offset

(Command Index 14 and 3A).........................................30

5.7.16 Grouping Commands with the Same Formats ............33

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Part 6: Modbus Protocol...................................................................................34

6.1 Introduction................................................................................34

6.2 RTU Mode ...................................................................................34

6.3 Device Address..........................................................................35

6.4 Function Code............................................................................35

6.5 Data Field....................................................................................35

6.6 CRC Checking............................................................................36

6.7 Modbus RTU Registers .............................................................37

6.8 Command Format ......................................................................38

6.8.1 Read Multiple Register (03 or 04) .................................38

6.8.2 Write to Single Register (06) ........................................39

6.8.3 Diagnostic Command ....................................................41

6.8.4 Error Response ..............................................................41

Appendix A Reading Scale and Offset .........................................................43

Appendix B ASCII Chart.................................................................................48

ASCII Control Codes .................................................................49

Appendix C Examples of CRC Calculation ..................................................50

Example of CRC Calculation in “C” Language...............................................53

LIST OF FIGURES:

Figure 2.1 Transmission of “c” ....................................................................4

Figure 3.1 DB9 and RS-232 Wiring ..............................................................6

Figure 3.2 DB25 and RS-232 Wiring.............................................................6

Figure 3.3 Multipoint, Half-Duplex RS-485 Wiring .....................................7

Figure 4.1 Flow Chart for Communication Option......................................9

LIST OF TABLES:

Table 3.1 Communication Interface ...........................................................5

Table 3.2 Wiring RS-232 Interface ..............................................................6

Table 3.3 RS-485 Half Duplex Hook-up......................................................8

Table 4.1 Abbreviations, Range, Default Setup ......................................10

Table 5.1 Command Prefix Letters...........................................................13

Table 5.2 Command Formats....................................................................14

Table 5.3 Command Letters and Suffix ...................................................14

Table 5.4 Command Letters and Suffix ...................................................16

Table 5.5 Echo Mode .................................................................................19

Table 5.6 No Echo Mode ...........................................................................19

Table 5.7 Error Message ...........................................................................20

Table 5.8 Alarm Status Characters ..........................................................20

Table 5.9 Conversion Number ..................................................................30

Table 5.10 Commands with Numeric Data Format ...................................33

Table 6.1 Function Code ...........................................................................35

Table 6.2 Modbus Registers .....................................................................37

Table A.1 Conversion Number ..................................................................43

Table A.2 Input Resolution Multiplier .......................................................43

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NOTES, WARNINGS and CAUTIONS

Information that is especially important to note is identified by following labels:

• NOTE

• WARNING or CAUTION

• IMPORTANT

• TIP

NOTE: Provides you with information that is important to successfully

setup and use the Programmable Digital Meter.

CAUTION or WARNING: Tells you about the risk of electrical shock.

CAUTION, WARNING or IMPORTANT: Tells you of circumstances or

practices that can effect the instrument’s functionality and must refer to accompanying documents.

TIP: Provides you helpful hints.

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PART 1

BEFORE YOU BEGIN

Customer Service

If you need assistance, please call the nearest Customer Service Department, listed in this manual.

Manuals, Software

The latest Operation and Communication Manual as well as free configuration software and ActiveX controls are available from the website listed in this manual or on the

CD-ROM enclosed with your shipment.

Communication Menu

The Communication menu only appears with devices purchased with the RS-232C / RS-485 Serial Communications Option. Purchasing the controller with Serial Communications permits a controller to be connected directly to the PC’s available COM port. Device can be configured or monitored from an IBM PC compatible computer using software available on our CD or on our website.

To Disable Outputs

Standby Mode is useful during setup of the controller or when maintenance of the system is necessary. When the controller is in standby, it remains in the ready condition but all outputs are disabled. This allows the system to remain powered and ready to go.

1. When the controller is in “RUN” Mode, push d twice to disable all outputs and

alarms. It is now in “STANDBY” Mode.

2. Push d once more to resume “RUN” Mode.

PUSH d TWICE to disable the system during an EMERGENCY.

To Reset the Meter

1. When the controller is in the “MENU” Mode, push c down button once to direct

controller one step backward of the top menu item.

2. Push c twice to reset controller, prior to resuming “Run” Mode except after

“Setpoints” and “Alarms” that will go to the “Run” Mode without resetting the controller.

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PART 2

INTRODUCTION TO DIGITAL COMMUNICATION

2.1 Overview

This manual describes how to use a digital communication link and i-SERIES or MODBUS communication protocols to operate the iLD Big Display controllers. It has been assumed that the user has some experience with communication protocols and some familiarity with iLD Big Display controllers.

2.2 Definitions of terms

This guide is intended to help the user to become familiar with digital communication between a computer (or other controlling instrument) and one or more devices. User of this manual should be familiar with following definitions:

• Serial Communication is the exchange of the data one bit at a time on a single data line. Serial compares with parallel communication, which sends several bits of information simultaneously over multiple lines or channels.

• Interface are connections over which computers communicate. They may use one pair of wires to send information in one direction and another pair to send in the opposite direction (full duplex). They may also use one pair to send the information in both directions (half duplex).

• Bit is a unit of digital data (binary digit) either a “1” or “0”.

• Byte is a string of seven or eight bits, which represents a single character.

• ASCII (American Standard Code for Information Interchange) – is a 7-bit code defines

128 characters, which include digits, upper and lowercase letters, punctuation symbols, and control codes such as backspace, line feed, carriage return and so on. The ASCII code can be written in a base – 16 number system, called hexadecimal (“hex”). The first 10 digits of this system are represented by the numbers 0 through 9, and the other six digits are represented by the letters A through F. The 128 ASCII character code with the decimal, hexadecimal and binary equivalents is listed in Appendix B.

• Synchronous and Asynchronous Communications

There are two basic types of serial communications, synchronous and asynchronous. With synchronous communications, the two devices initially synchronize themselves to each other, and then continually send characters to stay in sync. Asynchronous means “no synchronization”, and thus does not require sending and receiving idle characters. However, the beginning and end of each byte of data must be identified by start and stop bits. The serial ports on IBM-style PCs are asynchronous devices and therefore only support asynchronous serial communications.

• Start and Stop Bits

The start and stop bits identify the beginning and end of each character and permit a receiver to resynchronize a local clock to each new character. The start bit indicates when the data byte is about to begin and the stop bit signals when it ends. The start bit is always a 0. The stop bit is always a 1.

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• Parity Bit

Besides the synchronization provided by the use of start and stop bits, an additional bit called a parity bit may optionally be transmitted along with the data. A parity bit affords a small amount of error checking, to help detect data corruption that might occur during transmission. You can choose either even parity, odd parity or no parity at all. When even or odd parity is being used, the number of marks (logical 1 bits) in each data byte are counted, and a single bit is transmitted following the data bits to indicate whether the number of 1 bits just sent is even or odd.

For example, when even parity is chosen, the parity bit is transmitted with a value of 0 if the number of preceding marks (1’s) is an even number. For the binary value of 0110 0011 the even parity bit would be 0. If even parity were in effect when the binary number 1101 0110 is sent, then the parity bit would be 1. Odd parity is just the opposite, and the parity bit is 0 when the number of mark bits (1’s) in the preceding word is an odd number. Parity error checking is very rudimentary. While it will tell you if there is a single bit error in the character, it doesn't show which bit was received in error. Also, if an even number of bits are in error then the parity bit would not reflect any error at all. No parity ignores the parity bit. When transmitted, each character is preceded by a start bit and followed by a stop bit plus an optional parity bit, making train of 10 or 11 bits for each transmitted character. The Figure 2.1 below shows transmission of the 7 bits of the ASCII lower case “c” with start, stop and even parity bits.

• Baud Rate

The baud rate refers to the data transmission. It specifies the communication rate over the bus. When a change in signal represents one data bit, baud rate is equal to bits per second (bps). Standard baud rates for computers are 300, 600, 1200,2400, 4800, 9600 and 19200 baud.

Figure 2.1 Transmission of “c” with start, stop, and even parity bits.

• Communication Protocol

A data communication protocol defines the rules and structure of messages used by all devices on a network for data exchange. This protocol also defines the orderly exchange of messages, and the detection of errors. iLD Big Display controllers use i-SERIES and MODBUS communication protocols.

7 - BIT CHARACTER

12345678

START BIT EVEN PARITY BIT

STOP BIT

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PART 3

HARDWARE

3.1 Communication Interfaces

Two communication interfaces are supported in the iLD Big Display devices: RS-232 and RS-485. These standards define the electrical characteristics of a communication network.

• The RS-232 standard (point-to-point) allows a single device to be connected to a PC. The iLD Big Display devices operate with full-duplex RS-232 using three wires: a Rx receive wire, a Tx - transmit wire and a common ground wire. RS-232 cable length is limited to 50 feet.

• The RS-485 standard (multipoint) allows one or more devices to be connected (multi-dropped) using a two wire connection (half-duplex) +Rx / +Tx and -Rx / -Tx. Use of RS-485 communications allows up to 32 “remote” devices to connect to the “master” computer with cable length up to 4000 feet long.

• Both interfaces use standard RS-232/RS-485 voltage levels.

Although the RS-485 is commonly referred to as a “two wire” connection, the iLD Big Display also provides a ground / return shield connection to use as a common connection for EMI noise protection.

The Table 3.1 shows the differences between RS-232 and RS-485 communication interfaces.

Table 3.1 Communication Interfaces

Data Transmission Characteristics RS232 RS485 Transmission Mode Single ended Differential Electrical connections 3 wire 2 wire Drivers per line 1 driver 32 drivers Receivers per line 1 receiver 32 receiver Maximum data rate 20k bits/s 10M bits/s Maximum cable length 50 ft (15 meters) 4000 ft (1200 meters)

Changing between RS-232 and RS-485 is possible through the front panel buttons (see Part 4 for details).

3.2 Wiring RS-232 Interface

Most PC’s provide an RS-232 port for digital communication. The RS-232 communication uses three wire full-duplex system: a line for receiving data, a line for transmitting data and a common line between the computer and device. Usually PCs use a 25 or 9 pin connector.

Caution: Do not connect power to your instrument until you have completed all serial interface connections. Failure to do so may result in injury.

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Figures 3.1 and 3.2 show the three-wire RS-232 connections between the host computer using a 9-pin or 25-pin “D” connector and the iLD Big Display device.

Figure 3.1 Wiring between DB9 computer connector and RS-232 controller interface

Figure 3.2 Wiring between DB25 computer connector

and RS-232 controller interface

Table 3.2 shows the pin connection assignments between the RS-232 connector on the meter and the 9-pin or 25-pin “D” connectors of your computer.

Table 3.2 Wiring RS-232 Interface

COMPUTER iLD Big Display

FUNCTION/LABEL PIN FUNCTION DB9 DB25 TB4 Receive (Rx) 2 3 Transmit (Tx) 3 Transmit (Tx) 3 2 Receive (Rx) 2 Common ground 5 7 RTN 1

3.3 Wiring RS-485 Interface

RS-485 interface uses a two wire communication system (one for transmitting and one for receiving) plus a common wire to connect to the shield of a cable. It is recommended to use a shielded cable with one twisted pair.

Use of twisted pair and shield will significantly improve noise immunity.

789

2345

20 21 21 23 24 25

15 16 17 18

2 3 4 5

7 8 9 10 11 12 13

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Figure 3.3 shows multipoint, half-duplex RS-485 interface connections for the iLD Big Display.

Figure 3.3 Multipoint, Half-Duplex RS-485 wiring

Value of the termination resistor is not critical and depends on the cable impedance.

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Table 3.3 shows RS-485 half-duplex hookup using a computer’s RS-232 interface, an RS-485 interface converter, and an iLD Big Display controller.

Table 3.3 RS-485 Half-Duplex Hook-up

COMPUTER CONVERTER BOX iLD Big Display

FUNCTION/LABEL

PIN FUNCTION DB9 DB25 COMPUTER iLD TB4

SIDE SIDE Rx/Tx 2 3 SEE CONVERTER’S -Rx/-Tx Tx 3 Rx/Tx 3 2 MANUFACTURING +Rx/+Tx Rx 2

Common ground 5 7 SPECIFICATION COM RTN 1

Communication Interfaces shown above are those which are used on iLD Big Display devices. Other types of Communication Interfaces are not covered in this chapter.

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PART 4

COMMUNICATION SETUP

4.1 Flow Chart

Figure 4.1 Flow Chart for Communication Option

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4.2 Setup the iLD Big Display Device Through the Front Panel You can setup your device by pressing the push buttons on the front panel.

ENTER COMMUNICATION OPTION MENU:

Press a 1) Press a until

CNFG

prompt appears.

Press d 2) Display advances to

INPT

Input Menu.

Press a 3) Press a, until display advances to

COMM

Communication Options Menu.

Press d 4) Display advances to

C.PAR

Communication Parameters Submenu.

a - Use a to advance/navigate through all Communication Menu items. b - Press d to access the submenus from a top level of Communication Menu item.

Press d to store a submenu selection.

- Press bto scroll through “flashing” selection. When a numerical value is displayed, press bto change a value of this parameter.

d - Press c to go back to a top level of Communication Menu item. Press c twice to

reset the device to Run mode.

4.3 Abbreviations, Range, Default Setup

The Communication Menu Displays items using some abbreviations and compact wording shown on Table 4.1.

Table 4.1 Abbreviations, Range, Default Setup

Display Function Range/ Definition Factory

(abbreviations) Default

C.PAR Communication

Parameter:

bAUd Baud rate 300, 600,1200, 2400

4800, 9600, 19200 9600

PRtY (odd_, EVEN, Parity Odd, Even, No odd _No_) dAtA (7.bit, 8.bit) Data bit 7 bit, 8 bit 7.bit StOP (1.bit, 2.bit) Stop bit 1 bit, 2 bit 1.bit bus.F Bus format: M.bUS Modbus protocol Yes – Modbus protocol enabled

No – i-Series protocol enabled _No_

_LF_ Line feed Yes – print on every other line

No – print on every line _No_

ECHO Echo Yes – echo the command _YES

parameter No – no echo

StNd (232C, 485_) Communication RS-232, RS-485 232C

Standard

ModE (CMd_, CoNt) Data Flow Mode Command – operate in Command CMd_

Mode (respond to valid command). Continuous – operate in Continuous mode (transmit different measurement values continuously on the bus).

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Abbreviations, Range, Default Setup Continued

SEPR (SPCE, _cR_) Data Separation Space – space inserted after each SPCE

Character piece of data.

Carriage Return – carriage return inserted after each piece of data

dAt.F Data Format: stAt Alarm Status Yes – enables the transmission of _No_

Alarms Value No – disable

RdNG Reading Yes – enables the transmission _Yes

of Reading Value No – disable

PEAk Peak Yes – enables the transmission _No_

of Peak Value No – disable

VALY * Valley Yes – enables the transmission _No_

of Valley Value No – disable

GROS ** Gross Yes – enables the transmission _No_

of Gross Value No – disable

UNit Units Yes – enables the transmission _No_

of Units of Measurement No – disable

AddR Multipoint Address 0000 to 0199 – Addressed Meter 0001 tR.tM Transmit Time 0000 to 5999 sec – transmission 0016

Interval Time Interval between consecutive

transmissions in Continuous Mode. Recognition 20 Hex to 7F Hex (32 to 127 Dec) * Character –see Table 2.1, except “^”, “A”,

“E”

* - For Temperature/Process instrument only ** - For Process/Strain Gauge instrument only

1. There is no Continuous Mode, when the device is configured to use the RS-485 interface standard.

2. The Multipoint Address will be included in the transmission data if RS-485 standard has been selected in the menu items.

3. Transmit time is available only when the device has been configured for Continuous Mode and RS-232 Standard.

4. If the meter is in point-to-point Continuous Mode, it ignores any transmitted commands except Crtl S, which will stop transmission.

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Communications Parameters Submenu

Allows the user to adjust Serial Communications settings of the device. When connecting an instrument to a computer or other device, the Communication Parameters must match. Generally the default settings shown in Table 4.1 should be utilized.

Bus Format Submenu

Determines communications standards and command/data formats for transferring information into and out of the device via the Serial Communications Bus. Bus Format submenus essentially determine how and when data can be accessed via the Serial Communications Port of the device.

Data Format Submenu

Preformatted data can be sent automatically or upon request from the device. Use the Data Format Submenus to determine what data will be sent in this preformatted data string. At least one of the Data Format suboptions must be enabled to send output data to the Serial Bus.

Recognition Character

A selectable symbol transmitted as the first character of each message from the computer, which is used for message security: the meter ignores messages without this symbol.

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PART 5

i-SERIES PROTOCOL

To Enable the i-Series Protocol, set the Modbus menu item to “No” in the Bus Format Submenu of the Communication Menu. Refer to Section 5.7.11.

A Data Communication Protocol defines the rules and structure of messages used by all devices on a network for data exchange. A typical transaction will consist of a request to send from the “master” followed by the response from the “slave”.

5.1 Command Structure

The device can be commanded to “Read”, i.e., to transmit (send) data from either the nonvolatile memory (EEPROM) or from the volatile working memory (RAM).

The device can also be commanded to “Write”, i.e., store new values for data processing or control.

There are different command types associated in communicating with your meter shown in Table 5.1, which shows the Command Prefix Letters (Command Classes).

Table 5.1 Command Prefix Letters

COMMAND PREFIX (COMMAND CLASS)

MEANING

^AE Special read, Communication parameters P (Put) Write HEX data into RAM W (Write) Write HEX data into EEPROM. 1,000,000 writes to EEPROM

is guaranteed!

G (Get) Read HEX data from RAM

R (Read) Read HEX data from EEPROM U Read status byte V Read measurement data string in Decimal format X Read measurement data values in Decimal format D Disable E Enable Z Reset

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5.2 Command Formats

Table 5.2 shows the command formats for iLD Big Display devices.

Table 5.2 Command Formats

For “P” and “W” Command For “G” and “R” Command For “X”, “V”, “U”, “D”, classes: classes: “E”, and”Z” Command

classes:

Point-to-point mode Point-to-point mode Point-to-point mode

* ccc<data><cr> * ccc <cr> * ccc <cr>

Multipoint mode Multipoint mode Multipoint mode

* nnccc [<data>]<cr> * nnccc <cr> * nnccc <cr>

Where: “*” is the selected Recognition Character. You may select any ASCII table symbol from

“!” (HEX address “21”) to the right-hand brace (HEX “7D”) except for the caret “^”, “A”, “E”, which are reserved for bus format request.

“ccc” stands for the hex-ASCII Command Class letter (one of eleven given in Table 5.1), followed by the two hex-ASCII Command Suffix characters identifying the meter data, features or menu items to which the command is directed (given in Table 5.3).

“<data>” is the string of characters containing the variable information the computer is sending to the meter. These data (whether BCD or binary) are encoded into hex-ASCII characters, two characters to the byte. Square brackets (indicating optional status) enclose this string, since some commands contain no data.

“<nn>” are the two ASCII characters for the device Bus Address of RS-485 communication . Use values from “00” to hex “C7” (199 decimal).

Table 5.3 and 5.4 shows the command letters and suffix for iLD Big Display devices.

Table 5.3 Command Letters and Suffix for Temperature/Process and Process/Strain Gauge Instruments

Command Command Function Command # Of Default

Index Bytes Characters Value

RW 01 SP1 3 6 200000 RW 02 SP2 3 6 200000

GPRW 03 RDGOFF 3 6 200000

RW 04 ANLOFF 3 6 400000 RW 05 ID 2 4 0003

-06 N/A - --

RW 07 INPUT 1 2 04

GPRW 08 RDGCNF 1 2 4A

RW 09 AL1CNFG 1 2 00 RW 0A AL2CNFG 1 2 00 RW 0B LOOP BREAK TIME 2 4 003B RW 0C OUT1CNF 1 2 00 RW 0D OUT2CNF 1 2 60 RW 0E RAMPTIME 2 4 0000

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Command Letters and Suffixes Continued

Command Command Function Command # Of Default

Index Bytes Characters Value

RW 0F ANLSCL 3 6 9186A0 RW 10 COMM.PARAMETERS 1 2 0D RW 11 COLOR 1 2 09 RW 12 AL1LO 3 6 A003E8 RW 13 AL1HI 3 6 200FA0

GPRW 14 RDGSCL 3 6 100001

RW 15 AL2LO 3 6 A003E8

RW 16 AL2HI 3 6 200FA0 GPRW 17 PB1/DEAD BAND 2 4 00C8 GPRW 18 RESET 1 2 4 00B4 GPRW 19 RATE 1 2 4 0000 GPRW 1A CYCLE 1 1 2 07

-1B N/A - - - GPRW 1C PB2/DEAD BAND 2 4 00C8 GPRW 1D CYCLE 2 1 2 07

RW 1E SOAK TIME 2 4 0000 RW 1F BUS FORMAT 1 2 14

GPRW 20 DATA FORMAT 1 2 02

RW 21 ADDRESS 1 2 01 RW 22 Transit Time Interval 2 4 0010

-23 N/A - --

RW 24 Miscellaneous 1 2 00 RW 25 C.J. OFFSET ADJ. 3 6 200000 RW 26 Recognition Character 1 2 2A RW 27 %LOW 1 2 00 RW 28 %HI 1 2 63

D 01 DISABLE ALARM 1 0 0 D 02 DISABLE ALARM 2 0 0 D 03 STANDBY 0 0 D 04 DISABLE SELF 0 0 E 01 ENABLE ALARM 1 0 0 E 02 ENABLE ALARM 1 0 0 E 03 DISABLE STANDBY 0 0 E 04 ENABLE SELF 0 0 X 01 SEND READING 0 0 X 02 SEND PEAK READING 0 0 X 03 SEND VALLEY READING 0 0 U 01 SEND ALARM STATUS 0 0 U 03 SEND SW VERSION 0 0 V 01 SEND DATA STRING 0 0 Z 02 HARD RESET 0 0 -

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Table 5.4 Command Letters and Suffix for Process/Strain Gauge Instrument with 10 Linearization Points

Command Command Function Command # Of Default

Index Bytes Characters Value

RW 01 SP1 3 6 200000 RW 02 SP2 3 6 200000

GPRW 03 RDGOFF 3 6 200000

RW 04 ANLOFF 3 6 400000 RW 05 ID 2 4 0003

-06 N/A - --

RW 07 INPUT 1 2 04

GPRW 08 RDGCNF 1 2 4A

RW 09 AL1CNFG 1 2 00 RW 0A AL2CNFG 1 2 00 RW 0B LOOP BREAK TIME 2 4 003B RW 0C OUT1CNF 1 2 00 RW 0D OUT2CNF 1 2 60 RW 0E RAMPTIME 2 4 0000 RW 0F ANLSCL 3 6 9186A0 RW 10 COMM.PARAMETERS 1 2 0D RW 11 COLOR 1 2 09 RW 12 AL1LO 3 6 A003E8 RW 13 AL1HI 3 6 200FA0

GPRW 14 RDGSCL 3 6 100001

RW 15 AL2LO 3 6 A003E8

RW 16 AL2HI 3 6 200FA0 GPRW 17 PB1/DEAD BAND 2 4 00C8 GPRW 18 RESET 1 2 4 00B4 GPRW 19 RATE 1 2 4 0000 GPRW 1A CYCLE 1 1 2 07

-1B N/A - - - GPRW 1C PB2/DEAD BAND 2 4 00C8 GPRW 1D CYCLE 2 1 2 07

RW 1E SOAK TIME 2 4 0000 RW 1F BUS FORMAT 1 2 14

GPRW 20 DATA FORMAT 1 2 02

RW 21 ADDRESS 1 2 01 RW 22 Transit Time Interval 2 4 0010

-23 N/A - - -

RW 24 Miscellaneous 1 2 00 RW 25 C.J. OFFSET ADJ. 3 6 200000 RW 26 Recognition Character 1 2 2A RW 27 %LOW 1 2 00 RW 28 %HI 1 2 63

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Command Letters and Suffixes Continued

Command Command Function Command # Of Default

Index Bytes Characters Value

RW 2B INPUT FOR SCALE 1 3 6 RW 2C INPUT FOR SCALE 2 3 6 RW 2D INPUT FOR SCALE 3 3 6 RW 2E INPUT FOR SCALE 4 3 6 RW 2F INPUT FOR SCALE 5 3 6 RW 29 Linearization Points 1 2 00 RW 30 INPUT FOR SCALE 6 3 6 RW 31 INPUT FOR SCALE 7 3 6 RW 32 INPUT FOR SCALE 8 3 6 RW 33 INPUT FOR SCALE 9 3 6 RW 34 RDGSCL1/SCALE 1 3 6 RW 35 RDGSCL2/SCALE 2 3 6 RW 36 RDGSCL3/SCALE 3 3 6 RW 37 RDGSCL4/SCALE 4 3 6 RW 38 RDGSCL5/SCALE 5 3 6 RW 39 RDGSCL6/SCALE 6 3 6 RW 3A RDGSCL7/SCALE 7 3 6 RW 3B RDGSCL8/SCALE 8 3 6 RW 3C RDGSCL9/SCALE 9 3 6 RW 3D RDGOFF1/OFFSET 1 3 6 RW 3E RDGOFF2/OFFSET 2 3 6 RW 3F RDGOFF3/OFFSET 3 3 6 RW 40 RDGOFF4/OFFSET 4 3 6 RW 41 RDGOFF5/OFFSET 5 3 6 RW 42 RDGOFF6/OFFSET 6 3 6 RW 43 RDGOFF7/OFFSET 7 3 6 RW 44 RDGOFF8/OFFSET 8 3 6 RW 45 RDGOFF9/OFFSET 9 3 6 -

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After modifying any settings with the use of the W prefix commands, a Hard Reset command should be sent in order to load the changes into Volatile memory.

Examples:

1. To reset the controller, send *Z02 (Table 5.3 & 5.4)

2. To read Setpoint 1, send *R01 (Table 5.3 & 5.4)

3. To change Setpoint 1 to 100.0, send *W012003E8 (see explanation below)

Description: SETPOINT.23~0 means 3 bytes x 8 bit positions

(2 hex. character in each byte) Where 23~0 are 3 x 8 = 24 Binary bit positions

SETPOINT.23 = SETPOINT.22~20 = SETPOINT.19~0 = 0 = positive sign 000 – Not Allowed Setpoint data 1 = negative sign 001 – Decimal Point 1 (FFFF.)

010 – Decimal Point 2 (FFF.F) 011 – Decimal Point 3*(FF.FF) 101 – Decimal Point 4*(F.FFF) *Process only

For 100.0: Positive sign = 0, Decimal Point 2 = 010 Bin, Setpoint data 1000 = 3E8 Hex = =00 1111101000 Bin The command data = 0010 0000 0000 0011 1110 1000 Bin = 2003E8 Hex.

2 0 0 3 E 8 Hex

Send *W01 20 03E8 where: *W01 - *<ccc> - write to Setpoint 1 (Table 5.2) 2003E8 - <data> - Setpoint data in hexadecimal format including sign and decimal point (Table 5.2)

No spaces are allowed in the data string. The spaces shown on the above example for illustration purposes only.

Decimal Point position for TC/RTD = 1 or 2, for PROCESS = 1, 2, 3, or 4

Decimal Point position for Set Point should be the same as Decimal Point position set for process value and can not be overwritten by SETPOINT command (see RDGCNG command, described in 5.7.2).

4. To change Setpoint 1 to –100.0, send *W01A003E8 (see explanation below) For (–100.0): Negative sign = 1, Decimal Point 2 = 010 Bin, Setpoint data 1000=3E8 Hex = 001111101000 Bin The command data = 1010 0000 0000 0011 1110 1000 Bin = A003E8 Hex

A 0 0 3 E 8 Hex

Send *W01A003E8

5. To send the same as above for RS-485 with transmit address 01, the command is Send *01W01A003E8.

Page 23

5.3 Response Format

Table 5.5 and 5.6 show response format with ECHO and without ECHO Mode selection.

Table 5.5 Echo Mode

For “P” and “W” For “G” and “R” For “X”,”V” and “U”

For “D”, “E” and “Z” Command Command Command Command classes: classes: classes: classes: Point-to-point Point-to-point Point-to-point Point-to-point mode mode mode mode

ccc<cr> ccc<data> <cr> ccc<value><cr> ccc<cr>

Multipoint mode Multipoint mode Multipoint mode Multipoint mode

nnccc <cr> nnccc<data> <cr> nnccc<value><cr> nnccc<cr>

Examples:

1. Sent: *W012003E8 (Change Setpoint 1 to 100.0- see example above) Response: W01

2. Sent *R01 (Read Setpoint 1, which set to 100.0) Response: R012003E8

3. Sent: *X01 (Controller reads 75.4 F and Units set to “No”) Response: X01075.4

4. Sent: *E02 (Enable Alarm 2) Response: E02

Table 5.6 No ECHO Mode

For “P” and “W” For “G” and “R” For “X”,”V” and “U”

For “D”, “E” and “Z” Command Command Command Command classes: classes: classes: classes: Point-to-point Point-to-point Point-to-point Point-to-point mode mode mode mode

No Response <data> <cr> <value><cr> No Response

Multipoint mode Multipoint mode Multipoint mode Multipoint mode

No Response <data> <cr> <value><cr> No Response

Examples:

1. Sent: *W012003E8 (Change Setpoint 1 to 100.0 - see example above) Response: No Response

2. Sent *R01 (Read Setpoint 1, which set to 100.0) Response 2003E8

3. Sent: *X01 (Controller reads 75.4 F and Units set to “No”) Response: 075.4

4. Sent: *E02 (Enable Alarm 2) Response: No Response

<data> in Hexadecimal format, except “U” command class, <value> reading in Decimal format

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5.4 Error Message

The instrument is capable of detecting different errors during the Communication process and will transmit an indicating message as shown in Table 5.7 to the host computer.

Table 5.7 Error Message

ERROR MESSAGE CODE 1 Command Error ?43 2 Format Error ?46 3 Parity Error ?50 4 Serial Device Address Error ?56

Where:

1. COMMAND ERROR occurs when:

a. Command prefix letter is not valid.

b. Command suffix is not valid.

2. FORMAT ERROR occurs when:

a. Length of message is either shorter or longer than it should be.

b. Any characters other than “0 – F” used for hexadecimal values.

3. PARITY ERROR occurs when transmitted parity does not match with parity set on the receiver.

4. Serial Device Address Error occurs if the new value is larger than 199 decimal.

1. The iLD Big Display device will not respond to a command if the command‘s recognition character does not match the meter’s recognition character.

2. When in Multipoint mode, the device will not respond to the command if the addresses do not match.

3. If the device is in the Menu or Setpoint Mode and receives any transmitted data, it quits that routine, displays

COMM

for up to 2 seconds, completes its

Communication job, and then resets the device, i.e., hard reset.

5.5 Alarm Status Characters

The meter, upon receiving the U01 Command, will transmit the alarm status characters. Table 5.8 shows the transmitted character for each of the possible setpoint/alarm states.

Table 5.8 Alarm Status Characters

CHARACTER Alarm1 Alarm2

@ OFF OFF

A ON OFF B OFF ON CONON

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5.6 Examples of Transmitted Data

1. The following menu items have been selected: Standard – RS-232, Mode – Continuous, Linefeed – No, Separation – Space, Status - No

Echo – No, Reading – Yes, Valley – Yes, Peak – Yes, Unit of measurement – Yes Assume that instrument has the following data: Reading value = 74.2°F, Peak value = 75.1°F, Valley value = 73.2°F Alarm 1 – OFF, Alarm 2 - OFF

Instrument will transmit: 74.2 75.1 73.2 F

2. The following menu items have been changed: Separation – Carriage Return

Instrument will transmit: 74.2

75.1

73.2 F

3. The following menu items have been changed: Alarm Status – Yes

Instrument will transmit: @

74.1

75.1

73.2 F

4. The following menu items have been changed: ECHO – Yes, Alarm 1 - ON

Instrument will transmit: V01

74.2

75.1

73.2 F

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5.7 Command Formats

The following conditions are assumed in the examples in this section.

1. The recognition character is the asterisk (*).

2. The meter uses the RS-232 interface standard (point-to-point communication).

3. When the “W” command is given, a reset is necessary to initiate the command.

4. Each byte consist of 8 bits.

5. “ “ (blank) in bit pattern information means the bit is not applicable to that parameter.

Note that all ranges have been given decimal numbers. To make a data command, the decimal numbers are converted into a hex numbers and then the digits of that hex number are encoded into their equivalent ASCII values.

5.7.1 Input Type (Command Index 07)

Description: INPUT.76543210 means 8 bit positions of the Command Data.

5.7.1.1 Input Type Format for Temperature/Process Instrument

BIT POSITION INPUT CLASS, RANGE

7 6 5 4 3 2 1 0 OR TYPE

0 0 TC (Thermocouple) 01 RTD 1 0 PROCESS

TC/ RTD/ PROCESS 0000 J/ 392.2/ 0-100 mV 0001 K/ 392.3/ 0-1 V 0010 T/ 392.4/ 0-10 V 0011 E/ 385.2/ 0-20 mA 0100 N 0101 DIN-J/ 385.4 0110 R 0111 S 1000 B/ xx/ xx 1001 C/ xx/ xx 1100 xx/ 385.3/ xx

0 0 100 ohm RTD 0 1 500 ohm RTD 1 0 1000 ohm RTD

Example: Set RTD, 4 wire, .0392 Curve, 100 ohms.

The command data is 00001001 Bin = 09HEX. Send: *W0709

Send a Read command first to determine the bits, which are not specified for some positions (TC and Process for positions 7,6 above).

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5.7.1.2 Input Type Format for Process/Strain Gauge Instrument

BIT POSITION INPUT CLASS, RANGE

7654321 0 OR TYPE

0 0 Voltage 0 ~ 100 mV 0 1 Voltage 0 ~ 1 V 1 0 Voltage 0 ~ 10 V

1 1 Voltage 0 ~ 20 mA 0 Ratio Disable 1 Ratio Enable

0 Low Resolution

1 High Resolution 0 Peak Value 1 Gross Value

Example: Set Voltage 0 ~ 100 mV, Ratio Enabled, Low Resolution, Gross Value

The command data is 00010100 Bin = 14HEX. Send: *W0714

Send a Read command first to determine the bits, which are not specified for some positions (positions 7,6 and 5 above).

5.7.2 Reading Configuration: (Command Index 08)

Description: RDGCNG.76543210 means 8 bit positions of the Command Data.

5.7.2.1 Reading Configuration Format for Temperature/Process Instrument

BIT NUMBER FUNCTION

76543210

0 0 0 Not Allowed 0 0 1 Decimal Point 1 (FFFF) 0 1 0 Decimal Point 2 (FFF.F) 0 1 1 Decimal Point 3 (FF.FF)

1 0 0 Decimal Point 4 (F.FFF) 0°C 1°F

0 0 0 Filter Constant 1 0 0 1 Filter Constant 2 0 1 0 Filter Constant 4 0 1 1 Filter Constant 8 1 0 0 Filter Constant 16 1 0 1 Filter Constant 32 1 1 0 Filter Constant 64 1 1 1 Filter Constant 128

Example: Set Decimal point 1, ºC, Filter constant 16.

The command data is 10000001Bin = 81Hex. Send: *W0881

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5.7.2.2 Reading Configuration Format for Process/Strain Gauge Instrument

BIT NUMBER FUNCTION

76543210

0 0 0 Not Allowed

0 0 1 Decimal Point 1 (FFFF)

0 1 0 Decimal Point 2 (FFF.F)

0 1 1 Decimal Point 3 (FF.FF)

1 0 0 Decimal Point 4 (F.FFF) 0 Load (On line Cal) Disable 1 Load Enable

0 0 0 Filter Constant 1 0 0 1 Filter Constant 2 0 1 0 Filter Constant 4 0 1 1 Filter Constant 8 1 0 0 Filter Constant 16 1 0 1 Filter Constant 32 1 1 0 Filter Constant 64 1 1 1 Filter Constant 128

Example: Set Decimal point 2, Load Enable, Filter constant 4.

The command data is 01010010 Bin = 81Hex. Send: *W084A

5.7.3 Linearization Point (Command Index 29)

The data for number of Linearization Points (number of Scales and Offsets) has offset of -2.

Example: Linearization Points 2 (Scale/Offset number 1 is active for the entire range)

Send: *W2900

Example: Linearization Points 10 (All 9 Scale/Offset are active)

Send: *W2908

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5.7.4 Color Display (Command Index 11)

Description: CLR.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

76543210

0 0 Alarm 2 Color AMBER 0 1 Alarm 2 Color GREEN 1 0 Alarm 2 Color RED

0 0 Alarm 1 Color AMBER 0 1 Alarm 1 Color GREEN 1 0 Alarm 1 Color RED

0 0 Normal Color AMBER 0 1 Normal Color GREEN 1 0 Normal Color RED

Example: Set Normal color green, Alarm 1 color red, Alarm 2 color amber

The command data is 00001001Bin = 09Hex. Send *W1109

5.7.5 Alarm 1 Configuration (Command Index 09)

Description: ALR1CNG.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

76543210

0 Alarm 1 at Power On Disable 1 Alarm 1 at Power On Enable

0 Loop Break Time Disable 1 Loop Break Time Enable

0 0 Active Above 0 1 Active Below 1 0 Active Hi/Lo 1 1 Active Band (Deviation only)

0 Normally Open 1 Normally Closed

0 Unlatch

1 Latch

0 Absolute 1 Deviation

0 Disable Alarm 1 /

Retransmission

1 Enable Alarm 1 /

Retransmission

Example:Set Alarm 1 Enable, Deviation, Unlatch, N.C., Band, Loop Disable, Alarm at

Power On Enable. The command data is 10111011Bin = BBHex. Send: *W09BB

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5.7.6 Alarm 1 Low (Command Index 12)

Description: AL1LO.23~0 means 3 bytes x 8 bit positions of the Alarm Low Data

AL1LO.23 = AL1LO.22~20 = AL1LO.19~0 = 0 = positive sign 000 – Not Allowed Setpoint data 1 = negative sign 001 – Decimal Point 1 (FFFF.)

010 – Decimal Point 2 (FFF.F) 011 – Decimal Point 3*(FF.FF) 101 – Decimal Point 4*(F.FFF) *Process only

Example:Set Alarm 1 Low value to -50.0

The command data is 101000000000000111110100Bin = A001F4Hex. Send: *W12A001F4

To set the Decimal Point for proper position see command format for RDGCNF (command index 08).

5.7.7 Alarm 2 Configuration (Command Index 0A)

Description: ALR2CNG.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

76543210

0 Voltage Retransmission 1 Current Retransmission

0 0 Active Above 0 1 Active Below 1 0 Active Hi/Lo 1 1 Active Band (Deviation only)

0 Normally Open 1 Normally Closed

0 Unlatch

1 Latch

0 Absolute 1 Deviation

0 Disable 1 Enable

Example: Set Alarm 2 Enable, Absolute, Latch, N.O.,Above, Current Retransmission.

The command data is 10000101 Bin = 85Hex. Send: *W0A85

Warning: If you change the “0A” to “00” on units with Isolated Analog Output it will disable the Alarm 2 menu.

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5.7.8 Output 1 Configuration (Command Index 0C)

Description: OUT1CNG.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

76543210

0 Auto Tune PID Stop 1 Auto Tune PID Start

0 Anti Wind Up Disable 1 Anti Wind Up Enable

0 Auto PID Disable

1 Auto PID Enable

0 Reverse

1 Direct 0 Analog Proportional 0 – 20 mA 1 Analog proportional 4 – 20 mA

0 Time Proportional On/Off 1 Time Proportional PID

Example: Set PID, Direct, Auto PID Enable, Anti Integral Enable, Auto PID Stop.

The command data is 00010111Bin = 2Fhex. Send: *W0C17

5.7.9 Output 2 Configuration (Command Index 0D)

Description: OUT2CNG.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

765 43210

0 0 0 Damping 0 0 0 1 Damping 1 0 1 0 Damping 2 0 1 1 Damping 3 1 0 0 Damping 4 1 0 1 Damping 5 1 1 0 Damping 6 1 1 1 Damping 7

0 Soak Disable 1 Soak Enable

0 Ramp Disable 1 Ramp Enable

0 Auto PID Disable 1 Auto PID Enable

0 Reverse

1wReverseADirect

0 Time Proportional On/Off 1 Time Proportional PID

Example: Set On/Off, Reverse, Auto PID Disable, Ramp Disable, Soak Disable,

Damping 4. The command data is 10000101Bin = 80Hex. Send: *W0D85

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5.7.10 Communication Parameters (Command Index 10)

Description: COMM.PAR.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

76543210

0 1 Stop Bit 1 2 Stop Bit

0 7 Bit 1 8 Bit

0 0 No Parity 0 1 Odd 1 0 Even

0 0 0 300 Baud 001 600 0 1 0 1200 0 1 1 2400 1 0 0 4800 1 0 1 9600 1 1 0 19200

Example: Set Baud Rate 9600, Odd Parity, 7 Bit, 1 Stop.

The command data is 00001101Bin = 0Dhex. Send: *W100D

5.7.11 Bus Format (Command Index 1F)

Description: BUSFORMAT.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

76543210

0 Space 1 Carriage Return

0 Continuous 1 Command

0 RS-232 1 RS-485

0 N0 ECHO 1 ECHO

0 No Line Feed 1 Line Feed

0 No Modbus 1 Modbus

Example: Set Space, Continuous, RS-232, Echo, Line Feed, N/A

The command data is 00000110Bin = 06Hex. Send *W1F06

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5.7.12 Data Format (Command Index 20)

DATAFORMAT is used for V01 command or continuous mode (RS-232)

Description: DATAFORMAT.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION

76543210

0 No Unit 1 Unit

0 No Valley or Gross 1 Valley or Gross

0 No Peak 1 Peak

0 No Reading 1 Reading

0 No Alarm Status 1 Alarm Status

Example: Set ID, Unit, No Valley, No Peak, Reading, No Status.

The command data is 11000010Bin = C2Hex. Send: *W20C2

ADDRESS is applicable for RS-485 standard only and can be 01 to 199

TRANSMIT TIME INTERVAL is applicable for RS-232 standard and Continuous Mode,

which specifies the time between transmission and the minimum time is 500 msec.

5.7.13 Miscellaneous (Command Index 24)

Description: MISCELLANEOUS.76543210 means 8 bit positions of the Command Data.

BIT NUMBER FUNCTION 76543210 0 SP Deviation Disable 1 SP Deviation Enable

0 Self Disable 1 Self Enable

0 Full ID Disable 1 Full ID Enable

0 Set Point ID Disable 1 Set Point ID Enable

Example: Set SP Enable, Self Disable, Full ID Enable, Set Point ID Disable.

The command data is 10001000Bin = 88Hex. Send: *W2088

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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 the 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

Page 35

Scaling:

To remap 4 – 20 mA to a displayed reading from 0 to 100 then use slope:

Rd2 – Rd1

Slope (Scale) = -------------------

In2 – In1I

where: Rd2 – Hi Display reading (100), Rd1 – Low Display reading (0)

In2 – Hi Input (20 x 500), In1 – Low Input (4 x 500)

1. Obtain a Scale Factor

Scale = (100-0) / (9999-2000) = 0.0125016

2. Rewrite the Scale Factor as an integer times an exponent

0.0125016 = 125016 E -7

3. Then Encode these values

125016 Dec = 1E858 Hex - Reading Scale Data (RDGSC.18 ~ 0 value stored into bits 0 - 18);

E –7 is represented as RDGSC.23 ~ 20 = 8 (DP = 7); Direct Scale is represented as RDGSC.19 = 0 (direct scale);

Y = mX + b

WHERE: m - SLOPE (SCALE)  b - OFFSET

X1 X2

 (Y2 - Y1)

m =

 (X2 - X1)

Page 36

Binary Code:

Send command: *W1481E858 (scale = 81E858)

Offset:

Offset is found in the following equation: Reading = Scale x Input value + Offset (Y=mX+b) or the equation can be rewritten as: Offset = Reading – Scale x Input Value (b=Y-mX)

1. Obtain the Offset Factor

Offset = 100 – (0.0125 x 10000) = (-25)

2. Rewrite the Offset Factor as an integer times an exponent

–25 x E0

3. Then encode these values

25 Dec = 00019 Hex Offset Data (RDGOFF.19 ~ 0 value stored into bits 0 – 19)

E0 is represented as RGDOFF.22 ~ 20 = 2 (DP+2=0+2)

Offset is negative represented RDGOFF.23 = 1

Binary Code:

Send command: *W03A00019 (offset=A00019)

See Appendix A for Reading Scale and Offset of Process/Strain Gage Instrument with 10 Linearization Points

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5.7.16 Grouping Commands with the Same Formats

1. The following are of the same format as the Alarm 1 Low data format:

Set Point 1 (command index 01), Set Point 2 (command index 02) Alarm 1 High (command index 13), Alarm 2 Low (command index 15), Alarm 2 High (command index 16), C.J. Offest Adjustment (command index 25).

2. There are two commands using the same Scale-Type format:

Reading Scale (command index 14) and Analog Output Scale (command index 0F)

3. There are two commands using the same Offset-Type format:

Reading Offset (command index 03) and Analog Output Offset (command index 04)

4. Table 5.10 below shows the simple natural numbers, which have a simple data format.

Table 5.10 Commands with Numeric Data Format

Command Function # of Range

index characters

05 ID Code 2 0 ~ 9999 22 Transmit Time Interval 4 0 ~ 1999 (0 = 500 ms) 1A Cycle 1 2 1 ~ 199 Sec 1D Cycle 2 2 1 ~ 199 Sec 21 Address 2 1 ~ 199 17 PB1/Dead Band 1 4 0 ~ 9999 Counts 1C PB1/Dead Band 2 4 0 ~ 9999 Counts 18 Reset 1 4 0 ~ 3999 Sec 19 Rate 1 4 0 ~ 3999 Sec 27 %Low 2 0 ~ 98% 28 %High 2 0 ~ 99%

Example: Set Proportional Band 1 (PB 1) to 150

The command data = 0096Hex. Send: *W170096

5. Time Formats:

Loop Break Time Value MM * 100 + SS (encoded as a 4 digit hex number) Ramp Time HH * 100 + MM (encoded as a 4 digit hex number) Soak Time HH * 100 + MM (encoded as a 4 digit hex number)

Example: Set Loop Break Time to 10 minutes 25 seconds (10:25)

The command data = 0401Hex. Send: *W0B0401

To communicate when the Continuous Mode is enabled, the Continuous Mode must be stopped by sending Crtl S (Xoff) and then send ^AE

Page 38

PART 6

MODBUS PROTOCOL

To Enable the Modbus Protocol, set Modbus menu item to “Yes” in the Bus Format Submenu of the Communication Menu.

6.1 Introduction

Modbus Protocol defines a message structure that iLD Big Display devices will recognize and use, regardless of the type of networks over which they communicate. It describes the process a device uses to request access to another device, how it will respond to requests from the other devices, and how errors will be detected and reported. It establishes a common format for the layout and contents of message fields.

The Modbus Protocol provides the internal standard that the iLD Big Display devices use for parsing messages. During communications on a Modbus network, the protocol determines how each instrument will know its device address, recognize a message addressed to it, determine the kind of action to be taken, and extract any data or other information contained in the message. If a reply is required, the iLD Big Display will construct the reply message and send it using Modbus protocol.

Modbus defines a digital communication network to have only one MASTER and one or more SLAVE devices. Either a single (point-to-point) or multi-drop network (multipoint) is possible.

iLD Big Display devices communicate on standard Modbus networks using RTU (Remote Terminal Unit) transmission mode.

6.2 RTU Mode

In RTU Mode, each eight-bit byte in a message contains two four-bit hexadecimal characters. The main advantage of this mode is that its greater character density allows better data throughput than ASCII for the same baud rate. Each message must be transmitted in a continuous stream.

The following format used for each byte sent and received by i-Series instrument in RTU Mode:

1. Eight-bit binary, Hexadecimal (0 ... 9, A ... F)

2. Two hexadecimal characters contained in each eight-bit field of the message

3. 1 start bit, 8 data bits, 1 Stop Bit (No Parity Bit)

The figure below shows the bit sequences when byte transmitted in RTU Mode.

LSB – Least Significant bit sent first

Page 39

The Modbus Message frame is shown below

DEVICE FUNCTION DATA CRC

ADDRESS CODE CHECK

8 BITS 8 BITS k x 8 BITS 16 BITS

nn nn nnn... nnnn

where: n – character, k – integers depend on the contents of the data format.

6.3 Device Address

The address message frame contains eight bits. The slave device addresses are in the range of 1 ... 199 decimal. A master addresses a slave by placing the slave address in the address field of the message. When the slave sends its response, it places its own address in this address field of the response to let the master know which slave is responding. Address 0 is used for the write command broadcast that commands all devices on network, which all slave devices recognize.

6.4 Function Code

The function code field of a message frame contains eight bits (RTU). Valid codes are in the range of 1 ... 255 decimal. Of these, some codes are applicable for i-Series controllers. When a message is sent from a master to a slave device the function code field tells the slave what kind of action to perform.

The following functions are supported by iLD Big Display devices:

Table 6.1 Function Code

Function Code Function Description 03 Read holding register Reads the binary contents of holding

registers in the slave

04 Read input register Reads the binary contents of input register

in the slave.

06 Preset (Write to) Preset (Write) a value into single holding

single register register

08 Diagnostic Series of tests for checking communication

between master and slave

When the slave responds to the master, it uses the function code field to indicate either a normal (error-free) response or that some kind of error occurred (called an exception response). For a normal response, the slave simply echoes the original function code. For an exception response, the slave returns a code that is equivalent to the original function code with its most significant bit set to a logic 1.

6.5 Data Field

The data field is constructed using sets of two hexadecimal digits, in the range of 00 to FF hexadecimal. The data field of messages sent from a master to slave devices contains additional information, which the slave must use to take the action defined by the function code. This can include items like discrete and register addresses, the quantity of items to be handled, and the count of actual data bytes in the field.

Page 40

6.6 CRC Checking

With RTU Mode the error checking field contains a 16-bit value implemented as two eight-bit bytes (High order byte and Low order byte). The error check value is the result of a Cyclical Redundancy Check (CRC) Calculation performed on the message contents. After building a message (address, function code, data) the transmitting device calculates a CRC Code and puts it to the end of the message. A receiving device will calculate a CRC Code from the message it has received and compare against transmitted CRC Code. If these CRC Codes are different, there has been a communication error. iLD Big Display devices will not reply if they detect a CRC Error.

Sequences of CRC calculation:

1. Load a 16 bit CRC register with all 1’s.

2. Apply first 8 bit byte of the message to the low order byte (LB) of the contents of the register.

3. Exclusive OR these 8 bit with the register contents.

4. Shift the result one bit to the right with zero entering into the high order byte (HB) position and evaluate the LB.

5. If over flow bit in LB is 1, exclusive OR the latest register contents with A001 Hex value.

6. If over flow bit in LB is 0, no exclusive OR occurs (repeat step 4).

7. Repeat steps 4, 5 and 6 until 8 shifts have been performed.

8. Apply next 8 bit byte of the message to the LB contents of the register.

9. Exclusive OR these 8 bit with the register contents.

10. Repeat steps 4 to 9 until all bytes of the message have been processed.

11. The final content of the register is the CRC value.

Examples of CRC calculation sees in Appendix B

When CRC is placed into the end of the message, the low order byte of the CRC will be transmitted first, followed by the High order byte.

Page 41

6.7 Modbus RTU Registers

The table below shows the Modbus registers supported by iLD Big Display devices.

Table 6.2 Modbus Registers

FUNCTION REGISTER FUNCTION VALUE, RANGE

CODE (Decimal)

NO 0 N/A 03/04, 06 1 SETPOINT 1 -1999 to 1999 03/04, 06 2 SETPOINT 2 -1999 to 1999

NO 3 N/A

NO 4 N/A 03/04, 06 5 ID 0 to 9999

NO 6 N/A 03/04, 06 7 INPUT 0 to 255 03/04, 06 8 RDGCNF 0 to 255 03/04, 06 9 ALR1CNF 0 to 255 03/04, 06 10 ALR2CNF 0 to 255 03/04, 06 11 LOOP BREAK TIME 00:00 to 99:59 03/04, 06 12 OUT1CNF 0 to 255 03/04, 06 13 OUT2CNF 0 to 255 03/04, 06 14 RAMP TIME 00:00 to 99:59

NO 15 N/A 03/04, 06 16 COMM. PARAMETERS 0 to 255

NO 17 N/A 03/04, 06 18 ALR1 LOW -1999 to 9999 03/04, 06 19 ALR1 HI -1999 to 9999

NO 20 N/A 03/04, 06 21 ALR2 LOW -1999 to 9999 03/04, 06 22 ALR2 HI -1999 to 9999 03/04, 06 23 PB1/DEAD BAND 1 0 to 9999 03/04, 06 24 RESET 1 0 to 3999 03/04, 06 25 RATE 1 0 to 399.9 03/04, 06 26 CYCLE 1 1 to 199

NO 27 N/A 03/04, 06 28 PB2/DEAD BAND 2 0 to 9999 03/04, 06 29 CYCLE 2 1 to 199 03/04, 06 30 SOAK TIME 00:00 to 99:59 03/04, 06 31 BUS FORMAT 0 to 255 03/04, 06 32 DATA FORMAT 0 to 255 03/04, 06 33 ADDRESS 0 to 199 03/04, 06 34 TRANSIT TIME 0 to 9999

NO 35 N/A

NO 36 N/A

NO 37 N/A 03/04, 06 38 RECOGNITION CHAR. 32 to 126

03/04 39 PROCESS VALUE 03/04 40 PEAK VALUE 03/04 41 VALLEY VALUE 03/04 42 SOFTWARE VERSION

06 43 RESET

Page 42

6.8 Command Format

The following formats are used to SEND commands by computer and RETURNED by the device.

6.8.1 Read Multiple Register (03 or 04)

SENT TO DEVICE:

DEVICE FUNCTION CODE DATA

ADDRESS 03 or 04 STARTING NUMBER OF CRC

REGISTERS REGISTERS

1 BYTE 1 BYTE HB LB HB LB LB HB

nn 03 00 nn 00 nn nn nn

RETURNED FROM DEVICE:

DEVICE FUNCTION CODE DATA

ADDRESS 03 or 04 NUMBER OF FIRST .... n CRC

BYTES REGISTER REGISTER

1 BYTE 1 BYTE 1 BYTE HB LB .... HB LB LB HB

nn 03 nn nn nn nn nn nn nn

Where: HB – High Order Byte

LB – Lower Order Byte Unused bits are set to zero

iLD Big Display devices support only Read Single Register, so the number of registers should always set to 1.

Example:

SENT TO DEVICE: Address 1, Read (03) register 1 (Setpoint 1)

DEVICE FUNCTION STARTING NUMBER OF CRC

ADDRESS CODE REGISTER REGISTERS

01 03 00 01 00 01 D5 CA

To determine the appropriate registers see Table 6.2

RETURNED FROM DEVICE: Setpoint 1 set to 100.0

DEVICE FUNCTION NUMBER OF VALUE OF CRC

ADDRESS CODE BYTES REGISTERS

01 03 02 03 E8 B8 FA

03E8 Hex = 1000 Dec These returned data do not specify the Decimal Point position. The following command will determine the Decimal Point position.

Page 43

Example:

SENT TO DEVICE: Address 09, Read (03) register 08 (Reading Configuration)

DEVICE FUNCTION STARTING NUMBER OF CRC

ADDRESS CODE REGISTER REGISTERS

09 03 00 08 00 01 04 80

RETURNED FROM DEVICE:

DEVICE FUNCTION NUMBER OF VALUE OF CRC

ADDRESS CODE BYTES REGISTERS

09 03 02 00 4A D8 72

004A Hex = 01001010 Bin. This value calls for Decimal Point position number 2 (FFF.F) – see example in 5.7.2 for Reading Configuration.

6.8.2 Write to Single Register (06)

The following command will write a parameter to the single register.

Sent to/Return from device :

DEVICE FUNCTION CODE DATA

ADDRESS 06 REGISTER DATA/ CRC

VALUE

1 BYTE 1 BYTE HB LB HB LB LB HB

nn 06 00 nn 00 nn nn nn

Example: Set Alarm1 Low (register 18) to 300 Dec (12C Hex)

SEND TO DEVICE: Address 20 (14 Hex), write (06) to register 18 (12 Hex) value 300 (12C Hex)

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

14 06 00 12 01 2C 2B 47

RETURNED FROM DEVICE:

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

14 06 00 12 01 2C 2B 47

iLD Big Display devices support only Write to Single Register command

Page 44

Example: Set Alarm2 Low to –100.0 on Device address 20

We have to send two commands to accomplish this task. First, we have to set decimal point into the position 2 (FFF.F) and then, set value of Alarm 2 Low to –1000 counts (disregard decimal point).

1. Set Decimal Point

Set the Decimal point to the position 2 (FFF.F), Temperature unit ºF, Filter constant 4

- see example in 5.7.2

SEND TO DEVICE: Address 20 (Hex 14), write (06) to register 8, data 4A

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

14 06 00 08 00 4A 8B 3A

RETURNED FROM DEVICE:

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

14 06 00 08 00 4A 8B 3A

2. Conversion the Decimal value of (–1000) to Hexadecimal Value:

N = +1000 Dec = 0000 0011 1110 1000 Bin = 2 bytes or 16 bits 1’s complement of N = 1111 1100 0001 0111 Bin = Not N 2’s complement of N = 1111 1100 0001 1000 Bin = 1’s complement of N + 1LSB

F C 1 8 Hex

SEND TO DEVICE: Address 20 (14 Hex), write (06) to register 21 (15 Hex) value (–1000) (FC18 Hex)

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

14 06 00 15 FC 18 DB C1

RETURNED FROM DEVICE:

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

14 06 00 15 FC 18 DB C1

For examples of how to Read/Write data code for INPUT, RDGCNF, ALR1CNF, ALR2CNFG, OUT1CNF, OUT2CNF, COLOR, COMM.PARAMETERS, BUSFORMAT, DATAFORMAT see section 5.7 of this manual.

Page 45

6.8.3 Diagnostic Command

This command echoes the sent message to indicate that the communication link is established correctly.

SEND TO/RETURN FROM DEVICE:

DEVICE FUNCTION DIAGNOSTIC LOOPBACK CRC

ADDRESS CODE CODE DATA

1 BYTE 1 BYTE HB LB HB LB LB HB

nn 08 00 00 nn nn nn nn

Where: Diagnostic Code is two byte code to determine the type of test to be performed. iLD Big Display devices supported only “00” code which requested slave to echo sent command back to the master.

Example:

SEND TO DEVICE: Address 01, Diagnostic command (08), data value 8755 Dec (2233 Hex)

DEVICE FUNCTION DIAGNOSTIC LOOPBACK CRC

ADDRESS CODE CODE DATA

01 08 22 33 00 00 BE B8

RETURNED FROM DEVICE:

DEVICE FUNCTION DIAGNOSTIC LOOPBACK/ CRC

ADDRESS CODE CODE DATA

01 08 22 33 00 00 BE B8

6.8.4 Error Response

When a device can not properly respond to the command due to incorrect or corrupted command, it will respond with an error message. The error massage has the following format:

DEVICE FUNCTION ERROR CRC

ADDRESS CODE RESPONSE

1 BYTE 1 BYTE 1 BYTE LB HB

nn nn nn nn nn

iLD Big Display devices support the following error code messages:

02 – read from/write to the illegal register – read from/write to the register, which is

inactive, or not supported by iLD Big Display devices

03 – write an illegal value – write out of range value

4141

Page 46

4242

Example:

SEND TO DEVICE: Address 05, read (03) register 04 - inactive (see Table 6.2)

DEVICE FUNCTION STARTING NUMBER OF CRC

ADDRESS CODE REGISTER REGISTERS

05 03 00 04 00 01 C4 4F

RETURNED FROM DEVICE:

DEVICE FUNCTION ERROR CRC

ADDRESS CODE RESPONSE

05 83 02 81 30

Example:

SEND TO DEVICE: Address 120 (Hex 78), write (06) to register 35 (Hex 23) - inactive

(see Table 6.2)

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

78 06 00 23 00 00 73 A9

RETURNED FROM DEVICE:

DEVICE FUNCTION ERROR CRC

ADDRESS CODE RESPONSE

78 86 02 12 78

Example:

SEND TO DEVICE: Address 01, write (06) to register 12 (Hex C) value 300 (Hex 12C) –out of range (see Table 6.2)

DEVICE FUNCTION REGISTER DATA/ CRC

ADDRESS CODE VALUE

01 06 00 0C 01 2C 49 84

RETURNED FROM DEVICE:

DEVICE FUNCTION ERROR CRC

ADDRESS CODE RESPONSE

01 86 03 02 61

When a device returns an error message, it adds 80 Hex to the Function Code (03 + 80 = 83 or 06 + 80 = 86)

Page 47

APPENDIX A Reading Scale and Offset for Process/Strain Gage Instrument with 10 Linearization Points (Command Indexes 2B to 33, 34 to 3C, 3D to 45)

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:

The following example assumes load cells with this specification:

Maximum Load: 100 lbs Output: 3.0 mV/V Sensor Excitation: 10 Vdc

Maximum Sensor Output = (Output) x (Sensor Excitation) = 3.0 (mV/V) x 10 (V) = 30 mV Input Value (In) = (Sensor Output) x (Conversion Number) x (Multiplier) See Tables A.1 and A.2 below for proper Conversion and Multiplier Numbers.

Table A.1 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

Table A.2 Input Resolution Multiplier

INPUT RANGE RESOLUTION

LOW HIGH 0 ~ 100 mV 1.0 10.0 0 ~ 1 V 1.0 10.0 0 ~ 10 V 1.0 10.0 0 ~ 20 mA 1.0 10.0

Determine IN min and IN max Input Range and Resolution. For our transducer select 0 - 100 mV range and Low resolution.

IN min = 0 (mV) x 100 (cts/mV) x 1.0 = 0 IN max = 30 (mV) x 100 (cts/mV) x 1.0 = 3000

Page 48

Determine correct values for Display reading (Rd min and Rd max). In most cases, Rd min and Rd max are equal to the minimum and maximum of the transducer output range.

Rd min = 0 Rd max = 100.0

We have to scale our meter to have an input 0 to 3000 (30 mV) displayed as 0 to 100.0 (lbs)

Assume that the shape of the transducer response characteristic is equal to the shape of the parabola (Y=KX^2)

Output = K x Input^2, there K = Output / Input^2 = 100.0 / (3000^2) = 1 / (9 x 10^4)

Output = Input^2/(9 x 10^4)

Let’s build the response characteristic of our transducer based on the seven inputs within the range of the transducer (7 linearization points)

Input (X): In 1=0 In 2=500 In 3=1000 In 4=1500 In 5=2000 In 6=2500 In 7=3000

-------------------------------------------------------------------------------------------------------------------------Output (Y): Rd 1=0 Rd 2=2.8 Rd 3=11.0 Rd 4=25.0 Rd 5=44.4 Rd 6=69.4 Rd 7=100.0

120 100

80 60 40 20

0 1000 2000 3000 4000

The following commands need to be sent to the meter to create this response characteristic.

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.

Reading

Output

Input

Output

Page 49

1. The command for the number of linearization points is 29 (Table 5.4) and the data has an offset of -2. Send command: *W2905 means 7 points of linearization are active.

2. Out of ten points the very first one is not available through the communication commands. The nine points from 1st to 9th must represent min and max of each interval respectively, and the points in between them must be progressively incrementing. The commands for these points are 2B to 33 (Table 5.4)

2.1 Send command: *W2B2001F4 means 5 mV input for Scale 1/Offset 1 is active, DP=2

2.2 Send command: *W2C2003E8 means 10 mV input for Scale 2/Offset 2 is active, DP=2

2.3 Send command: *W2D2005DC means 15 mV input for Scale 3/Offset 3 is active, DP=2

2.4 Send command: *W2E2007D0 means 20 mV input for Scale 4/Offset 4 is active, DP=2

2.5 Send command: *W2F2009C4 means 25 mV input for Scale 5/Offset 5 is active, DP=2

2.6 Send command: *W30200BB8 means 30 mV input for Scale 6/Offset 6 is active, DP=2

3. Calculate Scale.

Rd(n) - Rd(n-1)

Scale = -------------------- , where n is an interger

IN(n) - IN(n-1)

The commands for these points are 34 to 3C (Table 5.4)

3.1 Scale 1 = (28 - 0) / (500 - 0) = 56000 x E-6 56000 Dec = DAC0 Hex is a Reading Scale Data (RDGSC1.18~0 = DAC0) E-6 represented as RDGSC1.23~20 = 7 (DP+1=7) RDGSC1.19 = 0 (direct scale) Send command: *W3470DAC0

3.2 Scale 2 = (110 - 28) / (1000 - 500) = 164000 x E-6 RDGSC2.18~0 = 164000 Dec = 280A0 Hex RDGSC2.23~20 = 7 RDGSC2.19~0 = 0 Send command: *W357280A0

3.3 Scale 3 = (250 - 110) / (1500 - 1000) = 280000 x E-6 RDGSC3.18~0 = 280000 Dec = 445C0 Hex RDGSC3.23~20 = 7 RDGSC3.19~0 = 0 Send command: *W367445C0

Page 50

3.4 Scale 4 = (444 - 250) / (2000 - 1500) = 388000 x E-6 RDGSC4.18~0 = 388000 Dec = 5EBA0 Hex RDGSC4.23~20 = 7 RDGSC4.19~0 = 0 Send command: *W3775EBA0

3.5 Scale 5 = (694 - 444) / (2500 - 2000) = 500000 x E-6 RDGSC5.18~0 = 500000 Dec = 7A120 Hex RDGSC5.23~20 = 7 RDGSC5.19~0 = 0 Send command: *W3877A120

3.6 Scale 6 = (1000 - 694) / (3000 - 2500) = 612000 x E-6 RDGSC6.18~0 = 612000 Dec = 956A0 Hex RDGSC6.23~20 = 7 RDGSC6.19~0 = 0 Send command: *W397956A0

4. Calculate Offset.

Reading = Scale x Input + Offset Offset (n) = Reading (n) - Scale (n) x Input (n), where n is an integer The commands for these points are 3D to 45 (Table 5.4)

4.1 Offset 1 = 28 - (28 - 0) / (500 - 0) x 500 = 0 RDGOFF1.19~0 = 0 Dec = 0 Hex RDGOFF1.22~20 = 2 (DP+2) RDGOFF1.23 = 1 (Offset is negative) Send command: *W3DA00000

4.2 Offset 2 = 110 - (110 - 28) / (1000 - 500) x 1000 = -54 x E0 RDGOFF2.19~0 = 54 Dec = 36 Hex RDGOFF2.22~20 = 2 (DP+2) RDGOFF2.23 = 1 (Offset is negative) Send command: *W3EA00036

4.3 Offset 3 = 250 - (250 - 110) / (1500 - 1000) x 1500 = -170 x E0 RDGOFF3.19~0 = 170 Dec = AA Hex RDGOFF3.22~20 = 2 (DP+2) RDGOFF3.23 = 1 (Offset is negative) Send command: *W3FA000AA

4.4 Offset 4 = 444 - (444 - 250) / (2000 - 1500) x 2000 = -332 RDGOFF4.19~0 = 332 Dec = 14C Hex RDGOFF4.22~20 = 2 (DP+2) RDGOFF4.23 = 1 (Offset is negative) Send command: *W40A0014C

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4.5 Offset 5 = 694 - (694 - 444) / (2500 - 2000) x 2500 = -556 RDGOFF5.19~0 = 556 Dec = 22C Hex RDGOFF5.22~20 = 2 (DP+2) RDGOFF5.23 = 1 (Offset is negative) Send command: *W41A0022C

4.6 Offset 6 = 1000 - (1000 - 694) / (3000 - 2500) x 3000 = -836 RDGOFF6.19~0 = 836 Dec = 344 Hex RDGOFF6.22~20 = 2 (DP+2) RDGOFF6.23 = 1 (Offset is negative) Send command: *W42A00344

A Hard reset command (*Z02) should be sent at the end in order to load the changes into Volatile memory.

Page 52

APPENDIX B ASCII Chart

ASCII Dec Hex Binary ASCII Dec Hex Binary

Char No parity Char No Parity

NUL 00 00 00000000 @ 64 40 01000000

SOH 01 01 00000001 A 65 41 01000000

STX 02 02 00000010 B 66 42 01000010 ETX 03 03 00000011 C 67 43 01000011

EOT 04 04 00000100 D 68 44 01000100

ENQ 05 05 00000101 E 69 45 01000101

ACK 06 06 00000110 F 70 46 01000110

BEL 07 07 00000111 G 71 47 01000111

BS 08 08 00001000 H 72 48 01001000 HT 09 09 00001001 I 73 49 01001001

LF 10 0A 00001010 J 74 4A 01001010

VT 11 0B 00001011 K 75 4B 01001011

FF 12 0C 00001100 L 76 4C 01001100 CR 13 0D 00001101 M 77 4D 01001101 SO 14 0E 00001110 N 78 4E 01001110

SI 15 0F 00001111 O 79 4F 01001111 DLE 16 10 00010000 P 80 50 01010000 DC1 17 11 00010001 Q 81 51 01010001 DC2 18 12 00010010 R 82 52 01010010 DC3 19 13 00010011 S 83 53 01010011 DC4 20 14 00010100 T 84 54 01010100

NAK 21 15 00010101 U 85 55 01010101 SYN 22 16 00010110 V 86 56 01010110

ETB 23 17 00010111 W 87 57 01010111

CAN 24 18 00011000 X 88 58 01011000

EM 25 19 00011001 Y 89 59 01011001 SUB 26 1A 00011010 Z 90 5A 01011010 ESC 27 1B 00011011 [ 91 5B 01011011

FS 28 1C 00011100 \ 92 5C 01011100 GS 29 1D 00011101 ] 93 5D 01011101 RS 30 1E 00011110 ^ 94 5E 0101111 0

US 31 1F 000 11111

95 5F 01 011111

SP 32 20 00100000

96 60 01100000

! 33 21 00100001 a 97 61 01100001 " 34 22 00100010 b 98 62 01100010 # 35 23 00100011 c 99 63 01100011 $ 36 24 00100100 d 100 64 01100100

% 37 25 00100101 e 101 65 01100101

& 38 26 00100110 f 102 66 01100110

39 27 00100111 g 103 67 01100111 ( 40 28 00101000 h 104 68 01101000 ) 41 29 00101001 I 105 69 01101001 * 42 2A 00101010 j 106 6A 01101010

+ 43 2B 00101011 k 107 6B 01101011

44 2C 00101100 l 108 6C 01101100

- 45 2D 00101101 m 109 6D 01101101

46 2E 00101110 n 110 6E 01101110

Page 53

ASCII Chart Continued

ASCII Dec Hex Binary ASCII Dec Hex Binary

Char No parity Char No Parity

/ 47 2F 00101111 o 111 6F 01101111 0 48 30 00110000 p 112 70 01110000 1 49 31 00110001 q 113 71 01110001 2 50 32 00110010 r 114 72 01110010 3 51 33 00110011 s 115 73 01110011 4 52 34 00110100 t 116 74 01110100 5 53 35 00110101 u 117 75 01110101 6 54 36 00110110 v 118 76 01110110 7 55 37 00110111 w 119 77 01110111 8 56 38 00111000 x 120 78 01111000 9 57 39 00111001 y 121 79 01111001

: 58 3A 00111010 z 122 7A 01111010

; 59 3B 00111011 { 123 7B 01111011 < 60 3C 00111100 | 124 7C 01111100 = 61 3D 00111101 } 125 7D 01111101 > 62 3E 00111110 ~ 12 6 7E 0111111 0 ? 63 3F 00111111 DEL 1 27 7F 0 1111111

ASCII Control Codes

ASCII Dec Hex Ctrl Key Definition ASCII Dec Hex Ctrl Key Definition

Char Equiv. Char Equiv.

NUL 00 00 Crtl @ Null Character DC1 17 11 Crtl Q Data Control 1

- XON

SOH 01 01 Crtl A Start of Header DC2 18 12 Crtl R Data Control 2

STX 02 02 Crtl B Start of Text DC3 19 13 Crtl S Data Control 3

- XOFF

ETX 03 03 Crtl C End of Text DC4 20 14 Crtl T Data Control 4

EOT 04 04 Crtl D End of NAK 21 15 Crtl U Negative

Transmission Acknowledge

ENQ 05 05 Crtl E Inquiry SYN 22 16 Crtl V Synchronous

Idle

ACK 06 06 Crtl F Acknowledge ETB 23 17 Crtl W End of Trans

Block

BEL 07 07 Crtl G Bell CAN 24 18 Crtl X Cancel

BS 08 08 Crtl H Back Space EM 25 19 Crtl Y End of

Medium

HT 09 09 Crtl I Horizontal SUB 26 1A Crtl Z Substitute

Tabulation

LF 10 0A Crtl J Line Feed ESC 27 1B Crtl [ Escape

VT 11 0B Crtl K Vertical FS 28 1C Crtl \ File

Tabulation Separator

FF 12 0C Crtl L Form Feed GS 29 1D Crtl ] Group

Separator

CR 13 0D Crtl M Carriage RS 30 1E Crtl | Record

Return Separator

SO 14 0E Crtl N Shift Out US 31 1F Crtl _ Unit Separator

SI 15 0F Crtl O Shift In SP 32 20 Space

DLE 16 10 Crtl P Data Link Escape

Page 54

APPENDIX C Example of CRC Calculation

Device address 06, read (03), starting register 0008, number of registers 0001

CRC Calculation

Function code Two byte (16 bit) Register Overflow

HB LB Bit Load 16 bit register to all 1’s 1111 1111 1111 1111 0 First byte is address 06 0000 0110 Exclusive OR 1111 1111 1111 1001 1st shift 0111 1111 1111 1100 1 A001 1010 0000 0000 0001 Exclusive OR 1101 1111 1111 1101 2nd shift 0110 1111 1111 1110 1 A001 1010 0000 0000 0001 Exclusive OR 1100 1111 1111 1111 3rd shift 0110 0111 1111 1111 1 A001 1010 0000 0000 0001 Exclusive OR 1100 0111 1111 1110 4th shift 0110 0011 1111 1111 0 5th shift 0011 0001 1111 1111 1 A001 1010 0000 0000 0001 Exclusive OR 1001 0001 1111 111 0 6th shift 0100 1000 1111 1111 0 7th shift 0010 0100 0111 1111 1 A001 1010 0000 0000 0001 Exclusive OR 1000 0100 0111 1110 8th shift 0100 0010 0011 1111 0 Second byte Read 03 0000 0011 Exclusive OR 0100 0010 0011 1100 1st shift 0010 0001 0001 1110 0 2nd shift 0001 0000 1000 1111 0 3rd shift 0000 1000 0100 0111 1 A001 1010 0000 0000 0001 Exclusive OR 1010 1000 0100 0110 4th shift 0101 0100 0010 0011 0 5th shift 0010 1010 0001 0001 1 A001 1010 0000 0000 0001 Exclusive OR 1000 1010 0001 0000 6th shift 0100 0101 0000 1000 0 7th shift 0010 0010 1000 0100 0 8th shift 0001 0001 0100 0010 0 Third byte Starting reg. 00 0000 0000 Exclusive OR 0001 0001 0100 0010 1st shift 0000 1000 1010 0001 0 2nd shift 0000 0100 0101 0000 1 A001 1010 0000 0000 0001 Exclusive OR 1010 0100 0101 0001 3rd shift 0101 0010 0010 1000 1 A001 1010 0000 0000 0001 Exclusive OR 1111 0010 0010 1001 4th shift 0111 1001 0001 0100 1

Page 55

CRC Calculation Continued

Function code Two byte (16 bit) Register Overflow

HB LB Bit A001 1010 0000 0000 0001 Exclusive OR 1101 1001 0001 0101 5th shift 0110 1100 1000 1010 1 A001 1010 0000 0000 0001 Exclusive OR 1100 1100 1000 1011 6th shift 0110 0110 0100 0101 1 A001 1010 0000 0000 0001 Exclusive OR 1100 0110 0100 0100 7th shift 0110 0011 0010 0010 0 8th shift 0011 0001 1001 0001 0 Fourth Byte 08 0000 1000 Exclusive OR 0011 0001 1001 1001 1st shift 0001 1000 1100 1100 1 A001 1010 0000 0000 0001 Exclusive OR 1011 1000 1100 1101 2nd shift 0101 1100 0110 0110 1 A001 1010 0000 0000 0001 Exclusive OR 1111 1100 0110 0111 3rd shift 0111 1110 0011 0011 1 A001 1010 0000 0000 0001 Exclusive OR 1101 1110 0011 0010 4th shift 0110 1111 0001 1001 0 5th shift 0011 0111 1000 1100 1 A001 1010 0000 0000 0001 Exclusive OR 1001 0111 1000 1101 6th shift 0100 1011 1100 0110 1 A001 1010 0000 0000 0001 Exclusive OR 1110 1011 1100 0111 7th shift 0111 0101 1110 0011 1 A001 1010 0000 0000 0001 Exclusive OR 1101 0101 1110 0010 8th shift 0110 1010 1111 0001 0 Fifth Byte 00 0000 0000 Exclusive OR 0110 1010 1111 0001 1st shift 0011 0101 0111 1000 1 A001 1010 0000 0000 0001 Exclusive OR 1001 0101 0111 1001 2nd shift 0100 1010 1011 1100 1 A001 1010 0000 0000 0001 Exclusive OR 1110 1010 1011 1101 3rd shift 0111 0101 0101 1110 1 A001 1010 0000 0000 0001 Exclusive OR 1101 0101 0101 1111 4th shift 0110 1010 1010 1111 1 A001 1010 0000 0000 0001 Exclusive OR 1100 1010 1010 1110 5th shift 0110 0101 0101 0111 0 6th shift 0011 0010 1010 1011 1

Page 56

CRC Calculation Continued

Function code Two byte (16 bit) Register Overflow

HB LB Bit A001 1010 0000 0000 0001 Exclusive OR 1001 0010 1010 1010 7th shift 0100 1001 0101 0101 0 8th shift 0010 0100 1010 1010 1 A001 1010 0000 0000 0001 Exclusive OR 1000 0100 1010 1011 Sixth Byte 01 0000 0001 Exclusive OR 1000 0100 1010 1010 1st shift 0100 0010 0101 0101 0 2nd shift 0010 0001 0010 1010 1 A001 1010 0000 0000 0001 Exclusive OR 1000 0001 0010 1011 3rd shift 0100 0000 1001 0101 1 A001 1010 0000 0000 0001 Exclusive OR 1110 0000 1001 0100 4th shift 0111 0000 0100 1010 0 5th shift 0011 1000 0010 0101 0 6th shift 0001 1100 0001 0010 1 A001 1010 0000 0000 0001 Exclusive OR 1011 1100 0001 0011 7th shift 0101 1110 0000 1001 1 A001 1010 0000 0000 0001 Exclusive OR 1111 1110 0000 1000 8th shift 0111 1111 0000 0100 0 CRC code 7F04

Transmitted Message:

DEVICE FUNCTION STARTING NUMBER OF CRC

ADDRESS CODE REGISTER REGISTERS

06 03 00 08 00 01 04 7F

Page 57

Example of CRC calculation in “C” language

This subroutine used to do CRC calculation

#define POLY 0xA001;

unsigned int crc_calculation (unsigned char *start_string, unsigned char number_byte) {

unsigned int crc; unsigned char bit_counter; unsigned char *data_pointer;

data_pointer= start_string; crc = 0xffff; // Initialize crc

while (number_byte>0) {

crc ^= data_pointer // crc XOR with data bit_counter=0; // reset counter

while (bit_counter < 8) {

if (crc & 0x0001)

{ crc >>= 1; // shift to the right 1 position crc ^= POLY; // crc XOR with POLY }

else

{ crc >>=1; // shift to the right 1 position }

bit_counter++; // increase counter }

number_byte--; // adjust byte counter } return (crc); // final result of crc

}

Page 58

APPROVAL INFORMATION

1. Electromagnetic Compatibility (EMC) This device comforms with requirements of EMC Directive 89/336/EEC, amended by 93/68/EEC. This instrument complies with the following EMC Immunity Standards as tested per EN 50082-2, 1995 (Industrial environment)

Phenomena Test Specification Basic Standard

Electrostatic +/- 4 kV contact discharge IEC 1000-4-2 Discharge +/- 8 kV air discharge Performance

Criteria B

Radio Frequency 27 - 1000 MHz IEC 1000-4-3 electromagnetic 10 V/m Performance field. 80% AM (1 KHz) Criteria A

Radio Frequency 900 MHz IEC 1000-4-3 electromagnetic field. 10 V/m Performance Pulse modulated. 50% Duty cycle @ 200 Hz Criteria A

Fast Transients +/- 2 kV (ac mains) IEC 1000-4-4

+/- 1 kV (dc, signal I/O) Performance 5/50 ns Tr/Th, 5 KHz rep. freq. Criteria B

Radio Frequency 0.15 - 80 MHz IEC 1000-4-6 conducted 10 V/m Performance

80% AM (1 KHz) Criteria A

This instrument complies with the following EMC Emission Standards as tested per EN 50081-1, 1992 (Residential, Commercial and Light Industrial)

Phenomena Frequency Limits Basic

Range Standard

Radiated 30-230 MHz 30 dB_V/m at 10 m CISPR 22 Emission 230-1000 MHz 37 dB_V/m at 10 m Class B

quasi peak

Conducted 0.15-0.5 MHz 66-56 dB_V quasi peak CISPR 22 Emission 0.5-5 MHz 56 dB_V quasi peak Class B

5-30 MHz 60 dB_V quasi peak

2.Safety

This device conforms with Low Voltage Directive 73/23/EEC, amended by 93/68/EEC. The following LVD requirements have been met to comply with EN 61010-1, 1993 (Electrical equipment for measurement, control and laboratory use)

1. Pollution Degree 2

2. Installation Category II

3. Double Insulation

4. Class I Equipment (Units with 100-240 Vac Power)

Page 59

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 61 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal five (5) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems relative to the product.

Page 60

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

TEMPERATURE

Thermocouple, RTD & Thermistor Probes, Connectors,

Panels & Assemblies

Wire: Thermocouple, RTD & Thermistor

Calibrators & Ice Point References

Recorders, Controllers & Process Monitors

Infrared Pyrometers

PRESSURE, STRAIN AND FORCE

Transducers & Strain Gages

Load Cells & Pressure Gages

Displacement Transducers

Instrumentation & Accessories

FLOW/LEVEL

Rotameters, Gas Mass Flowmeters & Flow Computers

Air Velocity Indicators

Turbine/Paddlewheel Systems

Totalizers & Batch Controllers

pH/CONDUCTIVITY

pH Electrodes, Testers & Accessories

Benchtop/Laboratory Meters

Controllers, Calibrators, Simulators & Pumps

Industrial pH & Conductivity Equipment

DATA ACQUISITION

Communications-Based Acquisition Systems

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Signal Conditioners

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HEATERS

Heating Cable

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Flexible Heaters

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ENVIRONMENTAL MONITORING AND CONTROL

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pH, Conductivity & Dissolved Oxygen Instruments

M3730/0818