Omega i-SERIES User Manual
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Omega i-SERIES User Manual

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Monitor / Controller
C C o o m m m m u u n n i i c c a a t t i i o o n n M M a a n n u u a a l l

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  • Page 1 User’ s Guide Shop on line at ® ® www.omega.com e-mail: info@omega.com For iSeries info: www.omega.com/specs/iseries For latest product manuals: www.omegamanual.info Monitor / Controller C C o o m m m m u u n n i i c c a a t t i i o o n n M M a a n n u u a a l l...
  • Page 2 It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

  • Page 3: Table Of Contents

    Communication Interfaces............5 Wiring RS-232 Interface .............5 Wiring RS-485 Interface .............6 Part 4: Communication Setup ................9 Flow Chart ..................9 Setup the i-Series Device Through the Front Panel ....10 Abbreviations, Range, Default Setup........10 Part 5: i-Series Protocol..................13 Command Structure ..............13 Command Formats ..............14 Response Format ..............19...
  • Page 4 Part 6: Modbus Protocol...................34 Introduction................34 RTU Mode ...................34 Device Address ................35 Function Code................35 Data Field..................35 CRC Checking................36 Modbus RTU Registers .............37 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...
  • Page 5 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.

  • Page 6: Part 1: Before You Begin

    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.

  • Page 7: Part 2: Introduction To Digital Communication

    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 i-Series controllers. It has been assumed that the user has some experience of communication protocols and some familiarity with i-Series controllers.

  • Page 8: Figure 2.1 Transmission Of "C

    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. i-Series controllers use i-SERIES and MODBUS communication protocols.

  • Page 9: Part 3: Hardware

    • The RS-232 standard (point-to-point) allows a single device to be connected to a PC. The i-Series 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.

  • Page 10: Wiring Rs-485 Interface

    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 i–Series device. DB-9 CONNECTOR i-SERIES Figure 3.1 Wiring between DB9 computer connector and RS-232 controller interface DB-25 CONNECTOR...

  • Page 11: Figure 3.3 Multipoint, Half-Duplex Rs-485 Wiring

    Figure 3.3 shows multipoint, half-duplex RS-485 interface connections for i-Series. Figure 3.3 Multipoint, Half-Duplex RS-485 wiring Value of the termination resistor is not critical and depends on the cable impedance.

  • Page 12: Table 3.3 Rs-485 Half Duplex Hook-Up

    PIN FUNCTION DB9 DB25 COMPUTER i-Series LABEL SIDE SIDE Rx/Tx SEE CONVERTER’S -Rx/-Tx Rx/Tx MANUFACTURING +Rx/+Tx Common ground SPECIFICATION Communication Interfaces shown above are those which used on i-Series devices. Other types of Communication Interfaces are not covered in this chapter.

  • Page 13: Part 4: Communication Setup

    PART 4 COMMUNICATION SETUP 4.1 Flow Chart Figure 4.1 Flow Chart for Communication Option...

  • Page 14: Setup The I-Series Device Through The Front Panel

    4.2 Setup the i-Series 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.
  • Page 15 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 –...
  • Page 16 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.

  • Page 17: Part 5: I-Series Protocol

    PART 5 i-SERIES PROTOCOL To Enable the i-Series Protocol, set 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.

  • Page 18: Command Formats

    “<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 i-Series devices. Table 5.3 Command Letters and Suffix for Temperature/Process and Process/Strain Gauge...
  • Page 19 Command Letters and Suffixes Continued Command Command Function Command # Of Default Index Bytes Characters Value ANLSCL 9186A0 COMM.PARAMETERS COLOR AL1LO A003E8 AL1HI 200FA0 GPRW RDGSCL 100001 AL2LO A003E8 AL2HI 200FA0 GPRW PB1/DEAD BAND 00C8 GPRW RESET 1 00B4 GPRW RATE 1 0000 GPRW...

  • Page 20: Table 5.4 Command Letters And Suffix

    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 200000 200000 GPRW RDGOFF 200000 ANLOFF 400000 0000 INPUT GPRW RDGCNF AL1CNFG AL2CNFG LOOP BREAK TIME 003B OUT1CNF OUT2CNF...
  • Page 21 Command Letters and Suffixes Continued Command Command Function Command # Of Default Index Bytes Characters Value INPUT FOR SCALE 1 INPUT FOR SCALE 2 INPUT FOR SCALE 3 INPUT FOR SCALE 4 INPUT FOR SCALE 5 Linearization Points INPUT FOR SCALE 6 INPUT FOR SCALE 7 INPUT FOR SCALE 8 INPUT FOR SCALE 9...
  • Page 22 After modifying any settings with use of W prefix commands, a Hard Reset command should be sent in order to load 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.

  • Page 23: Response Format

    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:...

  • Page 24: Error Message

    4. Serial Device Address Error occurs if the new value is larger than 199 decimal. 1. The i-Series 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 addresses do not match.

  • Page 25: Examples Of Transmitted Data

    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 –...

  • Page 26: Command Formats

    5.7 Command Formats The following conditions are assumed in the examples of this section. 1. The recognition character is the asterisk (*). 2. The meter use RS-232 interface standard (point-to-point communication). 3. When “W” command is given, a reset is necessary to initiate the command. 4.

  • Page 27: Input Type For Process/Strain Gauge

    5.7.1.2 Input Type Format for Process/Strain Gauge Instrument BIT POSITION INPUT CLASS, RANGE OR TYPE Voltage 0 ~ 100 mV Voltage 0 ~ 1 V Voltage 0 ~ 10 V Voltage 0 ~ 20 mA Ratio Disable Ratio Enable Low Resolution High Resolution Peak Value Gross Value...

  • Page 28: Reading Configuration For Process/Strain Gauge

    5.7.2.2 Reading Configuration Format for Process/Strain Gauge Instrument BIT NUMBER FUNCTION Not Allowed Decimal Point 1 (FFFF) Decimal Point 2 (FFF.F) Decimal Point 3 (FF.FF) Decimal Point 4 (F.FFF) Load (On line Cal) Disable Load Enable Filter Constant 1 Filter Constant 2 Filter Constant 4 Filter Constant 8 Filter Constant 16...

  • Page 29: Color Display (Command Index 11)

    5.7.4 Color Display (Command Index 11) Description: CLR.76543210 means 8 bit positions of the Command Data. BIT NUMBER FUNCTION Alarm 2 Color AMBER Alarm 2 Color GREEN Alarm 2 Color RED Alarm 1 Color AMBER Alarm 1 Color GREEN Alarm 1 Color RED Normal Color AMBER Normal Color GREEN Normal Color RED...

  • Page 30: Alarm 1 Low (Command Index 12)

    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 –...

  • Page 31: Output 1 Configuration (Command Index 0C)

    5.7.8 Output 1 Configuration (Command Index 0C) Description: OUT1CNG.76543210 means 8 bit positions of the Command Data. BIT NUMBER FUNCTION Auto Tune PID Stop Auto Tune PID Start Anti Wind Up Disable Anti Wind Up Enable Auto PID Disable Auto PID Enable Reverse Direct Analog Proportional 0 –...

  • Page 32: Communication Parameters (Command Index 10)

    5.7.10 Communication Parameters (Command Index 10) Description: COMM.PAR.76543210 means 8 bit positions of the Command Data. BIT NUMBER FUNCTION 1 Stop Bit 2 Stop Bit 7 Bit 8 Bit No Parity Even 300 Baud 1200 2400 4800 9600 19200 Example: Set Baud Rate 9600, Odd Parity, 7 Bit, 1 Stop. The command data is 00001101Bin = 0Dhex.

  • Page 33: Data Format (Command Index 20)

    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 No Unit Unit No Valley or Gross Valley or Gross No Peak Peak No Reading Reading...

  • Page 34: Low And % Hi (Command Index 27 And 28)

    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)
  • Page 35 Scaling: Y = mX + b WHERE: m - SLOPE (SCALE) b - OFFSET (Y2 - Y1) (X2 - X1) To remap 4 – 20 mA to a displayed reading from 0 to 100 then use slope: Rd2 – Rd1 Slope (Scale) = ------------------- In2 –...
  • 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.

  • Page 37: Grouping Commands With The Same Formats

    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.

  • Page 38: Part 6: Modbus Protocol

    If a reply is required, the i-Series will construct the reply message and send it using Modbus protocol.

  • Page 39: Device Address

    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.

  • Page 40: Crc Checking

    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. i-Series devices will not reply if they detect a CRC Error. Sequences of CRC calculation: 1.

  • Page 41: Modbus Rtu Registers

    6.7 Modbus RTU Registers The table below shows the Modbus registers supported by i-Series devices. Table 6.2 Modbus Registers FUNCTION REGISTER FUNCTION VALUE, RANGE CODE (Decimal) 03/04, 06 SETPOINT 1 -1999 to 1999 03/04, 06 SETPOINT 2 -1999 to 1999...

  • Page 42: Command Format

    Where: HB – High Order Byte LB – Lower Order Byte Unused bits are set to zero i-Series 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)

  • Page 43: Write To Single Register (06)

    SEND TO DEVICE: Address 20 (14 Hex), write (06) to register 18 (12 Hex) value 300 (12C Hex) DEVICE FUNCTION REGISTER DATA/ ADDRESS CODE VALUE RETURNED FROM DEVICE: DEVICE FUNCTION REGISTER DATA/ ADDRESS CODE VALUE i-Series devices support only Write to Single Register command...

  • Page 44: Table 6.1 Function Code

    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.

  • Page 45: Diagnostic Command

    1 BYTE 1 BYTE Where: Diagnostic Code is two byte code to determine the type of test to be performed. i-Series 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...
  • Page 46 Example: SEND TO DEVICE: Address 05, read (03) register 04 - inactive (see Table 6.2) DEVICE FUNCTION STARTING NUMBER OF ADDRESS CODE REGISTER REGISTERS RETURNED FROM DEVICE: DEVICE FUNCTION ERROR ADDRESS CODE RESPONSE Example: SEND TO DEVICE: Address 120 (Hex 78), write (06) to register 35 (Hex 23) - inactive (see Table 6.2) DEVICE FUNCTION...

  • Page 47: Appendix A Reading Scale And Offset

    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 =...
  • 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)
  • Page 49 1. The command for number of linearization points is 29 (Table 5.4) and the data has offset -2. Send command: *W2905 means 7 point of linearization are active. 2. Out of ten points the very first one is not available through the communication commands.
  • 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...
  • Page 51 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)

  • Page 52: Appendix Bascii Chart

    APPENDIX B ASCII Chart ASCII Binary ASCII Binary Char No parity Char No Parity 00000000 01000000 00000001 01000000 00000010 01000010 00000011 01000011 00000100 01000100 00000101 01000101 00000110 01000110 00000111 01000111 00001000 01001000 00001001 01001001 00001010 01001010 00001011 01001011 00001100 01001100 00001101 01001101 00001110...

  • Page 53: Ascii Control Codes

    ASCII Chart Continued ASCII Binary ASCII Binary Char No parity Char No Parity 00101111 01101111 00110000 01110000 00110001 01110001 00110010 01110010 00110011 01110011 00110100 01110100 00110101 01110101 00110110 01110110 00110111 01110111 00111000 01111000 00111001 01111001 00111010 01111010 00111011 01111011 < 00111100 01111100 00111101...

  • Page 54: Appendix C Examples Of Crc Calculation

    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 Load 16 bit register to all 1’s 1111 1111 1111 1111 First byte is address 06 0000 0110 Exclusive OR...
  • Page 55 CRC Calculation Continued Function code Two byte (16 bit) Register Overflow A001 1010 0000 0000 0001 Exclusive OR 1101 1001 0001 0101 5th shift 0110 1100 1000 1010 A001 1010 0000 0000 0001 Exclusive OR 1100 1100 1000 1011 6th shift 0110 0110 0100...
  • Page 56 CRC Calculation Continued Function code Two byte (16 bit) Register Overflow A001 1010 0000 0000 0001 Exclusive OR 1001 0010 1010 1010 7th shift 0100 1001 0101 0101 8th shift 0010 0100 1010 1010 A001 1010 0000 0000 0001 Exclusive OR 1000 0100 1010...

  • Page 57: Example Of Crc Calculation In "C" Language

    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...
  • Page 58 CE APPROVALS INFORMATION This product conforms to the EMC directive 89/336/EEC amended by 93/68/EEC, and with the European Low Voltage Directive 72/23/EEC. Electrical Safety EN61010-1:2001 Safety requirements for electrical equipment for measurement, control and laboratory. Double Insulation Pollution Degree 2 Dielectric withstand Test per 1 min •...
  • Page 59 WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of one (1) year from the date of purchase. In addition to OMEGA’s standard warranty period, OMEGA Engineering will extend the warranty period for four (4) additional years if the warranty card enclosed with each instrument is returned to OMEGA.
  • Page 60 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop on line at www.omega.com TEMPERATURE Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies Wire: Thermocouple, RTD & Thermistor Calibrators & Ice Point References Recorders, Controllers & Process Monitors...

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