Omega iDRX-ACC, iDRX-ACV, iDRX-FP, iDRX-TC, iDRX-ST User Manual

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iDRX-ACC, iDRX-ACV, iDRX-FP,

iDRX-PR, iDRX-RTD, iDRX-ST,

iDRX-TC

Communication Manual for

iDRX Signal Conditioner Series

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 mark to every

appropriate device upon certification.

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

WARN ING: These products are not designed for use in, and should not be used for, patient connected applications.

This device is marked with the international caution symbol. It is important to read the Setup Guide before installing or commissioning this device as it contains important information relating to safety and EMC.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

WHAT SIGNAL CONDITIONERS DO: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

II. MODEL OF UNIT : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

III. RS485 SERIAL COMMUNICATION SETUP: . . . . . . . . . . . . . . . . . . . . . 1

IV. COMMANDS FOR ACCESSING EEPROM: . . . . . . . . . . . . . . . . . . . . . . 5

V. DESCRIPTION OF DATA : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

VI. COMMANDS FOR MEASUREMENT VALUES: . . . . . . . . . . . . . . . . . . . 16

VII. COMMANDS FOR READING MODEL/INPUT TYPE: . . . . . . . . . . . . . . 17

VIII. RESET COMMANDS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

IX. SAMPLE PROGRAM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

X. MODBUS REGISTER DEFINITIONS: . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

SPECIFICATIONS

iDRX-ACC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

iDRX-ACV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

iDRX-FP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

iDRX-PR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

iDRX-RTD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

iDRX-ST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

iDRX-TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

ILLUSTRATIONS

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Typical Computer Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

This device is marked with the international Caution symbol. It is important to read this manual before installing or commissioning this device as it contains important information relating to Safety and EMC (Electromagnetic Compatibility).

Unpacking & Inspection

Unpack the instrument and inspect for obvious shipping damage. Do not attempt to operate the unit if damage is found.

For instruments with AC Voltage and AC Current inputs, observe the input signal connections in the appropriate section of this manual. These instruments must only be installed by professional electricians.

• Do not exceed voltage rating on the label located on the instrument housing.

• Always disconnect power before changing signal and power connections.

• Do not use this instrument on a work bench without its case for safety reasons.

• Do not operate this instrument in flammable or explosive atmospheres.

• Do not expose this instrument to rain or moisture.

• Unit mounting should allow for adequate ventilation to ensure instrument does not exceed operating temperature rating.

• Use electrical wires with adequate size to handle mechanical strain and power requirements. Install without exposing bare wire outside the connector to minimize electrical shock hazards.

SAFETY CONSIDERATIONS

EMC Considerations

• Whenever EMC is an issue, always use shielded cables.

• Never run signal and power wires in the same conduit.

• Use signal wire connections with twisted-pair cables.

• Install Ferrite Bead(s) on signal wires close to the instrument if EMC problems persist.

Failure to follow all instructions and warnings may result in injury!

I. WHAT SIGNAL CONDITIONERS DO:

The iDRX Series Signal Conditioners are high performance devices used as a front end for PLC’s and Data Acquisition systems to measure a variety of low level transducer signals with high precision and accuracy. The iDRX Series Signal Conditioners interface directly to transducers and digitize the input signal. The measured signal is then transmitted to a PLC or a computer using the RS485 Serial

Communication. Up to 32 units may be connected to the same serial RS485 bus, and each unit

may be addressed to transmit the signal being measured under program control, executed on a PLC or a computer. The key features of the iDRX Series Signal Conditioners are the ease of set-up and factory calibrated ranges. All range switching are done electronically by sending the appropriate command; therefore, there is no need to remove or open the units when signal input levels are changed. All set-up may be done by using the Set-up Software running on a computer or by user supplied programs.

II. MODEL OF UNIT :

There are 7 models available:

THERMOCOUPLE ( iDRX-TC ) RTD ( iDRX-RTD ) STRAIN ( iDRX-ST ) PROCESS ( iDRX-PR ) FREQUENCY/PULSE ( iDRX-FP ) AC VOLT ( iDRX-ACV ) AC CURRENT ( iDRX-ACC )

III. RS485 SERIAL COMMUNICATION SETUP:

Communication with the UNIT will be performed via serial communication using RS485 standard (half duplex). To use the RS485 communication for the Signal Conditioners you’ll need an available Communication port in your computer and have access to a generic communication software program

(e.g.: Procomm conditioner communication software program is also available as an option to speed the set-up. A RS232 to RS485 converter box will also be required if your computer communications port is RS232.

Procomm is a registered trademark of Datastorm Technologies, Inc.

Windows is a registered trademark of Microsoft Corp.

HyperTerminal is a registered trademark of Microsoft Corp.

, Windows2HyperTerminal3, etc, see details below for information). A RS485 signal

Page 1

For Procomm:

Start the Procomm Program.

Press ALT + P (Select the appropriate communication parameters: Baud Rate, Parity, Data Bits, Stop Bits.) The default settings may require modifications.

- Factory Default communication settings are as follows: Baud Rate = 9600 Parity = Odd Data Bits = 7 Stop Bits = 1

Press ALT + S (To save current communication settings) Press ALT + O (To go to chat mode) If the communication port selected is available and the communication parameters of both the computer and the iDRX are matched, then a serial link may be established. To check the

communication any of the commands may be tried i.e. *01X01 would return the current

measured signal value.

For Hyper Terminal (Windows 95):

Start the Hyper Terminal Program from programs/accessories.

Click on the Properties from the File menu.

Under the Phone Number Menu choose: Connect using “Direct to COM1 or COM2” whichever that’s available. Click on Configure Button.

Choose: Baud rate, Data bits, Parity and Stop bits

According to iDRX’s settings. Flow Control = None. Click “OK” Button.

- Factory Default communication settings are as follows: Baud Rate = 9600 Parity = Odd Data Bits = 7 Stop Bits = 1

Under Settings Menu:

Click ASCII Setup Button. Choose all options except “Force Incoming Data to 7 Bits ASCII”. Click “OK” Button.

Page 2

Communication Parameter Settings:

Communication settings information are very critical during set-up, if any of the parameters are changed, it should be recorded on the label for future reference. If the communication parameters used by the computer does not match the communication parameter of the iDRX, then the communication link may not be established. Hence it is important to record the communication parameter on the label if different from default.

Resetting Communication Parameters to Factory Defaults

To restore the communication parameters to the factory default settings, two test points must be shorted together. There are two ways of shorting these test points together, both are detailed below and shown in the following figure.

Version A-- Test point TP6 must be shorted, by a wire, to test point TP17.

Version B-- Newer units have a jumper position S1-A for connecting these two test points together.

Factory Default Settings for Communication:

Baud Rate = 9600 Data Bit = 7 Parity = Odd Stop Bits = 1 Recognition Character = * Address = 01

Page 3

Open the Signal Conditioner Unit

Disconnect all signal input and outputs before attempting this procedure.

Instructions

1) To open the Signal Conditioner Unit—Remove Side Covers from Unit by removing 4 screws, using a Phillips head screwdriver.

2) Short TP6 & TP17 together, either by wire or

, if available, jumper S1-A.

3) After shorting TP6 to TP17, apply power to the unit.

4) The Front Panel Power Indicator (LED) will NOT

turn on.

5) After power has been applied to the unit for about 3 seconds, remove jumper S1-A or open the TP6 & TP17 connection without turning off the power.

Opening Unit

Solder wire from TP6 to TP17 on solder side of board.

Version A Testpoint/Jumper Locations Version B

Install Jumper onto S1-A on component side of board.

6) The communication parameters now have been restored to the default settings temporarily in RAM memory. (If power is removed from the unit, the RAM memory will be lost and the communication parameters will be lost.)

Page 4

7) To read the default communication parameters, type the following command using HyperTerminal or some other terminal communication program.

^AE01

8) The unit will respond with the following ASCII characters depending on the model of iDRX unit.

PR/FP/ST TC/RTD/ACV/ACC 2A011C0D 2A01140D

9) The ASCII response is decoded below:

2A = Recognition Character = * 01 = Unit Address = 01 1C = Command Mode, Multipoint Address, Echo ON, Checksum OFF, Line Feed OFF 0D = 9600 Baud, Odd Parity, 7 Data Bits, 1 Stop Bit

10) To permanently write the above default communication parameters to EEPROM send the following sequence of commands:

*01W0B2A Unit Response = 01W0B *01W0A01 Unit Response = 01W0A *01W081C Unit Response = 01W08 *01W070D Unit Response = 01W07 *01Z01 Unit Response = 01Z01 LED on iDRX unit will blink

11) The default communication parameters are now permanently stored in the unit’s EEPROM and will not be lost upon power removal.

12) Use the iDRX Set-up Program to establish communication with the unit.

13) This procedure will not affect calibration. It only resets the communication parameters to the factory default settings.

Page 5

IV. COMMANDS FOR ACCESSING EEPROM:

NO. command letter index meaning # of bytes

1. R,W 01 Input range or function 1

2. R,W 02 Input/output Configuration 1

3. R,W 03 Decimal point 1

4. R,W 04 Filter time constant 1

5. R,W 05 Reading Scale 3

6. R,W 06 Reading Offset 3

7. R,W 07 Communication parameters 1

8. R,W 08 Communication bus format 1

9. R,W 09 Communication Data format 1

10. R,W 0A Communication device address1

11. R,W 0B Communication recog. char. 1

12. R,W 0C Unit of measure 3

13. R,W 0D Gate time 1

14. R,W 0E Debounce time 1

15. R,W 0F Transmit time 2

16. R,W 12 Reading Scale (iDRX-PR) 3

17. R,W 13 Reading Offset (iDRX-PR) 3

NOTE:

1. Data (Number of hex digits) = 2 * number of bytes

2. command letter

meaning R Read from EEPROM W Write to EEPROM

3. "W" commands should be followed by "Z01" command for new values to take effect.

A. COMMAND FORMAT (TRANSMITTING):

*[nn]Cxx[data][hh]<cr>

Note:

Data is required if Command Letter is “W”

B. RESPONSE FORMAT (RECEIVING):

A. Correct response :

1. If unit is in echo mode [nn]Cxx[data][hh]<cr>

*echo mode = unit will send back the command.

* (see "BUS FORMAT") :

Page 6

2. If unit is not in echo mode :

i. For the commands which require the data to be transmitted by the iDRX Signal

Conditioner, data is sent in the following formats:

data[hh]<cr>

ii. For the commands which do not require the data:

NO RESPONSE

B. Error response:

NOTE :

1. If unit is in echo mode

[nn]?ee<cr>

2. If unit is not in echo mode

?ee<cr>

[ ] : Means will be used wherever applicable.

* : Is the security recognition character(default is “*”).

nn : Is the unit's address in hexadecimal(default is 01).

Address may be from 01 to FF.

C : Is the command letter ( must be capital ).

W : For writing to the EEPROM (requires data)

R : For reading from the EEPROM (doesn’t require data)

xx : Command index is a hexadecimal number from 01 to FF.

data : Is one, two, or three bytes (2,4,6 characters respectively). It will be in

hexadecimal format except when command "X" is executed in which case it is in decimal format.

hh : Is checksum characters

( Required if Checksum option is on. See “BUS FORMAT”).

The checksum is one byte (two characters) that is the simple hexadecimal addition of all the previous bytes, ignoring any overflow.

Page 7

+ 25 hidden pages

Omega iDRX-ACC, iDRX-ACV, iDRX-FP, iDRX-TC, iDRX-ST User Manual

Specifications and Main Features

Frequently Asked Questions

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