Omega DRX-P, DRX-FP, DRX-ST, DRX-ACC, DRX-TC User Manual

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UserÕs Guide

DRX-ACC, DRX-ACV, DRX-FP,

DRX-PR, DRX-RTD, DRX-ST,

DRX-TC

Communication Manual for

DRX Signal Conditioner Series

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

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installing or commissioning this device as it contains important information relating to safety and EMC.

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TABLE OF CONTENTS

I. WHA

T SIGNAL CONDITIONERS DO: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

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

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

SAFETY CONSIDERATIONS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

IV. COMMANDS FOR ACCESSING EEPROM: . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

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

VII. COMMANDS FOR READING MODEL/INPUT TYPE: . . . . . . . . . . . . . . . 16

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

IX. SAMPLE PROGRAM: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

SPECIFICATIONS

DRX-ACC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

DRX-ACV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DRX-FP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

DRX-PR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

DRX-RTD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

DRX-ST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

DRX-TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

ILLUSTRATIONS:

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Typical Computer Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

i

ii

NOTES

I. WHAT SIGNAL CONDITIONERS DO:

The DRX 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 DRX 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 DRX 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 set­up 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 ( DRX-TC )
RTD ( DRX-RTD )
STRAIN ( DRX-ST )
PROCESS ( DRX-PR )
FREQUENCY/PULSE ( DRX-FP )
AC VOLT ( DRX-ACV )
AC CURRENT ( DRX-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

1

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

Page 1

1

Procomm is a registered trademark of Datastorm Technologies, Inc.

2

Windows is a registered trademark of Microsoft Corp.

3

HyperTerminal is a registered trademark of Microsoft Corp.

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 DRX 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 T

erminal (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 DRX’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 DRX, 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.

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

or

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

DRX -- SIGNAL CONDITIONERS WITH RS485

SERIAL COMMUNICATION PORT

COMPUTER

RS232 TO

RS485 CONVERTER

HALF—DUPLEX

NOTE: YOU CAN CONNECT A DRX
DIRECTLY TO THE COMPUTER IF YOU
HAVE A RS485 COMMUNICATION
CARD INSTALLED IN THE COMPUTER.

SYSTEM GND

OR SHIELD

FIRST UNIT ON BUS LAST UNIT ON BUS

TEE COUPLER

(JACKS SHOWN

FOR CLARITY)

SHIELDED WIRE

CONNECT LAST
UNIT WITH
JUMPER TO
INCLUDE 120Ω
ON THE BUS

DIN RAIL

Page 4

SAFETY CONSIDERATIONS

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.

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!

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).

SAFETY NOTE: Disconnect all signal input and outputs before attempting this procedure.
Instructions

1) Open the Signal Conditioner Unit—Remove Side Covers from Unit by lifting at the “angled
corners” first, using a flat-head screwdriver. Continue detaching remaining edges of the Cover.

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 30 seconds, turn power off.

6) The communication parameters now have been restored to the default settings.

7) Use the DRX Set-up Program to establish communication with the meter.

8) This procedure will not affect calibration. It only resets the communication parameters.

Page 5

Solder wire from
TP6 to TP17 on
Solder side of Board.

Install Jumper onto
S1-A on Component
Side of Board.

Version A Version B

Testpoint/Jumper Locations

Lift Cover at Angled Corners.

Side Cover
Remove to
Access
Testpoints.

Front Panel

Side Cover
Remove to
Access S1-A
Jumper

Six Attachments Per Side

Lift Cover at Angled Corners.

Opening Unit

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 address 1

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

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 ef

fect.

A. COMMAND FORMAT (TRANSMITTING):

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

Note:

Data is required if Command Letter is “W”

B. RESPONSE FORMA

T (RECEIVING):

A. Correct response :

1. If unit is in echo mode

* (see "BUS FORMAT") :

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

*echo mode = unit will send back the command.

Page 6