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UserÕs Guide
®
http://www.omega.com
e-mail: info@omega.com
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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® omega.com ® OMEGA ® OMEGAnet On-Line Service Internet e-mail http://www.omega.com info@omega.com Servicing North America: USA: One Omega Drive, P.O. Box 4047 ISO 9001 Certified Stamford CT 06907-0047 TEL: (203) 359-1660 FAX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1 TEL: (514) 856-6928 FAX: (514) 856-6886 e-mail: info@omega.ca For immediate technical or application assistance: ® USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA ® Customer Serv
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TABLE OF CONTENTS I. WHAT SIGNAL CONDITIONERS DO: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 II. MODEL OF UNIT : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 III. RS485 SERIAL COMMUNICATION SETUP: . . . . . . . . . . . . . . . . . . . . . . . . . 1 SAFETY CONSIDERATIONS: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 IV. COMMANDS FOR ACCESSING EEPROM: . . . . . . . . . . . . . . . . .
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NOTES ii
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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
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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
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DRX -- SIGNAL CONDITIONERS WITH RS485 SERIAL COMMUNICATION PORT RS232 TO RS485 CONVERTER HALF—DUPLEX COMPUTER NOTE: YOU CAN CONNECT A DRX DIRECTLY TO THE COMPUTER IF YOU CONNECT LAST HAVE A RS485 COMMUNICATION UNIT WITH SYSTEM GND CARD INSTALLED IN THE COMPUTER. JUMPER TO OR SHIELD INCLUDE 120Ω ON THE BUS TEE COUPLER SHIELDED WIRE (JACKS SHOWN FOR CLARITY) DIN RAIL FIRST UNIT ON BUS LAST UNIT ON BUS Communication Parameter Settings: Communication settings information are very critical during s
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SAFETY CONSIDERATIONS 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
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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 b
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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
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2. If unit is not in echo mode : i. For the commands which require the data to be transmitted by the DRX Signal Conditioner, data is sent in the following formats: data[hh] ii. For the commands which do not require the data: NO RESPONSE B. Error response: 1. If unit is in echo mode: [nn]?ee 2. If unit is not in echo mode: ?ee NOTE : [ ] : Means will be used wherever applicable. * : Is the security recognition character(default is “*”). nn : Is the unit's address in hexadecimal(defaul
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?ee : Special code indicating an error has occurred as: ?43 : Command error ( occurs if command letters and indexes are invalid) ?46 : Format error ( occurs if length of the data or number of characters is not correct ) ?48 : Checksum error ( occurs if checksum is not correct ) ?50 : Parity error ( occurs if parity is not correct ) : Carriage return Note: If Baud rate, Recognition character or address are not correct then the UNIT will not respond. V. DESCRIPTION OF DATA : For the following
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b. INPUT RANGE BIT NO. VALUE RTD Bits: 1-0 00 100 ohms 01 500 ohms 10 1000 ohms 11 10 ohms COPPER 2 0 PLATINUM 1 NICKEL 3 0 DIN STANDARD 1 NIST FOR Pt (SAMA FOR Ni) 5-4 00 2 wire 01 3 wire 10 4 wire 11 not used 6 not used 7 0 Line frequency = 60Hz 1 Line frequency = 50Hz c. INPUT RANGE BIT NO. VALUE PROCESS (PR) STRAIN (ST) 3-0 0000 0-20 mA 30 mV 0001 400 mV 100 mV 0010 1 V --- 0011 2 V --- 0100 5 V --- 0101 10 V --- (0110 - 1111 not used) 4 0 14V Excit. Internal excit. 1 10V Excit. External
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d. INPUT RANGE BIT NO. VALUE FREQUENCY/PULSE (FP) 0 0 ---- 1 Low input level 1 0 ---- 1 Debounce contact 2 0 ---- 1 3K pull up to 5V 3 0 ---- 1 1K pull down 5-4 00 12.5V excit. 01 5V excit. 10 8V excit. 11 not used 7-6 not used 2. INPUT/OUTPUT CONFIGURATION: This is one byte data (2 characters). Bit pattern is: BIT NO. VALUE MEANING TC/RTD ACV/ACC/ST PR FP 1-0 00 Degree C ---- ---- 01 Degree F ---- Freq. mode 10 Degree K ---- Totalizer ---- 11 Degree K ---- Totalizer Freq. mode 2 0 Temp. compe
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Note 1: Bit 2&3 set the speed of process totalize. The time it would take process totalize to reach the non-totalize reading is shown in the following table: Bit 3 Bit 2 Time to reach regular reading 0 0 1 minute 0 1 1 hour 1 0 1 day 1 1 30 day 3. DECIMAL POINT : This is one byte (2 characters) as: value meaning 1 XXXXXX. 2 XXXXX.X 3 XXXX.XX 4 XXX.XXX 5 XX.XXXX 6 X.XXXXX Note 1: For TC and RTD models, value must be 1 to 3 only. 4. FILTER TIME CONSTANT: This is one byte (2 characters) as: value
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5. READING SCALE: Multiplication factor applied to input to get a higher or lower reading. This is 3 byte data (6 characters) as follows: - Bits 0 to 18 (19 bits) are value of the scale from 0 to 500000 - Bit 19 is sign, 0 for positive and 1 for negative - Bits 20 to 23 are for decimal point value = DP It means as: Actual decimal value = 10 ** ( 1 - DP ) where ** means "TO THE POWER OF" example: if scale is -0.000345678.= - 345678 x 10**(-9) value will be 345678 decimal = 5464E hex bit 19 =1 f
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PARITY = bits 4,3 and are: 00 for NO 01 for ODD 10 for EVEN 11 not used DATA BIT = bit 5 and is: 0 for 7 data 1 for 8 data STOP BIT = bit 6 and is: 0 for 1 stop 1 for 2 stop Bit 7 : always 0 Note 1: Stop bit is always 1. Unless 7 data, no parity is selected then unit will use 2 stop bits. Note 2: When 8 Data bit is selected, only NO PARITY is allowed. 8. BUS FORMAT: This is one byte data as: Bit 0 = 0/1 means checksum not included/included Bit 1 not used Bit 2 = 0/1 means no echo/echo Bit 3 = 1
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9. DATA FORMAT: This is one byte and specifies the data which will be transmitted against the "V01" command. Bit pattern: bit 0 = 0/1 Means do not include/include peak & valley status register. bit 1 = 0/1 Means do not include/include reading. For models(TC/RTD/ACV/ACC): bit 2 = 0/1 Means do not include/include peak reading. For models(PR/ST): bit 2 = 0/1 Means do not include/include process totalize. For models(TC/RTD/ACV/ACC): bit 3 = 0/1 Means do not include/include valley reading. For models
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12. UNIT OF MEASURE: This is 3 bytes. It is ASCII value of unit of measure. 13. GATE TIME(For FP model only): This is 1 byte from 00 to FF. For value = 00 to FA: Each count equals 10ms. If 0 then gate time = 3ms. Example : 1 second gate time = 64 hex. For value = FB to FF: Value Gate time FB 5 seconds FC 10 seconds FD 20 seconds FE 40 seconds FF 80 seconds 14. DEBOUNCE TIME(For FP model only): This is 1 byte from 01 to FF. Each count equals 5ms. If 0 then error. 15. TRANSMIT TIME: This is 2 byt
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VI. COMMANDS FOR MEASUREMENT VALUES: Command Receiving value *01X01 (For all models): Reading value. After reading scale and offset. Note: In order to have continuous update on reading. Customer should send X01 command every time reading is requested. Models(TC/RTD/ACV/ACC): *01X02 Peak reading value. *01X03 Valley reading. Models(PR/ST/FP): *01X03 Peak reading value. *01X04 Valley reading. *01V01 (For all models): String of values. Received values are in decimal with decimal point and no sign f
