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4-7 

4.1.5  Fisher ProVox Protocol 

(Optional) 

DXp-15 transmitters may be ordered with the 
Fisher ProVox protocol. Units equipped with this 
option communicate with a Fisher ProVox 
C16921 external interface card, configured for 
the 'Toledo' interface. For a further description of 
the hardware and software aspects of this 
interface, refer to BLH technical document TD-
073. 

Definitions for the byte and bit formats 
transmitted by the DXp-15 are presented below. 
To select the ProVox protocol option, DIP switch 
positions 1-3 must be set to 14,1. Baud rate is 
fixed at 4800 continuous output. 

NOTE: Hardware requirement - An external 
hardware converter is required to change the 
DXp-15 RS-485 output to 20 mA current loop for 
interface with the ProVox CL6921 card. 

FISHER PROVOX INTERFACE 

1.  TRANSMTT ONLY FORMAT - approx. 

every 200ms 

2.  BYTE FORMAT -10 BIT ASCII: 1 start, 

7 data, 1 parity - even, 1 stop 

3.  DATA OUTPUT FORMAT - 

GROSS/TARE or NET/TARE provided - 
(tare always =0) 

4.  TOTAL (RESPONSE PACKET) 

FORMAT -18 bytes - 4800 baud 

– 

continuous 

 

Summary of Contents for DXP10

Page 1: ...WEIGH SYSTEM TECHNOLOGY BLH DXP10 15 Weigh Transmitters Operator s Manual TM002 RevG 6 1 11 Doc 35102 ...

Page 2: ...ar purpose BLH shall not be held liablefor errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this publication or its contents BLH reserves the right to revise this manual at any time and to make changes inthe contents hereof without obligation to notify any person of such revision or changes Call 781 298 2216 for BLH Field Se...

Page 3: ...FICATIONS 1 2 1 4 ORDERING SPECIFICATIONS 1 4 1 5 WARRANTY POLICY 1 4 1 6 FIELD ENGINEERING 1 4 SECTION 2 Installation 2 1 2 1 INTRODUCTION 2 1 2 1 1 General 2 1 2 2 MOUNTING 2 1 2 2 1 Standard Units 2 1 2 2 2 Explosion Proof and Division 2 Options 2 1 2 3 ELECTRICAL 2 2 2 3 1 Transducer Inputs 2 2 2 3 2 Serial Communication 2 2 2 3 3 Analog Output 2 3 2 3 4 Mains AC Power Figure 2 4 2 3 2 3 5 Aux...

Page 4: ...mmunication 4 1 4 1 GENERAL 4 1 4 1 1 LCp 40 Digi System Network 4 1 4 1 2 Standard Simplex Output Continuous Output 4 1 4 1 3 Computer Terminal Interface Optional 4 2 4 1 4 MODBUS BTU Protocol Optional 4 4 4 1 5 Fisher ProVox Protocol Optional 4 7 4 1 6 Allen Bradley Remote I O Optional 4 8 SECTION 5 Operation 5 1 5 1 GENERAL 5 1 5 2 GROSS WEIGHT WEIGHING 5 1 5 3 ZERO OPERATION 5 1 5 4 NET WEIGHT...

Page 5: ...et up and operation each model is identical Using RS 485 serial communication protocol up to sixteen DXp transmitters can be networked to an LCp 40 41 or 42 Network Controller The serial format can also be configured to provide point to point or network communication to a customer supplied computer 1 1 2 Standard Instrument The standard instrument includes an RS 485 serial port with BLH Digi Syste...

Page 6: ...al rack Since a PLC logical rack consists of 128 input and 128 output bits or points DXp units communicate 32 input and 32 output bits 1 4 logical rack format For a full description of logical rack addressing and data communications formatting reference the Allen Bradley Remote I O technical manual BLH part number TM010 1 2 6 Analog Option An optional analog output provides both a 4 20 mA and a 0 ...

Page 7: ...4X 11 5 x 8 0 x 4 3 HWD Explosion Proof 12 875 x 10 875 x 8 188 HWD OPTIONS Isolated Analog Output Type 12 bit Digital to Analog Conversion Voltage 0 to 10 volt 25K ohm min load Current 4 to 20 mA 1000 ohm max load SERIAL COMMUNICATION LCp 40 Network Standard Type RS 485 Half Duplex Multi Drop Baud 56 7k Simplex Data Output Standard Interface Type RS 485 Simplex Data Format Simplex ASCII Data 7 Da...

Page 8: ...r replacements or for any damages from delay or loss of use for other indirect or consequential damages of any kind BLH may use improved designs of the parts to be replaced This guarantee shall not apply to any material which shall have been repaired or altered outside of BLWs plant in any way so as in BLH s judgment to affect its strength performance or reliability or to any defect due in any par...

Page 9: ...used for mounting to a pipe support The instrument should be installed in a vibration free location within the normal length of the load cell cables If conduit is used drains should be provided to reduce the possibility of condensate entering the enclosure Outline dimensions for the standard DXp 10 15 transmitter are presented in Figure 2 1 2 2 2 Explosion Proof and Division 2 Options DXp units ma...

Page 10: ...4 must be connected to the sense terminal blocks in the DXp 10 15 Figure 2 2 Jumpers JF1 and JP2 must be removed 2 3 2 Serial Communication If a deadweight or substitution method of calibration is being used the load cal cable can be shortened as required The leads should be re tinned before the final connection is made NOTE If tension or universal load cells are used red signal and white signal l...

Page 11: ...inal is provided for permanent transmitter power connection DXp transmitters can be switch selected to operate at 115 or 220 VAC see SW1 Figure 2 4 Before connecting power to the unit verify that the proper power selection has been made The two position terminal block is equipped with a clear plastic cover to prevent operator injury Cable can be either solid or stranded 12 or 14 gage with a ground...

Page 12: ...selections for transmitter address baud rate and serial interface format are presented and defined in SECTION IV Serial Communication 3 2 4 Input Range Selection Units are shipped configured for a 25 mV input range To increase this range to 35 my remove the jumper shunt from JP2 on the A D converter board as shown in Figure 3 1 see Appendix A photo for A D board location Figure 3 1 35 mV Input Con...

Page 13: ... perform remote calibration Consult SECTION IV for serial communication details 3 3 4 LCp 40 Calibration When networked to an LCp 40 41 or 42 controller the DXp 10 15 can be remotely calibrated using the controller display and keypad In this configuration up to five linearized span points can be entered Appendix E presents step by step flow diagrams for remote LCp 40 calibration and parameter set ...

Page 14: ...tput to a voltage or current meter 2 Establish Zero Reference First Span Point Make sure that all dead weight vessel mixer pipes etc is applied as it will be during normal operation Move the five position slide switch Figure 3 2 to the analog zero position Use the increment decrement toggle switch to adjust the analog output so that the desired value is displayed on the meter Holding the toggle sw...

Page 15: ...lect Decimal Position M I or D 400 00 DECIMAL Change Decimal Position E 400 00 Enter Decimal E 0 050 GRAD Graduation Setting M I or D E 0 050 0 050 0 050 GRAD Modify Graduation Increment Decrement Enter E 102 OVER Overrange Setting M I or D OFF 102 Select OFF or 102 E 20 ZERO Change Zero Selection M I or D 2 ZERO Select 2 or 20 Full Scale Zero Allowance E 2 ZERO Enter Selection E OFF MN BAND Chang...

Page 16: ...r remotely via the serial port This feature provides a check of the instrument calibration to verify that drift or other problems have not occurred Check cal uses an internal shunt resistor circuit to provide a fixed repeatable signal into the input of the transmitter The input signal produces a known output which can be verified by viewing the terminal meter used to perform calibration Due to the...

Page 17: ...Optional digital filtering offers the benefits of successive averaging without the corresponding delay in response time to real weight changes Digital filtering software determines the number of A I conversions to be averaged on a moving basis Figure 3 3 Conventional averaging takes place at the selected rate within a window of counts defined as band Table 3 6 If the signal exceeds the band count ...

Page 18: ...ion Hold toggle switch to INC DEC press enter key for selections Setting Flashes Conversions Averaged 1 1 2 2 3 4 4 8 5 16 6 32 7 64 8 128 Insert averaging value as selected in table above D doubles averaging value selection 3 6 Factory Default Calibration Table 3 7 presents the DXp 10 1 5 factory calibration default parameters All DXp units shipped by BLH are calibrated to the specifications show...

Page 19: ... at high speed This format is not intended for direct interface with a terminal or computer The baud rate is selectable to accommodate systems with very long low baud or short high baud distances between DXp units 4 1 2 Standard Simplex Output Continuous Output The simplex output format is designed to transmit gross weight data ASCII coded to a remote terminal or computer The accuracy of this poin...

Page 20: ...re essential when performing remote calibration and parameter set up Table 4 3a Computer Terminal Interface Protocol ASCII Command Description Action Response W Weight Return Current Weight Data and Mode Information stx adr pol data sp units mode stat tc CRLF G GROSS Switch to Gross Mode stx adr pol data sp units G stat tc CRLF N Net Switch to Net Mode stx adr pol data sp units N stat tc CRLF T Ta...

Page 21: ...it Same as Exit key Monitor Mode Only C Cal Same as Cal key Monitor Mode Only AXX Address 01 16 Enable Addressed DXp Unit Note 1 In auto mode 90 millisecond temperature compensation cycles occur once every 2 seconds Temperature cycles are inhibited if there is critical positive or negative system motion Note 2 Remote filter and averaging selections are not stored in EEPROM EEPROM values will be lo...

Page 22: ...in Tables 4 1 and 4 2 page 4 1 MODBUS protocol formats are presented on the following pages Figure 4 2 DIP Switch Selections for MODBUS Protocol MODBUS FUNCTIONS SUPPORTED 02 Read Input Status 03 Read Holding Registers 06 Preset Single Register 16 10 Hex Preset Multiple Registers DATA FORMATS FORMAT 1 One 16 bit signed integer 32768 to 32767 for all data FORMAT 2 Two 16 bit signed integers for wei...

Page 23: ...6 2 NET 40003 1 40036 2 40068 2 DXP10 15 READ WRITE REGISTERS Functions 03 06 format 1 only 16 READ WRITE FORMAT 1 FORMAT 2 FORMAT 3 ADR REG ADR REG ADR REG TARE 40004 1 40038 2 40070 2 ZERO 40005 1 40040 2 40072 2 ZERO UMIT 40006 1 40042 1 40074 1 FILTER TUNE 40007 1 40043 1 40075 1 AVERAGING 40008 1 40044 1 40076 1 MOTION 40009 1 40045 1 40077 1 MOTION TIMER40010 1 40046 1 40078 1 SPAN CAL 40011...

Page 24: ...ouble current averaging setting MOTION MOTION TIMER setting counts setting time 0 OFF 0 0 8 sec 1 1 1 1 6 sec 2 2 2 32 sec 3 3 3 6 4 sec If the count difference from conversion to conversion is greater than the motion setting the motion status bit is set to 1 Once the count difference from conversion to conversion returns to be equal to or less than the motion setting the motion bit remains set fo...

Page 25: ...ts transmitted by the DXp 15 are presented below To select the ProVox protocol option DIP switch positions 1 3 must be set to 14 1 Baud rate is fixed at 4800 continuous output NOTE Hardware requirement An external hardware converter is required to change the DXp 15 RS 485 output to 20 mA current loop for interface with the ProVox CL6921 card FISHER PROVOX INTERFACE 1 TRANSMTT ONLY FORMAT approx ev...

Page 26: ...rface option This option is available via a technology licensing agreement between BLH and Allen Bradley Functionally this interface allows up to 8 BLH DXp 15 transmitters to communicate with an AB PLC 5 or SLC 5 programmable logic controller using discrete data transfers Consult BLH manual TM010 for complete details ...

Page 27: ...s the output to zero Taring allows the operator to achieve a new zero reference before addition of each ingredient so that errors do not become cumulative 5 6 ERROR DETECTION When the DXp is reporting weight data to a host computer dashes will be transmitted if an overrange condition occurs When connected to an LCp 40 the node identification and dashes will be transmitted and displayed When used i...

Page 28: ...or Press Reset on DXp 10 15 Press exit on LCp 40 NOTE If pressing reset on the DXp does not clear an EE error consult factory Flashing Display Explanations As seen on LCp 40 display or computer terminal Operating Mode Key Pressed Flashing Display Explanation Gross TARE LB KG Cannot tare gross weight Gross ZERO LB KG Current weight out of zero range Gross DISPLAY No Change Display set to show gross...

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Page 32: ...4 Appendix C Wiring and Outline Drawings CustomerWiringDiagram StandardUnitOutline Explosion Proof Enclosure Outline ...

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Page 37: ...can be calibrated and configured remotely using an LCp 40 series network controller Remote calibration configuration provides the advantage of displaying parameter entries for maximum setup accuracy The following pages present flow diagrams for each available remote parameter entry ...

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Page 42: ...BLH 3 Edgewater Drive Norwood MA 02062 U S A Phone 781 298 2200 Fax 781 762 3988 www vishaypg com ...

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