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JEWELL JD Series, Руководство пользователя

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JDx QUICK START GUIDE 

 

 

 

 

 

 

 

15 | P a g e  

 

Q S 8 7 9 8 3 8 ,   R E V   A . 6

 

3.2.17

 

R

ELATIVE 

Z

ERO

9

 

The JDx family f sensors offers you the ability to compensate for any installation offsets you may encounter.  This alleviates 
the majority of tolerance concerns when designing brackets or mounting surfaces for the JDx.  When the command is issued 
to capture a relative zero, the device will capture its next reading as the new zero point.  A non-volatile save (see section 
3.2.8) is required for this value to persist following a power cycle or manual reset.   

Command Syntax 

;<NodeID>,Z,1

CRLF

 

 

 

or 

:<NodeID>,Z,1,<CRC16>

CRLF

 

Response Syntax 

Varies per number of axes in your product: 
<NodeID>,Z,1,<1

st

 axis offset>,…,<CRC16>CRLF 

Example Command 

;027,Z,1

CRLF

 

Example Response 

027,Z,1,-74.4550,Software zero,4756CRLF 

(Single axis inclinometer) 

027,Z,1,-74.1570,-7.2397,Software zero,547E  (Dual axis inclinometer) 

 

3.3

 

DATA INTEGRITY, CRC 

All responses from the JDx sensor include an ASCII based 16-bit CRC value.  The value is provided so that the customer may 
choose to validate packet content integrity in any environment.  The CRC implementation was borrowed from the CRC 
calculation algorithm used by the Modbus protocol

10

.   The CRC value is always the last 2 bytes prior to the CR and LF which 

represents the last four ASCII characters of the transmitted packet. 

 

3.4

 

SHARED RS-485 BUS 

A helpful resource for RS-485 networks and implementation is authored by Texas Instruments

11

. 

 

 

 

9

 It is possible for Jewell to pre-load a relative zero into the device, please contact 

[email protected]

 for details. 

10

 See 

http://modbus.org/docs/PI_MBUS_300.pdf

 (page marked “112”).  See also https://www.libcrc.org/ specifically 

https://www.libcrc.org/crc_modbus/

.  The JDx implements revision 69 of the “libcrc.org” code. 

11

 The RS-485 Design Guide, authored by Texas Instruments, 

http://www.ti.com/lit/an/slla272c/slla272c.pdf

 

Содержание JD Series

Страница 1: ... 9 8 3 8 R E V A 6 JDx Series User Guide 850 Perimeter Road Manchester NH 03103 Phone 603 669 6400 Fax 603 622 2690 www jewellinstruments com sales jewellinstruments com Copyright 2019 by Jewell Instruments LLC All rights reserved ...

Страница 2: ... 21 17 Production release A 4 7 27 17 Relative Zero command detailed 000 Q Q Query Summary command documented Fifo flush V command note added A 5 8 28 17 Adding Modbus notes New parity error strict vs ignore paradigm Adding Rolling Average functionality A 6 4 18 2019 Removed extraneous Modbus Notes Parity Update ...

Страница 3: ...ttings 3 3 2 Firmware Commands Protocols 3 3 2 1 General Command Formats 4 3 2 2 Get Value 5 3 2 3 Streaming 6 3 2 4 Sensor Node ID Address 7 3 2 5 Bandwidth 8 3 2 6 Change Baud Rate 9 3 2 7 Decimation 10 3 2 8 Non Volatile Save 10 3 2 9 Non Volatile Restore 11 3 2 10 Query 11 3 2 11 RS 485 Termination 12 3 2 12 Data FIFO Query 13 3 2 13 Data FIFO Dump 13 3 2 14 Data FIFO Flush 13 3 2 15 Bus Scan ...

Страница 4: ...E iii P a g e Q S 8 7 9 8 3 8 R E V A 6 TABLE OF FIGURES Figure 1 JDx Outline Dimensions 2 TABLE OF TABLES Table 1 JDx Series DB9 Pinout 1 Table 2 JDx Series Default Communication Settings 3 Table 4 JDx Bandwidth vs Baud 8 ...

Страница 5: ...or 0x__ 0x indicates hexadecimal notation CR Carriage Return hexadecimal 0x0D LF Line Feed hexadecimal 0x0A also known as a new line CRLF Abbreviation for the line termination sequence Carriage Return Line Feed CRC16 16 bit cyclic redundancy check pipe is used to separate parameters in a list of options in the firmware commands The user should select one parameter only ...

Страница 6: ...stallation 2 1 MECHANICAL CONNECTIONS The inclinometer comes fitted with an IP67 rated male DB9 connector In order to achieve the full IP67 rating an appropriate mating connector with an IP67 rated backshell must be employed and fully engaged IP67 backshells are readily available from suppliers such as NorComp Conec and Digi Key The pinout for the JDx sensor is provided below Table 1 JDx Series DB...

Страница 7: ... B signals The RS 485 A signal is pulled high and the RS 485 B signal is pulled low to the RS 485 ground reference Standard future revisions will not have the bus biasing resistors installed though they will be available for custom orders 2 4 GALVANIC ISOLATION JDX GROUNDING TRANSIENT PROTECTION Both the power connections and RS 485 connections are Galvanically isolated from the internal sensor Th...

Страница 8: ...ion settings firmware commands and protocols The JDX supports a proprietary ASCII interface protocol 3 1 DEFAULT COMMUNICATION SETTINGS The defaults for the communication settings are listed below Of the settings shown below only the baud and parity may be changed Table 2 JDx Series Default Communication Settings Baud 19200 Data Bits 8 Parity Even Stop Bits 1 Flow Control None 3 2 FIRMWARE COMMAND...

Страница 9: ... which begin with a semicolon will not invoke the 16 bit CRC check within the device Commands which begin with a colon must include a 16 bit CRC and the JDx will enforce CRC checking The latter implementation allows the JDx sensor to check data packet integrity in noisy environments It is up to the discretion of the user to implement one or the other Please also take note of the commas and the Nod...

Страница 10: ...on 3 2 13 Command Syntax NodeID VCRLF or NodeID V CRC16 CRLF Response Syntax Varies per sample type reflecting the sensor configuration purchased4 NodeID V 41 X G s Temperature seq CRC16 CRLF NodeID V 42 X G s Y G s Temperature seq CRC16 CRLF NodeID V 43 X G s Y G s Z G s Temperature seq CRC16 CRLF NodeID V 51 X angle Temperature seq CRC16 CRLF NodeID V 52 X angle Y angle Temperature seq CRC16 CRL...

Страница 11: ... CRLF Response Syntax NodeID S 0 OFF 1 ON Streaming CRC16 CRLF Subsequent data points will adhere to the V command s syntax see section Error Reference source not found Example Command 009 S 1CRLF Example Response 009 S 1 Streaming F465CRLF 009 V 7 2 9175 0 3806 17 620 20 ACA9CRLF 009 V 7 2 9182 0 3804 17 618 21 7B87CRLF 009 V 7 2 9190 0 3806 17 618 22 E773CRLF Note A Non Volatile Save command is ...

Страница 12: ...teger value from 1 to 250 is accepted Command Syntax NodeID A New_NodeID CRLF or NodeID A New_NodeID CRC16 CRLF Response Syntax NodeID A New_NodeID Address CRC16 CRLF Example Command 001 A 2CRLF Example Response 002 A 002 Address CRC16 CRLF Note A Non Volatile Save command is required to save the new NodeID to non volatile memory This will ensure the parameter is recalled after a power cycle CRC16...

Страница 13: ...OK OK Command Syntax NodeID B 3 9 7 8 15 6 31 2 62 5 125 CRLF or NodeID B 3 9 7 8 15 6 31 2 62 5 125 CRC16 CRLF Response Syntax NodeID B NewDataRate Data rate NewBW 3dB CRC16 CRLF Example Command 001 B 15 6CRLF Example Response 001 B 15 6 Data rate 3 9 3dB 2258CRLF Note A Non Volatile Save command is required to save the new New_Bandwidth to non volatile memory This will ensure the parameter is re...

Страница 14: ...sponse Syntax NodeID C B New_Baud 8 parity 1 1 sec delayed baud change CRC16 CRLF NodeID C B New_Baud 8 parity 1 New baud CRC16 CRLF Example Command 001 C B 115200 nCRLF Example Response 003 C B 115230 8n1 1 sec delayed baud change 01F1CRLF 003 C B 115230 8n1 New baud F98A001 C B 115200 8n1 New baud D511CRLF Note A Non Volatile Save command is required to save the new New_Baud baud to non volatile...

Страница 15: ...A Non Volatile Save command is required to save the new New_Average to non volatile memory This will ensure the parameter is recalled after a power cycle Sample data rate will be affected by this value CRC16 is reported in hexadecimal 3 2 8 NON VOLATILE SAVE This command saves the current settings of the JDx sensor to non volatile memory The non volatile save command should be issued when the user...

Страница 16: ...EPROM are reported for informational use Calc ed CRC ROM CRC CRC16 are reported in hexadecimal 3 2 10 QUERY This command queries the settings of the JDx sensor and transmits it out to the RS 485 bus for the user to review how the JDx sensor is configured Command Syntax NodeID Q Q B D CRLF or NodeID Q Q B D CRC16 CRLF where Q B D is one of the following select one only Q is full report B bandwidth ...

Страница 17: ...ed 2017may12 A 27 O 52 R 2 S 0 T 0 X 1 Z 0 GC 9 050 OC 2078 250 ODR 3 906 D 1 baud 113636 3AABCRLF 3 2 11 RS 485 TERMINATION This command enables or disables the 120 Ω termination resistor within the JDx sensor Each JDx sensor is shipped from the factory with the termination resistor enabled The value of 0 disables the termination resistor while the value of 1 enables the resistor The user must en...

Страница 18: ...LF Example Response 001 F Q 27 D1C1CRLF 3 2 13 DATA FIFO DUMP This command will create a short stream of data similar to the streaming function but it will cease once it has emptied the FIFO Command Syntax NodeID F DCRLF or NodeID F D CRC16 CRLF Response Syntax NodeID F D Dumping N entries CRC16 CRLF Example Command 000 F DCRLF Example Response 250 F D Dumping 2 entries 85D0CRLF 250 V R 393 1333 2...

Страница 19: ...e 249 2566CRLF 250 7958CRLF Note This command has delayed responses based on the actual addresses present on the bus Approximate completion times are 500000 baud 0 205 seconds 115200 baud 0 460 seconds 9600baud 4 1 seconds 300 baud 128 0 seconds 3 2 16 SOFT RESET If for some reason you need to issue a soft reset command to the sensor this command is available This will not cycle power to any porti...

Страница 20: ...ftware zero 547E Dual axis inclinometer 3 3 DATA INTEGRITY CRC All responses from the JDx sensor include an ASCII based 16 bit CRC value The value is provided so that the customer may choose to validate packet content integrity in any environment The CRC implementation was borrowed from the CRC calculation algorithm used by the Modbus protocol10 The CRC value is always the last 2 bytes prior to th...

Страница 21: ... goods or parts thereof manufactured by others and resold by Jewell Jewell will pass on to the customer the benefit of any guarantee or warranty received by Jewell from the original manufacturer insofar as such guarantee or warranty is assignable ANY OTHER CONDITIONS OR WARRANTIES WHETHER EXPRESS OR IMPLIED BY STATUTE OR OTHERWISE ARE EXCLUDED THE REMEDIES PROVIDED HEREIN ARE THE BUYER S SOLE AND ...

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