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Summary of Contents for JEWELL JD Series
- Page 1 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. Q S 8 7 9 8 3 8 , R E V A . 6...
- Page 2 JDx QUICK START GUIDE REVISION HISTORY Revision Date Change Description 6/21/17 Production release 7/27/17 Relative Zero command detailed “;000,Q,Q” Query Summary command documented Fifo flush – “V” command note added 8/28/17 Adding Modbus notes New parity error “strict” vs. “ignore” paradigm Adding “Rolling Average”...
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Page 3: Table Of Contents
JDx QUICK START GUIDE TABLE OF TABLES ................................... iii MANUAL ACRONYMS & NOTATIONS ............................. iv OVERVIEW ..................................1 INSTALLATION ................................. 1 Mechanical Connections ............................1 Mechanical Installation ............................2 RS-485 Installation ..............................2 Galvanic Isolation & JDx Grounding & Transient Protection .................. 2 JDx COMMUNICATION PROTOCOLS .......................... - Page 4 JDx QUICK START GUIDE 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 iii | P a g e Q S 8 7 9 8 3 8 , R E V A .
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Page 5: Manual Acronyms & Notations
JDx QUICK START GUIDE MANUAL ACRONYMS & NOTATIONS Jewell Digital Inclinometer Jewell Digital Accelerometer JDI or JDA Sensor 0x__ 0x indicates hexadecimal notation Carriage Return, hexadecimal 0x0D Line Feed, hexadecimal 0x0A (also known as a new line) Abbreviation for the line termination sequence “Carriage Return & “Line Feed”... -
Page 6: Overview
JDx QUICK START GUIDE OVERVIEW This quick start guide covers the installation and operation of all models of the Jewell Digital Inclinometer. The inclinometer provides continuous dual axis measurements of inclination via ASCII over RS-485 over the sensor’s linear range with resolution down to 0.001 degree. -
Page 7: Mechanical Installation
2.3 RS-485 INSTALLATION The JDx sensor may be installed on an RS-485 bus. Jewell recommends that the sensor installer review appropriate guidelines for multiple devices on a bus. The JDx sensor contains a 120 Ω termination resistor at the PCB level near the internal RS-485 transceiver. -
Page 8: Jdx Communication Protocols
JDx QUICK START GUIDE JDX COMMUNICATION PROTOCOLS The JDx sensor data is easy to retrieve from the sensor as a simple and intuitive protocol has been implemented. To obtain this data, a simple terminal emulation program (or equivalent) may be used on the system/computer side. The sections below outline the communication settings, firmware commands, and protocols. -
Page 9: General Command Formats
3.2.1 G ENERAL OMMAND ORMATS Jewell ASCII command protocol conforms to a basic format as described in the following section(s). 3.2.1.1 P ASCII ROPRIETARY Commands are packets transmitted from the “master” to the “slave.” The slave is always the JDx sensor – it provides the response. -
Page 10: Get Value
JDx QUICK START GUIDE 3.2.2 G ALUE This command obtains the most recent sample from the JDx sensor. This command is useful when the JDx sensor is installed on a shared RS-485 bus and the user wishes to implement the JDx sensor as a true slave device. The last parameter before the CRC is a 16-bit sequence number. -
Page 11: Streaming
JDx QUICK START GUIDE 3.2.3 S TREAMING This command enables the JDx sensor to continuously transmit data out to the RS-485 bus at the bandwidth specified in section 3.2.5. A value of 0 or 1 must be provided. The value of 0 turns off data streaming, while the value 1 enables data streaming. -
Page 12: Sensor Node Id, Address
JDx QUICK START GUIDE 3.2.4 S ID, A ENSOR DDRESS This command changes the NodeID, or bus address of the JDx sensor. Each JDx sensor is shipped from the factory with a default NodeID, corresponding to the last two digits of the specific sensor’s serial number. Changing the address is very simple if the user wishes to assign something other than the factory default. -
Page 13: Bandwidth
JDx QUICK START GUIDE 3.2.5 B ANDWIDTH This command changes the output data rate (aka data sample rate) of the JDx sensor. The table below shows the combinations which are allowed vs the baud rate. Care must be taken in selecting the bandwidth of the sensor and the baud of the sensor. -
Page 14: Change Baud Rate
JDx QUICK START GUIDE 3.2.6 C HANGE This command changes the baud rate of the JDx sensor. Each JDx sensor is shipped from the factory with a default Baud of 19200 bps. The baud value must be an integer between 300 and 500,000. Please note that the streaming feature is only supported above 9600 baud. -
Page 15: Decimation
JDx QUICK START GUIDE 3.2.7 D ECIMATION NOTE: This command is intended only for cases where the desired data rate is below 4Hz. (Geophysical/geotechnical monitoring, etc.) This command changes the output data rate by decimation. Each JDx sensor is shipped from the factory with a default averaging of 1 sample, i.e, no averaging. -
Page 16: Non-Volatile Restore
JDx QUICK START GUIDE 3.2.9 N OLATILE ESTORE This command restores the JDx sensor to its last saved settings from within the non-volatile memory. The non-volatile restore command should be issued when the user wishes to recall the previously saved settings. Command Syntax ;<NodeID>,N,R CRLF... -
Page 17: Rs-485 Termination
CRLF Example Command ;000,Q,Q CRLF Example Response 027,Q,Q,<ISO 8859-1>©2017 Jewell Instruments,Factory-Use,Beta_27,SW_Rev=792,Not modified,Built=2017/07/31 19:40:17 UTC,CalDue=2017jan01,Manufactured=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=113636,3AAB CRLF 3.2.11 RS-485 T ERMINATION 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. -
Page 18: Data Fifo Query
JDx QUICK START GUIDE 3.2.12 D FIFO Q UERY In an effort to support downstream DSP efforts, the JDx has a FIFO of up to 64 of the latest data points. As an alternative to streaming, the FIFO may be accessed to burst data out of the sensor without needing to access it in a real-time fashion to recover all data that it generates. -
Page 19: Bus Scan
JDx QUICK START GUIDE Example Response 001,F,F,FIFO flushed,8AFD CRLF 3.2.15 B This command will cause all devices on an RS-485 bus to respond in turn allowing you to identify which addresses are present on an unknown bus. While this will work with specific addresses, this command is intended to be a broadcast command. -
Page 20: Relative Zero
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 It is possible for Jewell to pre-load a relative zero into the device, please contact sales@jewellinstruments.com for details. -
Page 21: Appendix A: Warranty & Limitation Of Liability
In respect to 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.
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