Jewell Instruments D701 Operating Manual

B-03-1006, Rev. K

Model D700 Digital Floor Mount Tiltmeter

850 Perimeter Road Manchester, NH 03103 USA Tel (603) 669-6400 Fax (603) 622-2690 sales@jewellinstruments.com www.jewellinstruments.com

B-03-1006, Rev. K

TABLE OF CONTENTS

1.0 Introduction ........................................................................................................................................... 1

2.0 Technical Highlights ............................................................................................................................. 3

3.0 Specifications ......................................................................................................................................... 3

4.0 Digital Output Features and Wiring ................................................................................................... 4

4.1 RS232 Output ...................................................................................................................................................... 4

4.2 RS485 (RS422) Output ........................................................................................................................................ 4

4.3 Using the Test Cable ................................................................................................................................ ........... 4

5.0 Installation ............................................................................................................................................. 4

5.1 Initial Check-Out Procedures ............................................................................................................................. 4

5.2 Installing Your Tiltmeter ................................................................................................................................... 10

6.0 Grounding and Transient Protection ................................................................................................ 10

7.0 Communicating with the Model D711 Tiltmeter ............................................................................. 11

7.1 Basic Requirements and Settings ...................................................................................................................... 11

7.2 Firmware Command Format ............................................................................................................................ 11

7.3 Firmware Command Summary ......................................................................................................................... 12

7.4 Sample Data Using the XY Command ............................................................................................................... 13

7.5 Recording Data in Internal Memory or on a PC; Data File Sizes .................................................................... 15

7.6 Switching between RS232 and RS485 (RS422) Output ..................................................................................... 15

8.0 Maintenance and Troubleshooting .................................................................................................... 15

8.1 Routine Maintenance ........................................................................................................................................ 15

8.2 Determining the Cause of Malfunctions ............................................................................................................ 16

Appendix A: Custom Specifications for Your Digital Tiltmeter ........................................................... 18

1.0 RS232 Wiring and Connector Table ................................................................................................................. 18

2.0 RS485 (RS422) Wiring and Connector Table ................................................................................................... 19

Appendix B: Guidelines for Installing Surface Mount Tiltmeters ........................................................ 20

Appendix C: Firmware Commands ......................................................................................................... 21

Appendix E: Warranty and Limitation of Liability .......................................................................... 35

Appendix F: Revision Record ............................................................................................................. 36

B-03-1006, Rev. K

TABLE OF FIGURES

Figure 1: Model D711 Digital Floor Mount Tiltmeter (Biaxial) ............................................................. 1

Figure 2: Tiltmeter Dimensions ............................................................................................................... 2

Figure 3: Floor Mount Tiltmeter Sign Convention .................................................................................. 6

Figure 4: Model D711 Tiltmeter Cable Wiring ....................................................................................... 7

Figure 5: RS232 Test Cable (Part No. 89063) for Use with Model D711 Tiltmeter ............................... 8

Figure 6: RS485 (RS422) Test Cable (Par No. 89062) for Use with Model D711 Tiltmeter ................. 9

Figure 7: Layout of the IRIS Printed Circuit Assembly inside the Tiltmeter

Showing Connector Locations ............................................................................................... 17

Figure A1: Face View of Female DB9 Connector with Pin Assignments ............................................... 19

Figure B1: Installing Model D7ll Digital Floor Mount Tiltmeter ............................................................ 20

B-03-1006, Rev. K 1

1.0 Introduction

The D711 is a precision biaxial digital tiltmeter packaged in a weatherproof housing (Figure 1). It was formerly called the D711-2(4X). The high-gain version, Model D711-A, has the greatest sensitivity and an angular range of ±0.5 degree. The mid-range version, Model D711-B, has a much greater angular range (±5 degrees), but is less sensitive. Specifications for each version are in Section 3. Some typical applications include precise alignment of telescopes, antennae, and air frames; monitoring of structures and foundations; monitoring of volcanoes, and all jobs that call for precision measurements under demanding operating conditions.

The Tiltmeter is available with either RS232 or RS485 digital output. RS232 is typically limited to cable lengths less than 15 meters (49.2 feet). The RS485 output of the Tiltmeter, which is functionally equivalent to RS422 output, can drive cable lengths greater than 1000 meter (3,231 feet). Your Tiltmeter was shipped with the output protocol shown on the title page, and in Appendix A. To switch between RS232 and RS485, refer to section 7.6 . RS485 multi-drop networks are not currently supported.

Model D711 bolts or clamps to any surface and can be used in areas of heavy traffic or vibration. The

12.7-mm (0.5-inch) holes in its three corners (Figure 2) fit over threaded stainless steel studs, provided with each order. The tiltmeter is double-nutted to the studs after they are anchored in the mounting surface (Appendix B).

In addition to this user's manual, the following accessories were shipped with your Tiltmeter. Please verify that all are present: Quantity Test Cable (RS232 or RS485 Output, P/N 89063 or 89062) 1 Universal Power Transformer for 110 or 220 VAC (P/N 00254-02) 1 Mounting Stud Assembly (P/N 84410) 1 Mating 10-Socket Female Connector (P/N 62401) 1 Acrylic Bubble Level (P/N 00299) 1

Figure 1: Model D711 Digital Floor Mount Tiltmeter (Biaxial)

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Figure 2: Tiltmeter Dimensions

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2.0 Technical Highlights

Model D711 includes the following important features:

• Tilt angle is measured with an electrolytic sensor, similar to a spirit level.

• All electronics reside on a single internal printed-circuit board.

• All resistors are premium quality, 1% tolerance, metal-film type.

• The tiltmeter comes with a powerful set of user-selectable firmware commands.

• All tiltmeters are hand-assembled, calibrated, and tested at our plant under stringent quality

control standards.

• Jewell maintains complete specifications and test records of every tiltmeter built.

Your tiltmeter contains two electrolytic level sensors (one for each tilt axis) that produce changes in resistance in response to a rotation of the sensor. A voltage divider network senses the resistance change. The electronics then sample and convert the sensor outputs into tilt angles using factory calibration data stored in nonvolatile memory. The sensors in your tiltmeter measure tilts in two orthogonal vertical planes, X and Y (Figure 3). The vector sum of the outputs of both channels yields the direction and magnitude of rotation with reference to the vertical gravity vector. Please contact us should you require technical assistance when you process your tiltmeter measurements.

3.0 Specifications

General specifications are listed below. Appendix A contains custom specifications for your equipment.

Model D711-A

High-Gain Version

Model D711-B

Mid-Range Version

ANGULAR RANGE

±0.5 degree*

±5 degrees

RESOLUTION

1 radian

10 radians

REPEATABILITY

< 4 radians (static)

10 radians (static)

LINEARITY

0.4% of full span

0.1% of full span

TIME CONSTANT

0.15 second

TEMPERATURE COEF.

Zero, Kz = ±3.5 µradians/°C typical; Span, Ks = 0.02%/°C typical

DIGITAL OUTPUT

Two orthogonal tilt angles plus one temperature; RS232 or RS485 (RS422), transmit and receive Baud rate: 9600 (default), 19200, 28800, 57600, 115200, 230400 Formats: NMEA XDR, Trimble proprietary, Ashtech compatible, Simple (x, y, temperature, serial no.)

OUTPUT DATA RATE

User-selectable from 10 samples/second to 1 sample/24 hours

RS485 TERMINATION

Cable length  12m: No termination resistors; Cable length > 12m: 100-130 termination resistors

POWER REQ'TS

7 to 28 VDC @ 27 mA, 250 mV peak-to-peak ripple maximum, reverse polarity protected

ENVIRONMENTAL

−25° to +70° C operation, −30° to +100° C storage. Rated NEMA 4X (IP65) for continuous operation at 100% humidity. Withstands exposure to rainfall and spray. Not submersible.

MOUNTING

Three 0.5-inch (12.7 mm) mounting holes. Tiltmeter fastens to stainless steel mounting studs (included).

MATERIALS

Anodized and painted aluminum

CABLE

10 ft (3m) multiconductor cable + overall shield, PVC jacket, connectors included

SIZE & WEIGHT

6 x 6 x 4 inches (152 x 152 x 102 mm), 3 lbs. (1.4 kg)

* 1 degree = 3600 arc seconds = 17453 radians (microradians)

B-03-1006, Rev. K 4

4.0 Digital Output Features and Wiring

Your tiltmeter was set at the factory to have either RS232 or RS485 (RS4252) digital output. The setting for your tiltmeter is indicated on the title page and in appendix A. Firmware commands are summarized in Section 7 and in Appendix C.

4.1 RS232 Output

RS232 output is designed for signal transmission over cable lengths less that approximately 15 meters. Figure 4 and Appendix A list the RS232 pin assignments in the tiltmeter cable. Figure 5 shows the wiring of the RS232 test cable.

4.2 RS485 (RS422) Output

RS485 and RS422 outputs are designed for signal transmission over long cables. These two output protocols are equivalent in the Model D711 and will drive cables longer than 1,000 meters. Each tiltmeter with RS485 (RS422) output requires its own serial port. It is not currently possible to operate a series of tiltmeters in "multidrop" fashion on a single 4-wire cable. Figure 4 and Appendix A show the wiring and pin assignments for RS485 (RS422) output. Figure 6 shows the wiring of the RS485 test cable. Wiring of the DB9 connector at one end of the test cable corresponds to the National Instruments 8-port RS485 card for the PCI databus, part no. 777641-08 (2004).

When cable length exceeds 12 meters, we recommend that termination resistors be used at the ends of the transmit, and receive lines to dampen possible reflections and maintain good signal quality. Recommended resistor values are between 100 and 130 Ohms. Connect one resistor between the computer's Rx+ and Rx- inputs (same as the tiltmeters Tx+ and Tx- wires), at the computer end of the cable. Similarly, connect one resistor between the tiltmeter's Rx+ and RX- inputs at the tiltmeter end of the cable. Refer to Figure 6 for pin numbering.

4.3 Using the Test Cable

The test cable shipped with your tiltmeter is wired for the same output protocol as your tiltmeter. The RS232 test cable is designed to connect the tiltmeter to the RS232 serial port of a personal computer. The RS485 (RS422) test cable is designed to connect the tiltmeter to an RS485 (RS422) serial port. Typically, this port will be on an expansion card or PCMCIA card in the computer.

The test cable includes a power jack (connector) that mates with the output jack of the power transformer shipped with the tiltmeter. When the transformer is plugged into a 110 or 220 VAC wall socket, it supplies 12 Volts DC to the tiltmeter. The standard transformer shipped with the tiltmeter accepts 100 to 240 Volts AC at 50-60 Hz. For safe operation, read the power rating printed on the transformer and verify that it conforms to your wall socket power before use!

5.0 Installation

5.1 Initial Check-Out Procedures

Before installing your tiltmeter, verify that it is functioning properly by following the steps below. Refer to the firmware command summary in Section 7.3.

B-03-1006, Rev. K 5

Using HyperTerminal (Windows 95 and later)

1. Apply power and attach the tiltmeter to a PC according to wire color and pin assignment code in Appendix A. Or, use the test cable (Figure 5 or 6) and power transformer supplied with your tiltmeter.

2. Open HyperTerminal, selecting the proper COM port and baud rate (the default baud rate for your tiltmeter is 9600).

3. Type the command “*9900XYC0” without typing the quotation marks (note that the tiltmeter is case sensitive).

4. If properly attached, the tiltmeter will now start outputting data through the serial port at a rate of 10 readings per second, and the data will be displayed in HyperTerminal.

5. Tilt the unit in the +X and then the +Y direction (Figure 3). Next tilt it in the –X and –Y directions. Verify that the tilt values move through the full angular range (Section 3), and that the sign (polarity) of the output changes on opposite sides of null.

6. Type the command “*9900XYC-OFF” without typing the quotation marks to stop the output.

7. Your Model D711 tiltmeter is now ready for installation.