Geokon 6180 User manual

©2021, GEOKON. All rights reserved.
Document Revision: Init | Release date: 04/05/21
Model 6180
Vertical In-Place
Inclinometer System
Instruction Manual

WARRANTY STATEMENT
GEOKON warrants its products to be free of defects in materials and workmanship,
under normal use and service for a period of 13 months from date of purchase. If the
unit should malfunction, it must be returned to the factory for evaluation, freight
prepaid. Upon examination by GEOKON, if the unit is found to be defective, it will be
repaired or replaced at no charge. However, the WARRANTY IS VOID if the unit shows
evidence of having been tampered with or shows evidence of being damaged as a
result of excessive corrosion or current, heat, moisture or vibration, improper specifi-
cation, misapplication, misuse or other operating conditions outside of GEOKON’s
control. Components that wear or are damaged by misuse are not warranted. This
includes fuses and batteries.
GEOKON manufactures scientific instruments whose misuse is potentially dangerous.
The instruments are intended to be installed and used only by qualified personnel.
There are no warranties except as stated herein. There are no other warranties,
expressed or implied, including but not limited to the implied warranties of merchant-
ability and of fitness for a particular purpose. GEOKON is not responsible for any
damages or losses caused to other equipment, whether direct, indirect, incidental,
special or consequential which the purchaser may experience as a result of the instal-
lation or use of the product. The buyer’s sole remedy for any breach of this agreement
by GEOKON or any breach of any warranty by GEOKON shall not exceed the purchase
price paid by the purchaser to GEOKON for the unit or units, or equipment directly
affected by such breach. Under no circumstances will GEOKON reimburse the
claimant for loss incurred in removing and/or reinstalling equipment.
Every precaution for accuracy has been taken in the preparation of manuals and/or
software, however, GEOKON neither assumes responsibility for any omissions or
errors that may appear nor assumes liability for any damages or losses that result
from the use of the products in accordance with the information contained in the
manual or software.
No part of this instruction manual may be reproduced, by any means, without the written consent of GEOKON. The
information contained herein is believed to be accurate and reliable. However, GEOKON assumes no responsibility
for errors, omissions or misinterpretation. The information herein is subject to change without notification.
The GEOKON® wordmark and logo are registered trademarks with the United States Patent and Trademark Office.

I
TABLE OF CONTENTS
1. INTRODUCTION............................................................................................................................................1
2. INSTALLATION..............................................................................................................................................2
2.1 PRELIMINARY TESTS ......................................................................................................................2
2.2 SAFETY CABLE.......................................................................................................................................2
2.3 SENSOR ORIENTATION .................................................................................................................3
2.4 SENSOR INSTALLATION ..............................................................................................................3
2.4.1 SUSPEND THE FIRST SENSOR ....................................................................................................3
2.4.2 CONNECT THE SECOND SENSOR TO THE FIRST SENSOR ............................................4
2.5 CONNECTING THE SUSPENSION BRACKET ..............................................................6
2.5.1 CONNECT THE CABLE ASSEMBLY TO THE BRACKET .....................................................6
2.5.2 CONNECT THE CABLE ASSEMBLY TO THE SENSOR STRING ......................................7
2.5.3 LOWER THE TOP-MOST SENSOR ..............................................................................................8
2.6 MODEL 8020-38 RS-485 TO TTL/USB CONVERTER............................................8
2.7 FOUR-PIN WATERPROOF CONNECTOR .........................................................................9
3. MODBUS RTU PROTOCOL .......................................................................................................... 10
3.1 INTRODUCTION TO MODBUS.............................................................................................. 10
3.2 MODBUS RTU OVERVIEW ....................................................................................................... 10
3.3 MODBUS TABLES ........................................................................................................................... 10
4. DATA REDUCTION ................................................................................................................................13
4.1 INCLINATION CALCULATION............................................................................................... 13
4.2 DEFLECTION CALCULATION ................................................................................................. 13
4.3 TEMPERATURE CORRECTION ............................................................................................. 13
4.4 ENVIRONMENTAL FACTORS ................................................................................................ 13
5. TROUBLESHOOTING .......................................................................................................................... 14
APPENDIX A. SPECIFICATIONS .................................................................................................. 15
A.1 PARTS LIST .......................................................................................................................................... 15
APPENDIX B. SAMPLE CALIBRATION SHEETS ....................................................... 18
APPENDIX C. MODBUS ADDRESSABLE SYSTEM ................................................ 20
C.1 MODBUS COMMUNICATIONS PARAMETERS..................................................... 20
C.2 ERROR CODES ................................................................................................................................... 20
APPENDIX D. CRBASIC PROGRAMMING........................................................................ 21
D.1 SAMPLE CR1000 PROGRAM ............................................................................................... 21
D.2 SAMPLE CR6 PROGRAM ......................................................................................................... 21

II
FIGURES
FIGURE 1: CABLE CONNECTION DETAIL ........................................................................2
FIGURE 2: CONNECTED CABLES .....................................................................................2
FIGURE 3: CONNECTING A SAFETY CABLE ....................................................................3
FIGURE 4: A & B DIRECTIONS ..........................................................................................3
FIGURE 5: SUPPORT SENSOR WITH ROD ......................................................................4
FIGURE 6: SUPPORT HOLES ............................................................................................4
FIGURE 7: PRE-INSERTED LOCKING PIN ........................................................................4
FIGURE 8: REMOVE THE LOCKING PIN ..........................................................................4
FIGURE 9: RETRACT THE SPRING SLEEVE ......................................................................5
FIGURE 10: CAPTURE THE BALL STUD ...........................................................................5
FIGURE 11: SEGMENTS CONNECTED .............................................................................5
FIGURE 12: CABLE CONNECTION DETAIL ......................................................................6
FIGURE 13: TIE-WRAPPED CABLE ...................................................................................6
FIGURE 14: ATTACH THE FIRST CABLE CLAMP .............................................................7
FIGURE 15: ATTACH THE SECOND CABLE CLAMP ........................................................7
FIGURE 16: ASSEMBLED SUSPENSION CABLE (EXAMPLE) .........................................7
FIGURE 17: MODEL 8020-38 TTL/USB TO RS-485 CONVERTER ...................................8
FIGURE 18: WIRING OF DATALOGGER WITHOUT BUILT-IN RS-485 CONVERSION ...8
FIGURE 19: WIRING OF DATALOGGER WITH RS-485 CONVERSION ...........................9
FIGURE 20: MALE WATERPROOF CONNECTOR ............................................................9
FIGURE 21: FEMALE WATERPROOF CONNECTOR ........................................................9
FIGURE 22: INSTALLATION EXAMPLE ..........................................................................13
FIGURE 23: 6180 IPI MEMS ADDRESSABLE VERTICAL ...............................................16
FIGURE 24: 6180T IPI MEMS ADDRESSABLE VERTICAL, TERMINAL ........................16
FIGURE 25: 6180-1 SUSPENSION CABLE ASSEMBLY .................................................16
FIGURE 26: 6180-2 SUSPENSION BRACKET ................................................................16
FIGURE 27: 6180-3 TOPSIDE READOUT CABLE/BARE LEADS, < 100FT ....................17
FIGURE 28: 6180-3V TOPSIDE READOUT CABLE/BARE LEADS, > 100FT ..................17
FIGURE 29: 6180-6 SAFETY CABLE ASSEMBLY ...........................................................17
FIGURE 30: SAMPLE MODEL 6180 CALIBRATION SHEET, SENSOR A ......................18
FIGURE 31: SAMPLE MODEL 6180 CALIBRATION SHEET, SENSOR B ......................18

III
TABLES
TABLE 1: FOUR-PIN WIRING CHART ............................................................................... 9
TABLE 2: REGISTER ADDRESSES AND FORMATS....................................................... 11
TABLE 3: DEVICE CONTROL ADDRESSES..................................................................... 11
TABLE 4: NON-VOLATILE MEMORY............................................................................... 11
TABLE 5: PREPROGRAMMED DEVICE INFORMATION ............................................... 12
TABLE 6: MODEL 6180 INCLINOMETER SPECIFICATIONS......................................... 15
TABLE 7: MODEL 6180 INCLINOMETER PARTS LIST.................................................. 15
TABLE 8: MODBUS COMMUNICATIONS PARAMETERS ............................................. 20
TABLE 9: ERROR CODES ................................................................................................. 20

IV
EQUATIONS
EQUATION 1: CORRECTED INCLINATION ANGLE.........................................................13
EQUATION 2: LATERAL DISPLACEMENT........................................................................13
EQUATION 3: OFFSET CALCULATION.............................................................................13

MODEL 6180 VERTICAL IN-PLACE INCLINOMETER SYSTEM | INTRODUCTION | 1
1. INTRODUCTION
The GEOKON Model 6180 Vertical In-Place Inclinometer (IPI) System enables
long-term monitoring of deformations in structures such as dams,
embankments, foundation walls, and similar applications. The basic principle of
operation uses MEMS accelerometers to measure static tilt at specified depths
in a casing installed in the structure being studied. The instrument is designed to
be installed in standard grooved inclinometer casing, which is installed in the
borehole. Monitoring by the instrument allows for very precise measurement of
changes in the borehole profile.
Each sensor is comprised of an addressable Micro-Electro-Mechanical Systems
(MEMS) device inside a sealed stainless steel housing. The device measures the
"A" and "B" axes of the borehole. Each sensor also contains a digital temperature
sensor for reading temperatures.
The sensors are mechanically joined with quick-connect ball joints, which allow
for unimpeded relative movement between sensors and accommodate any
spiraling of the casing. Electrically, sensors are connected to each other with
four-wire bus cable and molded waterproof connectors.
Each sensor is individually serialized and calibrated. A calibration sheet for each
sensor is provided, showing the relationship between sensor output and
inclination.
Data is collected by connecting the IPI string to a readout device (PC,
datalogger, SCADA system, etc.) via a customer-specified readout cable.

2| INSTALLATION | GEOKON
2. INSTALLATION
2.1 PRELIMINARY TESTS
Prior to installation, check the sensors for proper operation. Complete the
following steps:
1. Place the sensors in the correct order by referring to the labels on the
sensors and the provided paperwork.
2. Starting with the first sensor, connect the sensors by plugging the male
connector from the second sensor into the female connector from the first
sensor. Proceed in this manner until the full string is connected.
1:
FIGURE 1: Cable Connection Detail
Caution! When connecting the sensors, make sure to line up the
orientation dot on the outside of the male connector with the two
orientation dots on the outside of the female connector. This will ensure the
pins and receptacles on the interior of the connectors align correctly. Push
the connectors together until they are completely mated.
2:
FIGURE 2: Connected Cables
3. Connect the completed string to a Model 8020-38 converter, PC, or
datalogger (refer to Section 2.6).
4. Hold the first sensor in a vertical position and observe the reading. The tilt
sensor must be held steady while taking the reading. The observed reading
should be close to the factory vertical reading. Tilting the sensor in a
positive direction (A+ or B+, as marked on the sensor) should yield
increasing readings. Tilting the sensor in a negative direction (A- or B-)
should yield decreasing readings. The temperature indicated on the readout
should be close to ambient. Repeat this process with the remaining sensors.
5. Once the preliminary tests are complete, disconnect the string from the
readout device and disconnect the sensors from each other.
Should any of these preliminary tests fail, see Section 5 for
troubleshooting.
2.2 SAFETY CABLE
GEOKON strongly recommends attaching a safety cable to the bottom-most
(terminal) sensor, Model 6180T. This can be used to retrieve the assembly in the
event of an accident, and it also can be helpful when lowering the assembly into
the casing.
Model 6180-6 safety cable assemblies purchased from GEOKON consist of a
customer-specified length of aircraft cable (07-125SS316-E/M) with eye bolt and
hex nuts pre-attached for ease of installation, along with all hardware required to
anchor the string.

MODEL 6180 VERTICAL IN-PLACE INCLINOMETER SYSTEM | INSTALLATION | 3
To connect the safety cable to the terminal sensor, complete the following steps:
1. Fasten the upper end of the safety cable to a fixed object, or to something
too large to enter the casing, to avoid accidentally dropping the entire cable
into the casing.
2. Remove the two hex nuts from the eye bolt.
3. Insert the eye bolt through both connection holes on the terminal sensor.
4. Thread the two nuts back onto the bolt and tighten against one another
using two 5/16" crescent wrenches; this will secure the safety cable to the
terminal sensor.
The figure below shows a properly connected safety cable.
3:
FIGURE 3: Connecting a Safety Cable
5. Tie off the top end of the safety cable by attaching it to an appropriate
anchor point. Follow the procedure from Section 2.5.1 for proper installation
of the cable clamps.
2.3 SENSOR ORIENTATION
All wheel assemblies should be oriented in the same direction when installed in
the casing. The wheel assemblies are attached at the factory so the upper wheel
is facing the A+ direction of the sensor (as shown in the figure to the left). Axis
directions are also physically labeled on each sensor.
Point the A+ direction in the same direction as the anticipated movement, i.e.,
towards the excavation being monitored or downslope for slope evaluation
applications.
The MEMS device monitors both A and B directions. The B+ direction is 90
degrees clockwise from the A+ direction, as viewed from above.
2.4 SENSOR INSTALLATION
The first sensor to install is the Model 6180T terminal sensor, which includes two
sets of wheels.
2.4.1 SUSPEND THE FIRST SENSOR
1. Insert the 6180T sensor into the casing, making sure to orient the wheels
correctly for proper axis orientation (see Section 2.3), and with the male
cable connector facing up toward the top of the casing.
Safety Cable
Eye Bolt
Hex Nuts
Connection Holes
Connected
Safety Cable
4:
FIGURE 4: A & B Directions
A- Direction
B+ Direction A+ Direction
B- Direction

4| INSTALLATION | GEOKON
2. With the safety cable attached, lower the first sensor into the casing hole,
until the ¼" support holes are adjacent the top of the casing.
3. Suspend the sensor in place at the top of the casing by inserting a ¼"
diameter screwdriver or rod through the support hole on the side of the
sensor. Refer to the figures below and to the left.
5:
FIGURE 5: Holes for Safety Cable Eye Bolts vs Holes for Support Holes
FIGURE 6: Support Sensor with Rod 2.4.2 CONNECT THE SECOND SENSOR TO THE FIRST SENSOR
1. Each 6180 segment is supplied with a barbed locking pin pre-installed. 7:
FIGURE 7: Pre-inserted Locking Pin
2. Remove the locking pin by depressing the barb and pulling the ring at the
same time.
8:
FIGURE 8: Remove the Locking Pin
Holes for Safety Cable Eye Bolt
Support Holes
Support
using rod or
screwdriver
Barb
Ring
Locking Pin

MODEL 6180 VERTICAL IN-PLACE INCLINOMETER SYSTEM | INSTALLATION | 5
3. Retract the spring sleeve on the second sensor and mate the ball stud of the
first sensor to the receiver of the second sensor by connecting them
together using a lateral motion.
9:
FIGURE 9: Retract the Spring Sleeve
4. Capture the ball stud by releasing the spring sleeve (make sure the sleeve
returns to its initial position).
10:
FIGURE 10: Capture the Ball Stud
5. Reinsert the locking pin to prevent the sleeve from retracting while in use.
11:
FIGURE 11: Completed Connection
6. Plug the male connector of the first sensor’s signal cable into the female
connector of the second sensor’s signal cable.
Caution! When connecting the sensors, make sure to align the two
orientation dots on the outside of the female connector with the orientation
dot on the outside of the male connector. This will ensure the pins and
receptacles on the interior of the connectors align correctly. Push the male
and female connectors together until they are completely mated.

6| INSTALLATION | GEOKON
12:
FIGURE 12: Cable Connection Detail
Note: For additional security, tape the connectors together.
7. Using a provided tie wrap, secure the cable of the male connector to the
tube of the second sensor by feeding the tie wrap through the parallel slots,
around the cable, and back to itself; this will help provide strain relief for the
connectors. Trim any length of excess tie wrap. See the figure below.
13:
FIGURE 13: Tie-Wrapped Cable
8. Remove the screwdriver/rod from the first sensor and, with the safety cable
attached, lower the second sensor into the casing hole, until the ¼" support
holes are adjacent the top of the casing. Make sure to orient the A+
direction of each sensor correctly when inserting it into the casing.
9. Suspend the second sensor in place at the top of the casing by inserting a
¼" diameter screwdriver or rod through the the support hole on the side of
the sensor.
10. Repeat steps 2 - 9 above for each subsequent sensor.
11. Plug the male connector of the top-most sensor to the female connector of
the readout cable (6180-3-1, 6180-3-2, or 6180-3V). Connect the other end
of the readout cable to the readout device or data-logger.
2.5 CONNECTING THE SUSPENSION BRACKET
To ensure the string is installed to the correct depth, sum the sensor lengths and
subtract this value from the desired string depth (measured from the top of the
casing to the bottom of the string assembly); the resulting value is the
Suspension Cable Length.
Note: GEOKON suggests suspending the sensor string at least 150 mm (six
inches) above the bottom of the casing, to account for debris and settlement.
2.5.1 CONNECT THE CABLE ASSEMBLY TO THE BRACKET
1. Hook the supplied thimble through the bottom-side eyelet on the
suspension bracket (6180-2).
2. Feed the bare cable end of the suspension cable assembly (6180-1) through
the bottom-side eyelet on the suspension bracket.
Tie-wrap
Slot

MODEL 6180 VERTICAL IN-PLACE INCLINOMETER SYSTEM | INSTALLATION | 7
3. Pull the cable through the eyelet until the distance from the suspension
bracket support shoulder to the end of the suspension receiver is equal to
the previously calculated Suspension Cable Length.
4. Fold the "dead end" of the cable back onto the "live end", then secure one of
the supplied cable clamps onto the cable at a distance of approximately 3.5
inches from the bottom-side eyelet on the suspension bracket. (Install the
cable clamp nuts firmly, but not tighten them down yet).
5. Orient the cable clamp with the two ends of the U-bolt facing toward the
"live end" of the cable as shown below.
14:
FIGURE 14: Attach the First Cable Clamp
6. Seat the loop formed by the cable into the channel of the thimble.
7. Install a second cable clamp onto the cable at the base of the thimble (see
image below).
15:
FIGURE 15: Attach the Second Cable Clamp
8. Adjust the first cable clamp so the "turnback length" measures
approximately 3.25 inches.
9. Apply light tension to the cable to remove all slack. Tighten all four cable
clamp nuts to a torque specification of approximately 4.5 ft-lbs.
10. If desired, the third supplied cable clamp may be installed in between the
first and second cable clamps (make sure to tighten nuts to the previously
mentioned torque specification).
11. Trim the excess cable from the "dead end", leaving at least 3/8 inch of
length from the first cable clamp. Alternatively, wrap the end of the cable
with tape and then tape it to the main length of the suspension cable.
16:
FIGURE 16: Assembled Suspension Cable (Example)
2.5.2 CONNECT THE CABLE ASSEMBLY TO THE SENSOR STRING
The suspension cable assembly attaches to the sensor string similar to how the
sensors attach to each other. For illustrated steps refer to Section 2.4.2.
Dead End
Live End
U Bolt
Dead End
Live End
U Bolt
Second U bolt near the thimble First U bolt near the dead end
Turnback
Eyelet
Suspension Bracket
Cable Suspension Receiver
3.25 Inches Turnback Length
0.375 Inches
Dead End Live End
Cable Clamps
3.5 Inches

8| INSTALLATION | GEOKON
1. Remove the locking pin from the suspension receiver by depressing the
barb and pulling the ring at the same time.
2. Retract the spring sleeve on the suspension receiver and mate the ball stud
of the top-most sensor to the suspens0ion receiver by connecting them
together using a lateral motion.
3. Release the spring sleeve to secure the ball stud inside the sleeve.
4. Reinsert the locking pin to prevent the sleeve from retracting while in use.
2.5.3 LOWER THE TOP-MOST SENSOR
Lower the top-most sensor into the casing and position the suspension bracket
on top of the casing.
Important! Ensure the top rim of the casing is relatively square to properly seat
the suspension bracket.
Readings may be taken immediately after installation, however, GEOKON
recommends evaluating the data over a period of time to determine when the
string has sufficiently stabilized and when the zero readings should be
established.
2.6 MODEL 8020-38 RS-485 TO TTL/USB CONVERTER
GEOKON makes the Model 8020-38 Addressable Bus Converter for connecting
addressable strings to personal computers, readouts, dataloggers, and
programmable logic controllers. The converter acts as a bridge using the TTL or
USB protocols between readers and the GEOKON RS-485-enabled sensor strings.
For more information, please refer to the Model 8020-38 instruction manual.
17:
FIGURE 17: Model 8020-38 RS-485 to TTL/USB Converter
Note: The datalogger you use must have the appropriate port available.
If your datalogger does not have built-in RS-485 communications, connect
the wiring using the diagram to the left.
If your datalogger has built-in RS-485 communications, connect the wiring
using the diagram in the figure below.
18:
FIGURE 18: Wiring of Datalogger without
built-in RS-485 Conversion

MODEL 6180 VERTICAL IN-PLACE INCLINOMETER SYSTEM | INSTALLATION | 9
19:
FIGURE 19: Wiring of Datalogger with built-in RS-485 Conversion
2.7 FOUR-PIN WATERPROOF CONNECTOR
The pinouts for the four-pin male and female connectors are shown below; the
function of each wire is detailed in Table 1 below.
20:
FIGURE 20: Male Waterproof Connector
21:
FIGURE 21: Female Waterproof Connector
1:
TABLE 1: Four-Pin Wiring Chart
Pin Wire Color Function
1Red Power
2 Black Ground
3 White RS-485+ Data High
4 Green RS-485- Data Low
Pin 1
Pin 2
Pin 3 Pin 4
Pin 1
Pin 4
Pin 3 Pin 2

10 | MODBUS RTU PROTOCOL | GEOKON
3. MODBUS RTU PROTOCOL
3.1 INTRODUCTION TO MODBUS
Model 6180 inclinometers use the industry standard Modbus Remote Terminal
Unit (RTU) protocol to communicate with the chosen readout method. As the
name suggests, Modbus was designed to work on what is known as a bus
network, meaning that every device receives every message that passes across
the network. Model 6180 inclinometers use the RS-485 electrical interface
because of its prevalence, simplicity, and success as a robust, industrial physical
layer.
More information about Modbus can be found at the following website:
http://www.modbus.org/specs.php
3.2 MODBUS RTU OVERVIEW
The Modbus RTU protocol uses packets (messages made up of multiple
sections) to communicate and transfer data between devices on the network.
The general format of these packets is as follows:
1. Modbus Address (one byte) – The address of the specific device on the bus.
(Labeled on the sensors as #1, #2, #3, etc.)
2. Function Code (one byte) – The action to be carried out by the slave device.
3. Data (multi-byte) – The payload of the function code being sent.
4. Cyclic Redundancy Check or CRC (two bytes): A 16-bit data integrity check
calculated over the other bytes in the packet.
3.3 MODBUS TABLES
The most recent sensor readings are stored in memory registers, read using a
Modbus command. Angle and temperature readings are available in processed
or precursor formats. Register addresses and formats are described in Table 2.
Note: GEOKON stores the gauge factor and offsets in the sensor during the
factory calibration process. Therefore, the outputs of the A- and B- axes are
both corrected values.
Table 3 shows device control addresses. Any non-zero value written to the
trigger address initiates a measurement cycle, updating the angle and
temperature measurement registers. Any anomalies detected during the most
recent measurement cycle produce a non-zero error code. Refer to Appendix C
for an explanation of these codes.
The flash password prevents unintended writes to the nonvolatile memory in
Table 4 and the preprogrammed device information in Table 5. Contact GEOKON
for instructions.

MODEL 6180 VERTICAL IN-PLACE INCLINOMETER SYSTEM | MODBUS RTU PROTOCOL | 11
2:
TABLE 2: Register Addresses and Formats
3:
TABLE 3: Device Control Addresses
4:
TABLE 4: Non-Volatile Memory
5:
Register Address Byte Word Parameter Units Type Access
0x100 0LSW
A-Axis degrees float
RO
1
0x101 2MSW
3
0x102 4LSW
B-Axis degrees float
5
0x103 6MSW
7
0x106 12 LSW
Temperature °Cfloat
13
0x107 14 MSW
15
0x108 16 LSW Uncorrected
A-Axis degrees float
17
0x109 18 MSW
19
0x10A 20 LSW Uncorrected
B-Axis degrees float
21
0x10B 22 MSW
23
0x10E 28 LSW Thermistor ADC N/A uint16
29
0x117 46 Error Code N/A uint16
47
Register Address Byte Word Parameter Units Type Access
0x118 48 Trigger N/A uint16
RW
49
0x119 50 LSW
Password N/A uint32
51
0x11A 52 MSW
53
0x11B 54 Measure Cycle N/A uint16
55
Register Address Byte Word Parameter Units Type Access
0x200 0Drop Address N/A uint16
RO
1
0x201 2
Sensor Type N/A string
3
0x202 4
5
0x203 6
7
0x204 8
9
0x205 10
11
0x206 12
13
0x207 14
15
0x208 16
17
0x209 18 LSW
Serial Number N/A uint32
19
0x20A 20 MSW
21
0x20B 22 Software Version N/A uint16
23
0x20C 24 Hardware Version N/A uint16
25

12 | MODBUS RTU PROTOCOL | GEOKON
TABLE 5: Preprogrammed Device Information
Register Address Byte Word Parameter Units Type Access
0x20D 26 LSW
A Offset degrees float
RO
27
0x20E 28 MSW
29
0x20F 30 LSW
B Offset degrees float
31
0x210 32 MSW
33
0x213 38 LSW
AGaugeFactor degrees float
39
0x214 40 MSW
41
0x215 42 LSW
BGaugeFactor degrees float
43
0x216 44 MSW
45