Laser Technology MapStar TruAngle User manual

© LTI 2014 MapStar TruAngle 0144849
Laser Technology, Inc.
MapStar®TruAngle®
User’s Manual

LTI MapStarTruAngle
User’s Manual 3rd Edition
Part Number 0144849
Copyright Notice:
Information in this document is subject to change without notice and does not represent
a commitment on the part of Laser Technology, Inc. No part of this manual may be reproduced
in any form or by any means, electronic or mechanical, including photocopying, recording, or
information storage and retrieval systems, for any purpose other than the purchaser’s
personal use, without the express written consent of Laser Technology, Inc.
Copyright (c)[2010
- 2014] Laser Technology, Inc. All Rights Reserved.
Unauthorized duplication, in whole or in part, is strictly prohibited.
First Edition: December 2010
Second Edition: January 2012
Third Edition: November 2014
Trademarks:
MapStar, TruAngle, TruPulse, TruSpeed, Impulse, UltraLyte and Criterion are registered trademarks of
Laser Technology, Inc. All other trademarks are the property of their respective owner.
Patents:
This product is covered by pending patent applications and
the following issued patent: 5,859,693
How to Contact LTI: Street Address: 6912 S. Quentin Street
Centennial, CO 80112 USA
Phone: [phone]
1-800-790-7364 (USA and Canada)
Fax: [phone]
Web Site: www.lasertech.com
Email: [e-mail]

LTI MapStar TruAngle User’s Manual 3rd Edition
Table of Contents
Page 1
Table of Contents
Precautions ........................................................................................................................ 2
Section #1 - Introducing the MapStar TruAngle ............................................................. 2
Basic Package ............................................................................................................ 3
Accessories ................................................................................................................ 3
Section #2 - Quick Start .................................................................................................... 3
Section #3 - Using the TruAngle ...................................................................................... 4
Loading the Batteries .................................................................................................. 4
Battery Indicator .................................................................................................. 4
Attaching the Side Brackets and the Laser .................................................................... 5
Connecting the Cables ................................................................................................ 6
Cable Crimp ......................................................................................................... 6
Leveling the TruAngle ................................................................................................. 6
Fine Adjust and Friction Lock ....................................................................................... 7
Button Names and Functions ....................................................................................... 7
Power ON the TruAngle ........................................................................................ 7
Extend the Display Segment Test .......................................................................... 8
Power OFF the TruAngle ....................................................................................... 8
Display the Firmware Version Number .................................................................... 8
Turn the LCD Backlight On or Off ........................................................................... 8
Indexing the Encoder .................................................................................................. 9
Zeroing the Unit ......................................................................................................... 9
Entering A Non-Zero Backsight .................................................................................... 9
Removing the Non-Zero Backsight Value ................................................................ 10
Taking a Measurement ................................................................................................ 10
Error Codes .......................................................................................................... 10
Section #4 - Managing Serial Data ................................................................................... 11
NMEA Compliance ...................................................................................................... 11
Laser Settings ............................................................................................................ 11
Remote Triggering ...................................................................................................... 11
Format Parameters ..................................................................................................... 12
Serial Ports Pin-out Assignments .................................................................................. 12
Serial Commands ........................................................................................................ 12
Serial Requests ..................................................................................................... 12
Serial Commands .................................................................................................. 13
TruPulse Series and TruSpeed Sx Only ................................................................... 14
Error Messages ..................................................................................................... 15
Section #5 - Caring for the TruAngle ............................................................................... 16
Section #6 - Troubleshooting & Tips ............................................................................... 17
Section #7 - Specifications ............................................................................................... 18
Section #8 - LTI Limited Warranty ................................................................................... 19
Index ................................................................................................................................... 20

LTI MapStar TruAngle User’s Manual 3rd Edition
Precautions
Page 2
Precautions
Do not expose to extreme temperatures.
TruAngle components are rated for a operating temperature range of -22to 122F (-30to 50C).
Storage temperature range: -40to 176F (-40to 80C).
Do not expose to severe mechanical shock.
To do so may damage the TruAngle’s encoder or associated electronics.
See the required procedure for indexing the encoder (Page 9).
Do not expose to excessive moisture or dust.
The TruAngle is rated IP54 - water & dust resistant. See Page 16 for
information about the care and maintenance of the TruAngle.
Section #1 - Introducing the MapStar TruAngle
Congratulations on the purchase of your LTI MapStar TruAngle angle encoder. The TruAngle calculates a
turned horizontal angle that can be referenced to any desired point or direction. It works in conjunction with all
our laser rangefinders that have an inclinometer for complete 3D position measurements with
X, Y and Z coordinates. The modular design allows you to pivot the laser a full 90up or down while
maintaining the rotary encoder level, providing the greatest possible accuracy and range of motion.
One of the major advantages of the TruAngle is that it is not affected by local magnetic interference.
There are so many applications, like urban environments for example, where you may need to position
objects, but can not use an electronic compass because your surroundings could compromise your accuracy.
Features of the TruAngle:
• Simple 2-button interface
• Friction Lock Mechanism
• Bubble Level
•LCD
• Backlight
• Serial Interface with Auto Download from laser to data collector
Figure #1
Top View Right Side View
1. Bubble Level
2. Serial Ports
3. Threaded Insert
4. Tripod Mount
5. Fine Adjust
6. Friction Lock
7. Buttons
8. LCD
9. Battery Door

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #2 - Quick Start
Page 3
Basic Package
MapStar TruAngle
Laser Cable
Download Cable
Side Brackets (1 set):
• Short (Impulse / TruPulse 200 / TruPulse 360)
• Short and Laser Mounting Bracket (TruSpeed Sx / TruPulse 200X / TruPulse 360R)
•Tall(UltraLyte)
2 AA batteries
User's Manual
Padded shipping box
Accessories
Laser mounting brackets
Tripod / Staff
Tribrach & Tribrach adapter
Mounting hardware
Serial data cable (remote trigger option)
Carrying case
Software solutions
Data Collectors
Section #2 - Quick Start
1. Install the batteries (Page 4).
2. Mount side brackets, laser, tripod and then attach
cables (Pages 5 - 6).
3. Use the bubble level to level the unit (Page 6).
4. Long press the ON button to power on the unit (Page 7).
5. Index the encoder (Page 9).
6. Zero the unit when “0.00” is flashing by pressing the OK button
or firing the laser. When the TruAngle is rotated, the display not
flash and will update with angle measurements.
7. Fire the laser to take an angle measurement. Laser and angle
measurement data is automatically downloaded through the
DATA serial port.
8. When finished, long press both buttons to power off the
TruAngle.
To learn more about any of the items listed above, please contact LTI,
LTI Sales Representative or Authorized Dealer.
Figure #2

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #3 - Using the TruAngle
Page 4
Section #3 - Using the TruAngle
Loading the Batteries
Two AA batteries are required to power the TruAngle.
The Battery Door is located on the left side of the TruAngle.
1. Remove the Battery Door by turning the screw counter-clockwise.
Note that Battery Doors tabbed edge serves as the hinge.
2. Insert the two batteries as shown in the figure.
3. Replace the Battery Door by inserting the tabbed edge of the door into the slot.
4. Secure the Battery Door by turning the screw clockwise.
Figure #3
Battery Indicator
Use a flat head screwdriver or coin to remove or secure the battery door.
The TruAngle continuously monitors
its power source. LTI has defined the
acceptable battery voltage range to
guarantee correct operation.
The battery voltage icon is located in
the lower right corner of the LCD.
When the battery voltage becomes
too low, the unit will automatically
power off. No indications.
Appearance
of the
Battery Icon Explanation
2 segments and battery outline lighted.
Approximately 8 hours of use remain.
1 segment and battery outline lighted.
Approximately 5 hours of use remain.
Battery outline lighted.
Approximately 2 hours of use remain.

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #3 - Using the TruAngle
Page 5
Attaching the Side Brackets and the Laser
1. Attach the laser mounting bracket to the laser.
2. Attach right and left side brackets to the TruAngle.
• The short side brackets are designed for use with the Impulse and the TruPulse.
• The tall side brackets are designed for use with the UltraLyte
3. Attach the laser mounting bracket to the side bracket. The side bracket should be secure,
but should not be over tightened.
• The required laser mounting bracket depends upon which laser you are using (Impulse,
TruPulse 200, TruPulse 200X, TruPulse 360, TruPulse 360R, TruSpeed Sx or UltraLyte).
Please contact LTI if you need assistance.
• When attaching the laser to the side brackets, do not over-extend the side brackets.
Impulse TruPulse 200 / TruPulse 360
TruSpeed Sx / TruPulse 200X / TruPulse 360R UltraLyte
Figure #4


LTI MapStar TruAngle User’s Manual 3rd Edition
Section #3 - Using the TruAngle
Page 6
Connecting the Cables
• Connect either end of the supplied laser data cable to
the laser’s serial port and the other end to the
TruAngle’s serial port labeled “LASER”.
• Connect one end of the download cable to the data
collector and the other end to the TruAngle’s serial port
labeled “DATA”.
Cable Crimp
As Figure #6 shows, the side bracket design includes a cable
crimp. You can use the cable crimp to hold the cables and keep
them from interfering with your work.
Leveling the TruAngle
The bubble level is used to level the TruAngle.
1. Look at the position of the bubble within the bubble
level. When the bubble is centered inside the circle, the
TruAngle is level.
2. To align the bubble within the circle, adjust the tribach
or tripod the TruAngle is mounted on.
Looking at Figure #7, the yellow dot represents the
bubble. [A] shows that the TruAngle is not level. [B]
shows that the TruAngle is level.
Figure #5
Figure #6
Figure #7
[A] [B]

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #3 - Using the TruAngle
Page 7
Fine Adjust and Friction Lock
• The Fine Adjust wheel lets you precisely control the encoder’s rotation. Movement of the wheel results in
small angle update measurements. The Fine Adjust ratio is 66:1.
• Tightening the Friction Lock keeps the encoder from rotating by adding friction to the base plate and to
the brake shoe which is attached to the chassis. Adjust as needed.
Button Names and Functions
Power ON the TruAngle
To power on the TruAngle, long press the ON button. Briefly, the LCD should look like Figure #8 and
the backlight will also be on. Next the LCD should look like Figure #9, prompting you to index the
encoder (Page 9).
Button Function
Figure #7
ON Long press powers on the TruAngle.
Shows the Display Test at power on until the
button is released (Page 8).
BL When the TruAngle is already powered on, long
press to turn on / off the backlight.
OK Short press to accept orientation and reference
the TruAngle at the value displayed.
ZERO Long press to activate the Zero Mode.
BS Short press to activate the Backsight Mode.
Press and hold both buttons until the TruAngle
powers off.
This manual simplifies the button names to relate to current function
instead of matching the TruAngle’s label. For example, instead of
“Press
the ON BL OK button to activate the backlight”
, this manual would state
“Press the BL button to activate the backlight” .
Figure #8 Figure #9

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #3 - Using the TruAngle
Page 8
Extend the Display Segment Test
Extending the Display Segment Test allows you to verify that all display indicators are
working properly.
1. Press and hold the ON button. The LCD should look like Figure #8 (Page 7) and the Backlight
should also be on.
2. Verify all display segments are lit.
3. Release the ON button. Upon releasing the ON button, the LCD should look like Figure #9 (Page 7).
Power OFF the TruAngle
To power off the TruAngle, long press both buttons simultaneously.
Display the Firmware Version Number
The firmware version number provides
manufacturing information about your
TruAngle. It can only be viewed at power on.
1. Starting with the TruAngle powered off,
long press both buttons. As an example,
Figure #10 shows the firmware version
number 1.14.
Note: Your TruAngle may display a different
firmware version number.
2. Upon release of the buttons, the LCD should
look like Figure #9, prompting you to index
the encoder (Page 9).
For future reference, make note here of the
firmware version number: __________.
Turn the LCD Backlight On or Off
When working in low-light conditions, you may find it easier to read the display screen if the LCD backlight is
toggled on. Long press the BL button at anytime to toggle the LCD backlight on or off.
• To help save its batteries, the TruAngle has a factory-defined power
off interval. The instrument will automatically power off if there is no
activity for a period of 60 minutes. Instrument activity includes
button presses and measurements.
• The power off interval may be changed using the Time Out Interval
serial command (Page 13).
To conserve battery power, you should only use the backlight when necessary.
Figure #10

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #3 - Using the TruAngle
Page 9
Indexing the Encoder
Each time the TruAngle is powered on, the LCD will display “ind” (see Figure #9 on Page 7) prompting you to
index the encoder.
1. Rotate the TruAngle clockwise or counter clockwise one complete rotation (360).
2. Once the index has been found, the 0.00LCD characters will flash.
Zeroing the Unit
Once the encoder is indexed, the 0.00LCD characters will flash to prompt you to zero the unit.
1. Short press the OK button or fire the laser. Firing the laser downloads a serial data string to zero the unit.
2. The 0.00LCD characters will be displayed steady instead of flashing. Angle measurements and the
display will update as the unit is rotated.
Entering A Non-Zero Backsight
Shooting a BackSight is the process of pairing a reference angle, or BackSight angle, with a selected direction,
and must be done upon every change of station. The default is to Zero your backsight angle while this routine
allows you to enter a non-zero backsight value.
1. Power on the TruAngle, index the encoder, and then short press the OK button to enter the Measurement
Mode.
2. Short press the BS button to activate the Backsight Mode and start updating the display. The display
flashes during this process.
3. Rotate the TruAngle until the desired Backsight value is displayed. Use the Fine Adjust wheel to assist in
displaying the correct value. Note that some hundredths values will not display - simply stop at the nearest
value.
4. Short press the BS button to freeze or lock the number in the display. The number will remain solid and will
not update if the TruAngle is turned.
5. Rotate the TruAngle until the instrument is pointing in the desired direction.
6. Press the OK button or fire the laser on the target to accept the measurement. The display & backlight will
flash 3 times, indicating the new backsight value has been set. The display will be steady instead of
flashing. The unit is ready for the next angle measurement.
As you are rotating the TruAngle, the index may be found before the
unit has been rotated the complete 360This is not a problem and will
not change the calibration.
At this point, if you want to change the backsight value, just short press
the BS button. The display will be flashing, prompting you to enter the
new backsight value.

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #3 - Using the TruAngle
Page 10
Removing the Non-Zero Backsight Value
There are two ways to remove the Backsight value:
• Long press of the ZERO/BS button. This will clear the Backsight value and return the unit to
the zeroing mode. The “0.00” would begin to flash, indicating the unit is ready to be zeroed.
• Power the unit off and then power the unit on to set the zero.
Taking a Measurement
To measure an angle after zeroing the unit or setting a non-zero backsight:
1. Rotate the TruAngle until the instrument is pointing in the desired direction.
2. Fire the laser.
• When laser is fired and a measurement is recorded, the TruAngle will also record the current angle
measurement and display that angle measurement on the LCD. The measurement display and
backlight will flash three times. Then the angle measurement will display steady.
• The flash indicates the measurements are being downloaded through the data serial port
automatically.
• The TruAngle is ready for a new angle measurement.
3. Repeat steps 1 and 2 for each new measurement.
Error Codes
The error code listed below and shown in Figure #11 may
be displayed on the LCD:
• Err 2: Memory Checksum Failure. If you see this
code, try cycling the power OFF and ON, and then
repeat the measurement. If the error persists,
please contact Laser Technology, Inc. for
assistance.
Additional error codes (messages) may be output through the serial
port. See Page 15 for more information.
Figure #11

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #4 - Managing Serial Data
Page 11
Section #4 - Managing Serial Data
The TruAngle's two serial ports are used to communicate
with external devices. The one labeled LASER to an LTI
laser product and the one labeled DATA to a data collector
or PC. In normal operation, the laser’s Fire button is pressed
and data is automatically downloaded to the TruAngle. It
then fires, inserts the angle value into the data string and
automatically sends it out the DATA port. In addition,
commands can be sent from the data collector/PC to the
TruAngle or laser; such as parameter change commands
(Page 13) and a remote trigger command to Fire the laser
(see below). Figure #12 shows the data flow.
The cables, data collectors, and software needed for remote
operations are available from LTI or an Authorized Dealer.
NMEA Compliance
The TruAngle uses the LTI CR400 data format follows the guidelines of the NMEA 0183 Standard for
Interfacing Marine Electronic Navigational Devices, Revision 2.0:
• NMEA 0183 provides for both standard and proprietary data formats. Since none of the standard
formats are useful for the data transferred from the Impulse, special proprietary formats are used.
Rules described in the NMEA standard governing general message structure, leading and trailing
characters, numeric values, delimiting character, checksums, maximum line length, data rate, and bit
format are followed exactly.
• As required by NMEA 0183, the CR400-format does not respond to unrecognized header formats,
malformed messages, or messages with invalid checksums.
Laser Settings
•Impulse 200 and 200 LR: Select the CR400 message format and the Auto Download option.
The Impulse will not communicate with the TruAngle if the IP200 download format is active.
•TruPulse Series: The CR400 message format with Auto Download is only option offered
in the unit. No settings are necessary.
•TruSpeed Sx: Select the CR400 message format. The TruSpeed Sx will not communicate with
the TruAngle if the TruSpeed download format is active.
•UltraLyte 200 and 200 LR: Select the CR400 message format. The UltraLyte will not
communicate with the TruAngle if the UL200 download format is active.
Remote Triggering
It is possible to remotely trigger the TruAngle by using an external computer, data collector, or switch closure.
Remote triggering uses an open collector closure to ground or an active low TTL or RS232 level signal to the
'trigger' pin on the serial connector. It requires a special order download cable that connects the remote trigger
signal from the encoder to the 'RTS' output signal of a computer's serial port.
When using a serial cable with a remote trigger connection hard-wired, care must be taken to control the state
of the RTS signal from the host computer. Often times the default state of the RTS signal will be low, causing
an inadvertent trigger. Since the remote trigger signal is treated the same as a button press on the TruAngle,
holding the signal low is identical to holding down a button, which prevents a response to any additional
buttons that are pressed.
Figure #12

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #4 - Managing Serial Data
Page 12
Format Parameters
The TruAngle serial interface uses RS-232 12V signal levels and data format. The format parameters
are set to:
• Baud Rate 4800 BPS
•Startbit 1
• Data bits 8
• Stop bit 1
• Parity None
Serial Ports Pin-out Assignments
Serial Commands
• Serial commands that start the “$” character pass through the TruAngle to the laser. For information about
these serial commands, please refer to the user’s manual that shipped with your laser.
• Serial commands that start with the “#” character are intercepted and acted upon by TruAngle.
•
TruPulse Series and TruSpeed Sx Lasers Only : Serial commands can be sent to the laser via a PC, while
cabled to the TruAngle. For example, the $GO command will fire the laser, capture a measurement, and
then download the serial data string from the laser to TruAngle, capture the angle measurement and then
download the complete serial data string to the PC. For more laser serial commands please refer to the
user’s manual that shipped with your laser.
Serial Requests
Instrument Identification
Command: $ID<CR><LF>
where: #= message identifier
ID = refers to TruAngle Firmware Version
<CR> = carriage return
<LF> = line feed
Instrument Reply: #ID,LCAE,
version number,date <CR><LF>
Example Reply: #ID,LCAE,1.14,07-28-10<CR><LF>
Figure #13

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #4 - Managing Serial Data
Page 13
Serial Commands
Zero the Display
Command: #ZERO<CR><LF>
where: #= message identifier
ZERO = refers to Zero the Display
<CR> = carriage return
<LF> = line feed
Instrument Reply: #OK<CR><LF>
Report Current Angle (shown on the LCD)
Command: #ANG<CR><LF>
where: #= message identifier
ANG = refers to Report the Current Angle
<CR> = carriage return
<LF> = line feed
Example Reply: #ANG,
23.96 <CR><LF>
Power Down the TruAngle
Command: #PWR<CR><LF>
where: #= message identifier
PWR = refers to Power Down the TruAngle
<CR> = carriage return
<LF> = line feed
Example Reply: #OK<CR><LF>
Time Out Interval
The factory default Time Out Interval is 60 minutes (Page 8). This command allows you to change the Time
Out interval.
Get: #TO<CR><LF>
Reply: #TO,
n <CR><LF>
Set: #TO,
n <CR><LF>
Instrument Reply: #OK<CR><LF>
where: #= message identifier
TO = refers to the Time Out Interval
n = 5 5-minute time-out
10 10-minute time-out
60 60 for 60-minute time-out
XXXXX XXXXX-minute time-out
(any number between 0 and 65534)
65535 No Time Out Interval. Always on.
<CR> = carriage return
<LF> = line feed
Example: #TO,10<CR><LF>
Sets the Time Out Interval to 10 minutes.

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #4 - Managing Serial Data
Page 14
Backlight Status
Get: #BL<CR><LF>
Instrument Reply: #BL,
n <CR><LF>
Set: #BL,
n <CR><LF>
Instrument Reply: #OK<CR><LF>
where: #= message identifier
BL = Backlight Status
n = 0 = Backlight OFF
1 = Backlight ON
<CR> = carriage return
<LF> = line feed
Example: #BL,1<CR><LF>
Turns the backlight ON.
Backsight
Set: #BS, n <CR><LF>
Instrument Reply: #OK<CR><LF>
where: #= message identifier
BS = Backsight
n = 1 = Puts instrument in Backsight mode
(display flashes so display angle can be set).
2 = Locks Backsight angle in display so
instrument can be aimed at target.
3 = Locked angle is set as current angle, display
flashes 3 times, and normal operation resumes.
4 = Cancels Backsight operation after a #BS,1 or
#BS,2 command and returns the instrument to
normal operation.
<CR> = carriage return
<LF> = line feed
Example: #BS,1<CR><LF> Turns on the backlight.
TruPulse Series and TruSpeed Sx Only
Serial commands can be sent to the TruPulse series and TruSpeed Sx via PC, while cabled to the TruAngle.
For example, the $GO command will fire the laser and capture a measurement. Then the laser will download
the serial string into the TruAngle, capture the angle measurement and download the data string to the PC. For
information about additional commands, please refer to the user’s manual that shipped with your laser.

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #4 - Managing Serial Data
Page 15
Error Messages
If an error is encountered, an error message will be output instead of the #OK message.
#ER,
n <CR><LF>
where: #= message identifier
ER = Error
n = 1 = Command syntax error (unrecognized character etc.)
*Try to enter command again.
2 = Memory checksum failure
*If you see this code, try cycling the power OFF and
ON, and then repeat the measurement. If the error
persists, please contact Laser Technology, Inc. for
assistance.
3 = Instrument is in Index Mode
*Rotate the unit to set the index (Page 9).
4 = Instrument is in Backsight Mode
*Set the non-zero backsight or cancel Backsight Mode.
<CR> = carriage return
<LF> = line feed
Example: #ER,3<CR><LF> Instrument is in Index Mode.

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #5 - Caring for the TruAngle
Page 16
Section #5 - Caring for the TruAngle
Operating Temperature
The TruAngle components are rated for a temperature range of -22to 122F (-30to 50C).
Do not expose the instrument to temperatures outside this range.
Moisture and Dust Protection
The Angle Encoder is sealed to provide protection from normally expected field conditions. It is protected
from dust and water, and features temporary submersion resistance.
If water leakage is suspected:
1. Power OFF the Angle Encoder.
2. Remove the batteries.
3. Air-dry the encoder at room temperature with the battery compartment open.
Shock Protection
The TruAngle is a precision instrument and should be handled with care. It will withstand a reasonable
drop shock. If the encoder is subjected to a severe mechanical shock, you should power on the instrument
and index the encoder (Page 9).
Cleaning and Storage
Clean the TruAngle after each use. Before returning it to its case, check for the following items:
•Excess moisture. Towel off excess moisture, and air-dry the instrument at room
temperature with the battery compartment open and the batteries removed.
•Exterior dirt. Wipe exterior surfaces clean. Use isopropanol to remove dirt and
fingerprints from the exterior surfaces.
•Batteries. If you do not expect to use the TruAngle again soon, remove the
batteries before storing it.
Display Screen
It is a good idea to periodically check the display screen to make certain that all display segments are
working properly. For more information, see Extend the Display Segment Test (Page 8).

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #6 - Troubleshooting & Tips
Page 17
Section #6 - Troubleshooting & Tips
If you see this issue… … take this action
The angles output by the TruAngle do not
appear to be accurate.
Make sure the TruAngle is level before you
power it On (Page 6).
When mounting the TruAngle, make sure
the base is completely tight to the top of
the tripod, adapter or staff you are using;
and does not rotate. To aid in this, tighten
down the friction lock so the entire unit
will not rotate.
When turning the unit, the gears seem to
grind.
Loosen the friction lock until it moves
smoothly.
After referencing the TruAngle, the data
strings are not being output. The display
is updating when rotated but now it is
flashing.
The ZERO/BS button was inadvertently
pressed. Cycle the Power Off/On, and
re-reference the unit and try again.
The display reads “ind” and will not go
into the Zero backsight mode.
Rotate the TruAngle through 360 degrees
until the display starts to flash “0.00”.

LTI MapStar TruAngle User’s Manual 3rd Edition
Section #7 - Specifications
Page 18
Section #7 - Specifications
Accuracy: 0.1staff mounted
0.05tripod mounted
Range: 0to 359.99
Display Resolution: 0.01
Angle Resolution: 0.01
Measurement Units: Degrees
Power supply: 2 AA batteries
8 hours continuous use
Environment: Water and Dust Resistant: IP54
Temperature: Operating: -22to +122F (-30to +50C)
Storage: -40to +176F (-40to +80C)
Size: Height to top of bubble level: 5.6 in 14.2 cm
Diameter: 4.55 in 11.6 cm
Width with tall side brackets: 5.65 in 14.4 cm
Width with short side brackets: 5.41 in 13.7 cm
Short Side Bracket total height: 10.43 in 26.5 cm
Tall Side Bracket total height: 15.08 in 38.3 cm
Weight: 2.25 lbs (1.02 kg)
Weight includes batteries, does not include side brackets
Construction: Fiberglass filled polycarbonate
Tripod Mount: 5/8 inch threaded insert
Data Output: RS232 Serial - NMEA 0183 format
Sensor Type: High resolution optical encoder