iOptron CEM40 User manual

iOptron®Center-Balanced Equatorial Mount
Instruction Manual
Product CEM40, CEM40G, CEM40EC and CEM40-NUC (C40XXX)

2
Please read the included CEM40 Quick Setup Guide (QSG) BEFORE taking the mount out of the
case!
This product is a precision instrument. Please read the included QSG before assembling the
mount. Please read the entire Instruction Manual before operating the mount.
You must hold the mount firmly when disengaging the gear switches. Otherwise personal injury
and/or equipment damage may occur. Any worm system damage due to improper operation will
not be covered by iOptron’s limited warranty.
If you have any questions please contact us at [email protected]m
WARNING!
NEVER USE A TELESCOPE TO LOOK AT THE SUN WITHOUT A PROPER FILTER!
Looking at or near the Sun will cause instant and irreversible damage to your eye.
Children should always have adult supervision while using a telescope.

3
Table of Contents
Table of Contents ...............................................................................................................................................3
1. CEM40 Introduction.......................................................................................................................................5
2. CEM40G Overview........................................................................................................................................6
2.1. Parts List..................................................................................................................................................6
2.2. Identification of Parts ..............................................................................................................................7
2.3. CEM40 Mount Basic Cable Connection.................................................................................................7
2.3.1. Ports on Main Control Board ...........................................................................................................7
2.3.2. Other Ports on a CEM40G Mount....................................................................................................8
2.3.3. Other Ports on a CEM40/CEM40EC Mount....................................................................................9
2.3.4. Other Ports on a CEM40-NUC/CEM40EC-NUC Mount..............................................................10
2.3.5. Pass-through Hole ..........................................................................................................................11
2.4. Go2Nova®Hand Controller ..................................................................................................................12
2.4.1. Key Description..............................................................................................................................12
2.4.2. The LCD Screen.............................................................................................................................13
2.4.3. Install and Check the Hand Controller Battery ..............................................................................14
2.5. Bench Testing the Mount ......................................................................................................................14
3. CEM40 Mount Assembly.............................................................................................................................15
3.1. CEM40 Mount Assembly......................................................................................................................15
4. CEM40 Operation ........................................................................................................................................23
4.1. Set Up the Mount and Perform Polar Alignment..................................................................................23
4.2. Go To a Celestial Object .......................................................................................................................23
4.3. Manual Operation of the Mount............................................................................................................23
4.4. Star Identification Function...................................................................................................................23
4.5. Power-Down Memorization..................................................................................................................23
4.6. Turn Off the Mount...............................................................................................................................24
4.7. Put the Mount Back into the Package/Carrying Case ...........................................................................24
5. Complete Functions of Go2Nova®Hand Controller....................................................................................25
5.1. Select and Slew......................................................................................................................................25
5.1.1. Solar System...................................................................................................................................25
5.1.2. Deep Sky Objects...........................................................................................................................25
5.1.3. Stars................................................................................................................................................25
5.1.4. Comets............................................................................................................................................25
5.1.5. Asteroids.........................................................................................................................................25
5.1.6. Constellations.................................................................................................................................25
5.1.7. Custom Objects ..............................................................................................................................26
5.1.8. Custom R.A. and DEC ...................................................................................................................26
5.2. Sync to Target........................................................................................................................................26
5.3. Alignment..............................................................................................................................................26
5.3.1. Position of Polaris/SigmaOct .........................................................................................................26
5.3.2. Polar Iterate Align ..........................................................................................................................26
5.4. Settings ..................................................................................................................................................26
5.4.1. Set Time and Site............................................................................................................................26
5.4.2. Beep Settings..................................................................................................................................27
5.4.3. Display Settings..............................................................................................................................27
5.4.4. Set Guiding Rate.............................................................................................................................27
5.4.5. Set Tracking Rate...........................................................................................................................28
5.4.6. Set Parking Position .......................................................................................................................28
5.4.7. Meridian Treatment........................................................................................................................28

4
5.4.8. Set Altitude Limit...........................................................................................................................28
5.4.9. Enable CW Up Position..................................................................................................................28
5.4.10. HC Heating Switch.......................................................................................................................29
5.4.11. Set Maximum Slew Rate..............................................................................................................29
5.4.12. Set RA Guiding ............................................................................................................................29
5.4.13. Reset All Settings.........................................................................................................................29
5.4.14. Language ......................................................................................................................................29
5.5. Electric Focuser.....................................................................................................................................29
5.6. PEC Option............................................................................................................................................29
5.6.1. PEC Playback.................................................................................................................................29
5.6.2. Record PEC....................................................................................................................................29
5.6.3. PEC Data Integrity .........................................................................................................................30
5.7. Park Telescope.......................................................................................................................................30
5.8. Edit User Objects...................................................................................................................................30
5.8.1. Enter a New Comet ........................................................................................................................30
5.8.2. Enter Other Objects or Observation List........................................................................................31
5.9. Firmware Information ...........................................................................................................................31
5.10. Zero Position .......................................................................................................................................32
5.10.1. Goto Zero Position .......................................................................................................................32
5.10.2. Set Zero Position ..........................................................................................................................32
5.10.3. Search Zero Pos............................................................................................................................32
6. Maintenance and Servicing ..........................................................................................................................33
6.1. Maintenance ..........................................................................................................................................33
6.2. iOptron Customer Service.....................................................................................................................33
6.3. Product End of Life Disposal Instructions ............................................................................................33
6.4. Battery Replacement and Disposal Instructions....................................................................................33
Appendix A. Technical Specifications.............................................................................................................34
Appendix B. Go2Nova®HC MENU STRUCTURE .......................................................................................35
Appendix C. Go2Nova®Star List ....................................................................................................................38
Appendix D. Gear Meshing Adjustment..........................................................................................................47
Appendix E. Polar Alignment using iPolar Electronic Polar Scope ................................................................51
Appendix F. iGuider for CEM40G...................................................................................................................52
Appendix G. Firmware Upgrade......................................................................................................................58
Appendix H. Computer Control a CEM40 Mount...........................................................................................59
IOPTRON TWO YEAR TELESCOPE, MOUNT, AND CONTROLLER WARRANTY............................60
Ver. 3.1 2023.01
iOptron reserves the rights to revise this instruction without notice. Actual color/contents/design/function may differ from those described in this
instruction manual.

5
1. CEM40 Introduction
The iOptron®CEM40 mount is the next generation of center-balanced equatorial mounts. This mount is
incredibly eye-pleasing, and its beauty is found in more than its appearance. The functionality of the mount
is superb. Weighing in at only 15.8lbs., this mount can support a payload of up to 40lbs! That's incredible!
This mount also has an integrated electronic polar finder scope known as the iPolarTM. This tool ensures the
accurate alignment of a telescope, even when the pole star is obscured. There are large levers on the
quick-lock drive engagement system; these large levers make it easy to snap the gears into place.
Make way for an innovative mount! iOptron CEM40G mount has a built-in iGuiderTM guiding camera. The
mount has a 6” dual saddle that accommodates Losmandy and Vixen-style dovetail plates.. The CEM40
also uses iOptron's ultra-quiet, low-power consumption stepper motor drive system, aiding the mount in
providing precise tracking.
The iOptron CEM40 mount uses the Go2Nova®hand controller to navigate the night sky. This incredible
technology helps observers find celestial objects with the aid of the mount's 212,000+ object database! For
those looking for a telescope that has the capability of tracking and finding beautiful night sky objects, this
mount is a must have tool.
Features:
Unique design, Center-Balanced equatorial mount (CEM) for maximum payload and minimum
mount weight
Idea for both visual observation and astrophotography
Maximum payload of 40 lbs (18 kg) with the mount weight of only 17.4 lbs (7.9 kg)
All metal, CNC machined with red/black anodized
Easy to use quick-lock gear clutches
Integrated iPolarTM electronic polar finder
Built-in iGuiderTM guiding camera (CEM40G model)
Low periodic error: <±7.5 arc seconds for CEM40, CEM40G, < 0.3 arcsec rms for CEM40EC
Permanent periodic error correction (PPEC) or Real-time periodic error correction (for CEM40EC)
Precision stepper motor for precise GOTO and accurate tracking
Go2Nova®hand controller with Advanced GOTONOVA®GOTO Technology with built-in heater
Integrated ST-4 autoguiding port
32-channel external Global Positioning System (GPS)
USB communication port
Cable management system
6” Vixen, Losmandy dual saddle
1.5 inch heavy-duty stainless steel tripod (5kg), optional LiteRocTM tripod or Tri-pier
Optional WiFi module (iStarFi, #7434) for mount control via SmartPhone/Tablet/Computer

6
2. CEM40G Overview
2.1. Parts List1
SHIPPING CONTENTS
Your new CEM40 mount comes in three shipping boxes. One box contains a CEM40 mount head,
hand controller, counterweight shaft, and accessories. One box contains a tripod. Third box is an 11lbs
counterweight (#8027). The contents are:
iOptron®CEM40 telescope mount
oCEM40 with iPolarTM electronic Polar Scope (#C401A1, #C402A1, #C401A3, #C402A3);
oCEM40EC with iPolar and High Precision Optical Encoder (#C404A1, #C404A3);
oCEM40G with iPolar and iGuiderTM guiding system (#C402AG3); or
oCEM40-NUC/CEM40EC-NUC (#C402AN3, #C404AN3)
Go2Nova®Hand Controller
One 11lbs (5 kg) counterweight (#8027)
Stainless steel counterweight shaft (Φ28mm)
CEM40 GPS module
AC adapter with 2.5m/5.5mm DC plug, center positive (100V-240V, indoor use only)
2X coiled control Cable (6P6C RJ11 to RJ11, straight wired)
USB cable
Tripod
Quick Start Guide
OPTIONAL PARTS
Tri-Pier (#8034)
iStarFi wireless adapter (#7434)
ONLINE RESOURCES (click on the “Support” menu at www.iOptron.com)
Quick Start Guide (w/update)
Instructional manual
Tips for set up
Hand controller and mount firmware upgrades (check online for latest version)
iOptron Commander/ASCOM driver
Reviews and feedback from other customers
Accessories
1US market only. Actual contents, design, color and function may vary.

7
2.2. Identification of Parts
Figure 1.CEM40G mount assembly shown
2.3. CEM40 Mount Basic Cable Connection
2.3.1. Ports on Main Control Board
Figure 2. Ports on a CEM40 main board
HBX (Hand Box): For connecting to a Go2Nova Hand Controller
iPORT: Auxiliary port for connecting to other iOptron accessories, such as a GPS receiver, an
iStarFi wi-fi adapter, an electronic focuser or for observatory dome control. DO NOT plug ST-4
guiding camera cable into this port. It will damage the guide camera electronics.

8
2.3.2. Other Ports on a CEM40G Mount
Power Panel on Rear of RA axis
Figure 3. CEM40G Power Panel on Rear of RA axis
POWER (I/O): Power Switch
DC 12V 5A: DC power socket to power the mount (2.5mmX5.5mm, center positive)
USB2.0: USB input port to connect to iPolar, iGuider, USB 2.0 Port on dovetail saddle, as well as
mount computer control and firmware upgrade.
Ports on the Dovetail Saddle
On the back of the dovetail saddle, there are one USB2.0 port and two DC 12V outputs.
Figure 4. Port on back of the dovetail saddle of a CEM40G mount
1X USB 2.0 ports with standard type A connectors for connecting accessory;
2X DC12V power outlet (2.1mmX5.5mm, center positive, max. current 3A in total) for powering
accessories such as CCD cameras, filter wheels, or electric focusers;
The ST-4 guiding port is located in front of the dovetail saddle.
Figure 5. Port on front of the dovetail saddle
ST-4: ST-4 compatible autoguiding port. The wiring is shown in Figure 6

9
Figure 6. ST-4 Compatible Guiding Port Wiring
2.3.3. Other Ports on a CEM40/CEM40EC Mount
Power Panel on Rear of RA axis
Figure 7. CEM40G Power Panel on Rear of RA axis
POWER (I/O): Power Switch
DC 12V 5A: DC power socket to power the mount (2.5mmX5.5mm, center positive)
USB2.0: USB input port to connect to iPolar, iGuider, USB 2.0 Port on dovetail saddle, as well as
mount computer control and firmware upgrade.
Ports on the Dovetail Saddle
Figure 8. Ports on a CEM40/CEM40EC dovetail saddle
On the back of the dovetail saddle, there are following ports:
ST-4: ST-4 compatible autoguiding port. The wiring is shown in Figure 6;
USB: 2X USB2.0 ports with standard type A connectors for connecting accessory;
DC12V 3A: 2X DC12V power outlet (2.1mmX5.5mm, center positive, max. current 3A in total) for
powering accessories such as CCD cameras, filter wheels, or electric focusers

10
2.3.4. Other Ports on a CEM40-NUC/CEM40EC-NUC Mount
Power Panel on Rear of RA axis
Figure 9. CEM40-NUC Input Panel on Rear of RA axis
NUC DC19V: Pass through for NUC power input. Connect the AC adapter come with NUC, 19V,
or 12V for some later model.
DC12V INPUT 5525: Optional 12V power input, 2.5mm/5.5mm, for the 3X power outlets on the
dovetail saddle. Total current 5A.
LAN: Pass through Ethernet input to LAN port on dovetail saddle
I/O (POWER): Power Switch
DC12V (POWER) : DC power socket to power the mount (2.5mmX5.5mm, center positive)
Cable/Port Connection on Dovetail Saddle
Shown in Figure 10 are cable connection between an Intel NUC and the mount.
NUC POWER DC19V：NUC power to power the NUC minicomputer through the mount cable
management system (Yellow line)
LAN：Ethernet ports (blue line)
DC12V OUT 5521：Power outlets from the mount main power, up to 3A
USB2.0: USB2.0 Hub for other USB devices
USB IN: USB port for mount computer controller, which will be connected to a NUC USB port
(red line)

11
Figure 10. Cable/Ports connection of a CEM40-NUC
DC OUTX3：DC outlets，total current 5A, 2.1/5.5 mm plug, powered by cable management
input
GUIDE：Guiding port, support ST-4 guiding device/camera
Suggested Intel NUC
Those NUC with thickness less than 38mm with be fit onto the mount without interference with the
mount body, such as Intel Frost Canyon or Tiger Canyon with “Slim” K chassis. Please double check your
NUC’s mounting holes.
2.3.5. Pass-through Hole
There is a hole on dovetail saddle that allows a user to run his own cables down through the mount
to the bottom of the DEC axle.
Figure 11. Openings for custom cable management

12
2.4. Go2Nova®Hand Controller
Either Go2Nova®8407+ or 8410 hand controller (HC) works with a CEM40 mount. Shown in Figure 12 is an
8410 HC. The difference between an 8407+ and an 8410 is if there is a RS232 port on the HC for firmware
upgrade. The HC has an integrated heater that ensures the LCD display will work at the temperature as low
as -20ºC(-4ºF). It has a large LCD screen, function, direction, and number keys on the front; a red LED
reading light on the back; and a HBX (6-pin) at the bottom.
The CEM40 mount can be operated without the hand controller attached if it is controlled via a
SmartPhone/Tablet/Computer.
Figure 12. Go2Nova®8410 hand controller
2.4.1. Key Description
MENU Key: Press “MENU” to enter the Main Menu.
BACK Key: Move back to the previous screen, or end/cancel current operation, such as slewing.
ENTER Key: Confirm an input, go to the next menu, select a choice, or slew the telescope to a
selected object.
Arrow (▲▼◄►) Keys: The arrow keys are used to control the movement of DEC and R.A. axes.
Press and hold ▲(DEC+),▼(DEC-) buttons to move a telescope along the DEC direction,
◄(R.A.+), ►(R.A.-) to move a telescope along the R.A. direction. They are also used to browse
the menu or move the cursor while in the menu. Press and holding an arrow key for a fast
scrolling.
Number Keys: Input numerical values. Also used to adjust speeds (1: 1X; 2: 2X; 3: 8X; 4: 16X; 5:
64X; 6: 128X; 7: 256X; 8: 512X; 9: MAX)
Light Key(☼): Turns on/off the red LED reading light on the back of the controller.
HBX
Port
R.A.+
R.A.-
DEC-
DEC+

13
Help (?) Key: Identify and display bright stars or objects that the telescope is pointing to.
STOP/0 Key: Stop the mount during GOTO. Also toggling between starting and stopping tracking.
HBX (Handbox) port: connect the HC to the CEM40 mount using a 6P6C RJ11 cable.
2.4.2. The LCD Screen
The Go2Nova HC has a large 8-line, 21-character per line, LCD screen which displays information
on the status of the mount as shown in Figure 13.The user interface is simple and easy to operate.
Figure 13. Go2Nova HC LCD Information Screen
1. Target Name/Mount Position: displays the name of the target that telescope is currently pointed to or
the current mount position.
Zero Position: The reference position for GOTO. The mount can move to Zero Position using
“Goto Zero Position”or “Search Zero Position” command;
User Position: The mount is pointed to a user defined position, which could be a particular
celestial object or simply a position determined by pressing an arrow key;
An object name, such as “Mercury” or “Andromeda Galaxy”: Name of the star or celestial object
that the mount is currently slewing to or tracking.
2. Target R.A.: Right Ascension (R.A.) of the target object.
3. Target Declination: Declination (DEC) of the target object.
4. Right Ascension: Current R.A. of the telescope.
5. Declination: Current DEC of the telescope.
6. Altitude: Altitude of the telescope (degrees vertical from the local horizon - zenith is 90º).
7. Azimuth: Azimuth of the telescope (north is 0º, east is 90º, south is 180º, and west is 270º).
8. Local Date and Time: displays the local time in a format of YY-MM-DD HH:MM:SS.
9. Mount Status: Displays the current operational status of the mount.
Stop: mount is not moving;
Slew: mount is moving with an arrow key is pressed or a GOTO command, such as “Select and
Slew”or “Goto Zero Position”;
Tracking: mount is at a tracking status.
10. GPS status: When the power is turned on, the initial GPS status will be “GPS ON”, which means that
the mount is connected to its GPS receiver and is seeking a satellite signal. When the GPS receiver
finds the satellites and receives the GPS signal the status will change to “GPS OK”.

14
11. PEC status: Display of “PEC” here Indicates the Periodic Error Correction playback is turned on.
Default is off.
12. Tracking speed: Displays the current tracking rate of the mount.
SDRL: mount is tracking at sidereal speed;
Solar: mount is tracking at solar speed;
Lunar: mount is tracking at lunar speed;
CSTM: mount is tracking at a custom, user-defined speed.
13. Slew speed: The mount has 9 slew speeds: 1X, 2X, 8X, 16X, 64X, 128X, 256X, 512X, MAX (~4º/sec).
14. Operation Mode: EQ indicates that the mount is operating in an equatorial mode.
2.4.3. Install and Check the Hand Controller Battery
The hand controller has a real time clock (RTC) which should display the correct time every time the
mount is turned on. If the time is incorrect, please check the battery inside the hand controller and replace it
if needed.
The hand controller uses a CR2032 button battery to keep the Real Time Clock running. The HC is
shipped without battery installed due to shipping restrictions. Open the HC back cover using a good size #1
Phillips driver. With battery + sign facing up, slide the battery under two small metal hooks on the positive
side first. Then push the battery down to make a good contact.
Figure 14. Install a CR2032 battery
If the hand controller can’t display the correct date and time, most likely the battery power is low and
needs be replaced.
2.5. Bench Testing the Mount
The counterweight shaft is designed to counter balance the mount’s own weight. It is recommended
that the CW shaft is installed when testing the mount’s function. Slewing the mount without the CW shaft
installed is not recommended.
NEVER operate the mount with only the counterweight or OTA on it. It may damage the mount
drive system.

15
3. CEM40 Mount Assembly
3.1. CEM40 Mount Assembly
NOTE: The CEM40 mount is a precision astronomical instrument. It is highly recommended that you
read this entire manual and become familiar with the nomenclature and function of all components
before starting assembly.
WARNING: DO NOT rock the counterweight shaft rigorously. This may damage the
worm/drive gear system and such damage will not be covered by warranty.
STEP 1. Remove mount head from package
Remove mount head from package: The RA axle is locked by an Allen wrench. Make sure it is
inserted all the way in. Check the R.A. Gear Switch and make sure it is unlocked before removing the
mount from the box.
Figure 15. Mount in a hard case
STEP 2. Set up tripod
The tripod top is 120 mm in diameter with 2x M6 holes 103 mm apart for mounting. Two additional
M6 holes are for the Alignment Peg (the one on top of a leg is for high latitude use; the other one between
two legs is for low latitudes). Thread the Alignment Peg into the correct M6 hole. Insert the Accessory Tray
through the center rod and secure the setup by tightening Locking Knob from underneath.
Figure 16. Tripod top
Gear Switch
Allen wrench

16
STEP 3. Attach the mount
Retract the 2x Azimuth (Azi) Adjustment Screws from both sides to leave ample space for the
alignment peg to fit in between the 2 Azi Adjustment Screws. Remove the 2x Azi Locking Screws, with
washers, from the mount base. Secure the mount head by tightening the Azi Locking Screws into the M6
holes on the tripod. Use the included Allen wrench if needed.
Figure 17. Attach the mount
Level the mount by adjusting the tripod legs. Use the build-in Bubble Level Indicator or an external
leveler for this purpose.
STEP 4. Adjust latitude
Without any payload, slightly loosen the 4x Latitude Locking Screws. Use the Latitude Adjustment
Knob to set the correct latitude value, as displayed in the Latitude Mark Window. Insert the Allen wrench
into the Latitude Adjustment Knob for more turning torque.
Figure 18. Adjust latitude
Two latitude ranges, 0~35° and 25~60°, can be set up for the mount head. To change the latitude
range from one to the other, both the Latitude Position Bolt and the Latitude Locking Screws need to be
moved to the correct locations (see photos below).
Loosen the Latitude Locking Screws just enough to adjust the latitude setting to 30°. Move the
Latitude Locking Screws with washers (one on each side) to the new locations revealed, do not tighten
them just yet.
Azi. Adj. Screw
Lat. Lock Screw
Lat. Adj. Knob
Lat. Mark
Azi. Lock Screw
Azi. Lock Screw

17
Figure 19. Latitude mark window
Unthread and remove the Position Bolt to its new location. Adjust the Latitude Adjustment Knob
while holding the brass eyebolt until it lines up with the Position Bolt. Secure the Latitude Position Bolt.
Figure 20. Change latitude range
STEP 5. Install Counterweight (CW) Shaft
Thread the CW shaft into the CW shaft mounting house. For low latitudes (<10°), a special CW
mounting house is needed. (Contact iOptron for more information)
Figure 21. Install CW shaft
Position Bolt

18
STEP 6. Install Counterweight(s) and Telescope
Before putting on CW, make sure the mount is at its zero position, i.e., CW shaft points to the
ground. Disengage the R.A. Gear Switch and insert the Allen wrench to lock the RA axis before
loading the CW. Remove the CW Safety Cap at the end of CW Shaft. Glide the CW over the shaft with
the larger hole opening facing down. Tighten the CW Locking Screw to hold the CW in place. Place the
Safety Cap back onto the shaft. Move the CW to the bottom of the shaft and tighten the CW locking Screw.
Figure 22. Install Counterweight
You may need more CW for heavier payloads, or a smaller CW for lighter scopes.
CEM40 is equipped with a Vixen/Losmandy-D dual saddle. It can receive either a Vixen or a
Losmandy-D plate. Release the dovetail saddle locking knobs and slide the telescope dovetail plate into the
saddle. Tighten the saddle locking knobs.
STEP 7. Balance the Payload
Before mounting an OTA, make sure the arrow on dovetail saddle is facing front. If it is not,
release DEC gear switch and rotate dovetail saddle.
After attaching the scope and accessories, the mount head assembly must be balanced in both DEC
and RA axes to ensure minimum stresses on the mount driving mechanism.
CAUTION: The telescope may swing freely when the R.A. or DEC Gear Switch is disengaged.
Always hold on to the mount and/or telescope assembly before releasing the Gear Switches to
prevent it from swinging, which can cause personal injuries and/or equipment damages.
Set the mount at Zero Position. Disengage both RA and DEC gear switches and move the mount to
horizontal position to check balance. Return to Zero Position for balance adjustment. Balance the DEC axis
by moving the scope with accessories back and forth in the mount saddle or within the scope mounting
rings. Balance the assembly in R.A. axis by moving CW along its shaft. Repeat the process until both DEC
and RA axes are balanced.
CAUTION: The balancing process MUST be done with Gear Switch at the total disengaged position!
Otherwise it might damage the worm system.

19
Figure 23. Balance a mount
Return the mount to Zero Position after balancing and engage gear switches.
STEP 8. Connect Cables
Plug in included 12V/5A DC power supply to the DC12V 5A socket, which is located at the end of
the RA axis.
Figure 24. Power connection
Connect the Go2Nova®Hand Controller to the HBX port on the mount main board. Plug GPS
module into the iPORT with a coiled cable. When powering on, GPS ON sign should be displayed at the
upper right corner of the hand controller.
Figure 25. Ports for cables
If you want to use the iPort for another accessory, such as wi-fi adapter (iStarFi #7434), or electronic
focuser (#8451/#8452), you may disconnect the GPS module after it picks up satellites signals and displays
GPS OK on hand controller. (It takes about 1 to 2 minutes in normal conditions).

20
STEP 9. Setting up the Hand Controller
The CEM40 mount is equipped with a GPS receiver which will receive the time, longitude and
latitude information for your current location from satellites after a link is established. However, there are still
some parameters which need to be entered to reflect your location, such as time zone information and
whether daylight saving time is currently in effect. This information will be stored in the hand controller
memory along with longitude and latitude coordinates until they need to be updated.
A clear sky and open space outside is needed for the GPS to establish a link with the satellites.
To set up the controller, press MENU =>“Settings”:
Press ENTER and select “Set Time and Site”
Press ENTER. A time and site information screen will be displayed:
Set Local Time
The time will be updated automatically when the GPS receiver has established its link to the
satellites. In the event that the GPS module is unable to establish a link, local time can be entered manually.
Use the ◄or ► key to move the cursor _ and use the number keys to change the numbers. Use the ▲or
▼button to toggle between “Y” and “N” for Daylight Saving Time, or “+” and “-“ for UTC (Coordinated
Universal Time) setting. Hold the arrow key to fast forward or rewind the cursor.
In order to make the Hand Controller reflect your correct local time, time zone information has to
be entered. Press the ◄or ► key, move the cursor to the third line “UTC -300 Minute(s)” to set the time
zone information (add or subtract 60 minutes per time zone). For example:
Boston is “UTC -300 minutes”
Los Angeles is “UTC -480 minutes”
Rome is “UTC +60 minutes”
Beijing is “UTC +480 minutes”
Sydney is “UTC +600 minutes”
Daylight Saving Time Y
UTC -300 Minute(s)
2019-03-09 10:19:18
Longitude:W071d08m50s
Latitude: N42d30m32s
Northern Hemisphere
Set Time and Site
Beep Settings
Display Settings
Set Guiding Rate
Set Tracking Rate
Set Parking Position
Meridian Treatment
Set Altitude Limit
Set Eyepiece Light
Select and Slew
Sync. to Target
Alignment
Settings
Electric Focuser
PEC Options
Park Telescope
Edit User Objects
Firmware Information