When connected all mains’ functions are available to send commands to the focuser.
Show the actual status of the focuser. Not all status are operational for all focuser type, relative or absolute one have different functionalities.
The INDI FocuserLynx / Focuser BossII driver provides complete functionality for all major features supported by the hub, including relative and absolute positioning, temperature readout, temperature compensation, preset and configuration parameters.
The hub could drive different focusers/motors. The main differences are:
- Absolute / Relative
- Fix / Variable travel range
- Standard / Reverse direction
These instructions cover the use of this hub with an Absolute focuser with Variable travel range. It would be explain to set it in Reverse mode too.
- Check if the motor run in standard direction or reverse one
- Find the number of ticks of the full travel range of the focuser
- Set the actual position (usually the 0 position)
- Find the backlash value
- Set the pre-set value
- Save the configuration for future use
This setting to work is one of many and other procedures could be apply too.
Disengage the motor from the focuser and move it manually to about the middle of the travel range, then re-engage the motor.
- On “main” tab set the Sync value to about 32,500.
- Activate the « Focus IN » button.
- Change the Relative position value to 5000 as example.
- Click on « Set » of Relative Position and look in which direction the focuser is moving.
If the focuser is reducing the focus length that means the configuration is NOT reverse, if it's increasing the focus length then the configuration IS Reverse.
- Select the correct mode on the “Settings” tab, to the Reverse selection parameter.
NOTE: The Reverse function is set in the hub and it will keep saved in the hub's memory. The direction will be applied at switch on.
2. Travel range
- Disengage the motor from the focuser. For normal direction move the focuser to the shortest length of focus. For Reverse one, move to the longest focus length.
- Re-engage the motor to the focuser.
- Set the Sync position to 0 and click to “Set”
- For normal focuser set direction to “Focus OUT”, and for Reverse one set it to “Focus IN”
- Set relative value to about 20,000 ticks and click to “Set” to start moving the focuser.
- When it stop, estimate the ratio between the travel who has been done and the rest of it. Set a new relative value from this estimation, for example 8000 and click to “Set”
- Make a new estimation and continue till you reach the end of the movement.
- If the motor slip on the focuser when it reach the mechanical stop, repeat the complete procedure from 0 till you find a value will stop the motor as close as possible of the travel's end
When you are satisfied with the value you've found, set it on the tab “Settings” on the Max Travel parameter. This value is not stored in the hub, but could be saved with the backup function of the driver. The accuracy of this method is enough to have a correct setting of the driver and no issue when use it with Ekos. If you want to be more accurate you could use a dial indicator to find exactly when the focuser stop to move due to mechanical end.
NOTE: Keep this value in mind, you're going to use it for synchronization if you have selected the reverse mode.
3. Synchronize the driver to the hardware position.
Under the “main” tab of the driver you find the Sync value to set. This is valid for relative or absolute focuser which are not auto calibrated at switching on. (The biggest part of the focuser supported by the hub).
For relative focuser we have to set the Sync position after switching on, or if you've got some important slipping from the focuser.
For Reverse direction:
To Sync it easily, first one you have to know the value of number of ticks on the shortest focuser's position. This value is the one you have found as Max Travel setting step. As example a value of 44,500 ticks.
Then replace in the instruction below for the normal direction the value 0 by the one you've found! In our example use 44,500 instead of 0.
For Normal direction:
- If your focuser is already in park position in shortest focus length (Focus IN), set the Sync value to 0. (ex. 44,500 in case of Reverse focuser).
- If your focuser is anywhere on the range, first move it manually to the shortest position and then set the Sync value to 0 (ex. 44,500 in case of Reverse focuser).
If you prefer use any other position you could do it too. For that you need to have a known position and it ticks value to set it for synchronization.
NOTE: When the driver is synchronized with a relative focuser then it works as an absolute one.
4. Backlash value
For this value we recommend to use a dial indicator to be accurate as much as possible.
When your indicator is installed, move the focuser till the indicator move to any value then stop
- Move the dial ring to 0 or take any other method to get a reference.
- change the direction on the “main” tab
- change the relative value to a short one, 5 or less ticks.
- Start to move step by step with the relative movement, and count the number of steps till the needle begin to move back. Multiply the number of step you've done by the number of ticks you've set will give you the backlash value to configure in the driver on the “Settings” tab.
- Enable or disable the Backlash compensation by the hub on “Backlash activation” parameter.
This value is keep in the hub's memory and will be applied by default at switch on.
5. Preset value
On the “Presets” tab, set till three value as you want, as close as possible of the back focus position of your camera for future use.
6. Backup configuration
To backup your actual configuration goes to the “Options” tab and click on “Save” button.
The configuration you have saved could be recall by different ways. One is to click on “load” button, other one is to configure on EKOS the “Load Device Configuration” to “On connection”. With this selection the configuration will self-loaded on the device connection.
- As indicated before, some setting are store in the hub itself. The driver reads those values on the device connection.
- The configuration is saved in ~/.indi/FocusLynx_config.xml on the PC running indiserver. Typical on raspberry PI unit.
- Please read the user manual provided with the hub to calibrate and set this function.
- You could configured till 5 coefficients
- These are stored in the hub's memory
On the tab “Options” the debug mode could be activated in case of trouble. Please read these instructions before send any support requests to the developers.