AstroLink 4 devices

AstroLink 4 devices were designed and created to make astroimagers life easier. Currently, this family contains two members that have some common functionalities (focuser motor control, regulated PWM outputs, conditions monitoring, switchable outputs, advanced panel software with charts, compensation calculator, alert and protection) but also differ in some aspects.

Common functionalities covered by each family members are:

  • focuser motor output (unipolar and bipolar )
  • advanced temperature compensation with scripting support
  • 2x PWM regulated output to control dew/mirror heaters, fans (40W maximum power per output)
  • 3x 12V switchable on/off power output to control setup components (5A maximum current per output)
  • temperature and humidity sensors to monitor conditions and control regulated outputs
  • monitor voltage, current, and energy consumed
  • programmable overcurrent and overvoltage protection
  • charts, compensation calculator, alerts
  • ASCOM driver with multiple connections available (ASCOM Local Server)

If you look for simple focusing solution, please take a look at the FocuserOne device.


AstroLink 4 mini II

This is another revision of the first device in the family. Provides all the common functionalities, and additionally:

  • two focuser motors support (unipolar, bipolar, microstepping)
  • 3-10V regulated voltage output (1.6A maximum continous current)
  • 5V regulated output via USB port (1.6A maximum continous current)
  • new sensors support (temperature and humidity, sky temperture, sky brightness)
  • INDI driver under development

AstroLink 4 USB

This device is integrated with an active UBS3.0 hub. 3 ports are available. Provides all the common functionalities, and additionally:

  • integrated, active USB3.0 hub with 3 ports available
  • galvanic and optical isolation between the analog and digital parts
  • 5V regulated voltage output (3A maximum current combined with USB hub devices)
  • microstepping control of focuser motors
  • new sensors support (temperature and humidity, sky temperature, sky brightness)
  • INDI driver is available


Latest software and downloads


Key features and differences were presented in the table below.

FeatureAstroLink 4 mini IIAstroLink 4 mini SAstroLink 4 USB
Size122 x 86 x 28 mm145 x 92 x 28 mm 162 x 92 x 29 mm
Weight160g190 g215 g
Supply voltage11-14 V DC11-14 V DC11-14 V DC
Power consumption< 1W< 1W< 2W
Focuser stepper outputtwo steppers: DB9 and RJ12DB9 unipolar, bipolarRJ12 unipolar, bipolar, microstepping
Focuser DC outputnot availableRJ9 4 pin, 1.2A maxnot available
SensorsSensiron SHT3x environmental sensors, MLX sensorDHT22 / DS1820 humidity and temperature sensorsSensiron SHT3x environmental sensors, MLX sensor
Integrated USB hubnot availablenot availableUSB3.0, 3 ports available, galvanic and optical isolation
Regulated PWM outputs2x RCA 0-100%, 40W max2x RCA 0-100%, 40W max2x RCA 0-100%, 40W max
Switchable power outputs3 outputs DC 5.5/2.1mm, 5A max. single output3 outputs DC 5.5/2.1mm, 5A max. single output3 outputs DC 5.5/2.1mm, 5A max. single output
12V permanent output1 output DC 5.5/2.1, 5A max.not available1 output DC 5.5/2.1, 5A max.
Regulated voltage output1 output DC 5.5/2.1mm, 3-10V, 1.5A max. current (2.5A peak)1 output DC 5.5/2.1mm, 3-10V, 1.5A max. current (2.5A peak)1 output DC 5.5/2.1mm, 5V, 3A max (combined with USB outputs)
Dedicated panel softwareyesyesyes
ASCOM driveryes, multiple connections availableyes, multiple connections availableyes, multiple connections available
INDI driverdevelopment in progressyesyes

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