P r i m a L u c e L a b S p A
S E S T O S E N S O 2 u s e r m a n u a l
Troubleshooting
Q: I connect SESTO SENSO 2 to my computer and 12V power, but when I start FOCUSER Manager it doe-
sn’t connect.
A: Please check that, after selecting the COM port of your SESTO SENSO 2 focusing motor, you press the “Open/
Close” button. If the SESTO SENSO 2 doesn’t still connect, this may be related to the USB-C cable that is not wor-
king. Please try to change the USB-C cable with another one and connect SESTO SENSO 2 to the same compu-
ter. Please enter in Windows Device Manager and check that the “Silicon Labs CP210x” driver (under “Ports (COM
& LPT)”) is correctly loaded. If the USB-C cable works correctly, the driver will be loaded and you will be able to
connect with FOCUSER Manager software.
Q: I connect SESTO SENSO 2 to computer but it doesn’t move and PWR LED blinks.
A: If the PWR LED light blinks, it means that SESTO SENSO 2 is not 12V powered (you can’t use SESTO SENSO
2 without 12V power) so please connect to 12V power source.
Q: My SESTO SENSO 2 is connected and correctly powered but the PWR LED still blinks.
A: PWR LED light also blinks when the SESTO SENSO 2 is not calibrated. Please use the CALIBRATION button in
the control software to start the calibration of SESTO SENSO 2 connected to your focuser.
Q: Focus point position in steps changes over time.
A: FOCUSER manager and the SESTO SENSO ASCOM driver shows the focuser position in steps or in millime-
tres. If you move the SESTO SENSO 2 focusing motor to reach the perfect focus position, then move the focuser in
another position and recall the previous focus position, your image should be in perfect focus again. If this is not
happening, this means that your focuser has some mechanical slippage (that can’t be automatically detected by
SESTO SENSO 2 since it’s an external focusing motor), and this may be a normal limitation in inexpensive focu-
sers. In order to minimise this effect, you can set your SESTO SENSO 2 to move with lower speed: in FOCUSER
Manager software please click on “ADV SETTINGS” button. Here please set the Acceleration, Run, and Decelera-
tion values (in Speed Settings) to 1.
Q: My SESTO SENSO 2 focuser doesn’t connect with ASCOM drivers.
A: SESTO SENSO 2 focusing motor has been tested with ASCOM Platform 6.4 and later. By using third party soft-
wares to control SESTO SENSO 2 through ASCOM platform, please check you are using ASCOM Platform at least
version 6.4.
Q: When I connect external temperature sensor to my SESTO SENSO 2 I get wrong temperature readings.
A: External temperature probes are tested in our laboratory before shipment. If you get a strange value in the “Ex-
ternal temperature” field of FOCUSER Manager software, the temperature probe may have an hardware issue and
has to be fixed or changed.
Q: When I connect SESTO SENSO 2 to FOCUSER Manager, I can’t connect to another software.
A: This is normal. In fact, when you connect SESTO SENSO 2 to any software, it can’t be used from another soft-
ware, until you disconnect it from the first software, because the serial connection can be done only once. If you
want to use SESTO SENSO 2 with more softwares, please remember to disconnect it from the first software before
moving to the other one.
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