iOptron ASCOM Driver and Commander for CEM40/GEM45

Updated 6/30/2022
Minimum Requirement for this driver:
  • Direct mount control: Windows 7 SP1 /8.1 /10/11 with .NET (dotNET) Framework 4.8 or later installed. Make sure .NET Framework 3.5 is activated in Windows 11.
  • Planetarium control via ASCOM: ASCOM Platform 6.5 SP1 and above
  • Latest firmware installed
  • If Commander does not launch or can't find any mount, Please add the Commander File Fold and/or 3 exe files into the Exclusions/Whit List/Exception of the Antivirus software. Here is the instruction.

Commander and ASCOM Driver Installer (Updated 5/10/2022)
ASCOM 8 Update Notes
CEM40/GEM45 (USB) Commander and ASCOM Application
iOptron Control Command Language 2014 V3.1


If your CEM40/GEM45 has firmware version earlier than V20210101
(uses ASCOM driver and commander V5.7.5.0)
Commander and ASCOM Driver Installer (V5.7.5.0)
ASCOM 5.7 Update Notes
CEM40/GEM45 (USB) Commander and ASCOM Application
iOptron Control Command Language 2014 V2.5