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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
iOptron USB to RS232 converter

iOptron USB to RS232 converter

by iOptron
SKU IOP-8435
$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00
Price Match Policy!
  • Connects iOptron mounts with RS232 ports to modern computers via USB
  • Enables firmware updates for hand controllers and main boards
  • Allows for direct PC control using planetarium software and ASCOM drivers
  • Official iOptron accessory ensures driver compatibility and reliable connection
2 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • iOptron USB to RS232 Converter

    The iOptron USB to RS232 converter is the essential link between your iOptron mount and a modern computer. As laptops and desktops have phased out legacy serial ports, this adapter provides a reliable data connection through a standard USB port, enabling critical communication for firmware updates and advanced computer control.

    Essential Connectivity for iOptron Mount Firmware and PC Control

    This converter is the officially supported method for updating the firmware on your iOptron mount's hand controller and main control board. Using the correct, tested hardware is critical for preventing communication errors during the update process, which could otherwise render a mount inoperable. Beyond firmware, it unlocks the ability to control your mount directly from a PC.

    By connecting your mount to a computer, you can leverage ASCOM drivers to interface with popular planetarium software like Cartes du Ciel, Stellarium, or TheSkyX. This allows you to command your mount from a rich visual interface, replacing the hand controller for object selection and slewing, and is a foundational step for automated imaging sequences.

  • Why do I need the iOptron USB to RS232 converter?

    Most modern computers no longer include the 9-pin RS232 serial port that iOptron mounts use for firmware updates and direct computer control. The iOptron USB to RS232 converter bridges this gap, allowing you to connect your mount's serial port to a standard USB port on your laptop or PC.

    Can I use a generic USB-to-serial adapter with my iOptron mount?

    While some generic adapters may work, many use chipsets with unreliable drivers that can cause connection drops or data corruption, especially during a critical firmware update. Using the official iOptron USB to RS232 converter is highly recommended as it has been tested to ensure stable, error-free communication with their mounts and software.

    What software can I use with the iOptron USB to RS232 converter?

    This converter enables you to connect your mount to a wide range of software. Primarily, you will use it with iOptron's own firmware upgrade utility. For telescope control, it works with any software that communicates via the ASCOM platform, including popular choices like N.I.N.A., Sequence Generator Pro, Cartes du Ciel, and Stellarium.

    How do I use this converter to update the firmware on my iOptron CEM40 mount?

    To update your iOptron CEM40, you will connect the RS232 end of the cable that came with your mount to the port on the mount, and the other end to this converter. Plug the converter's USB end into your computer. After installing the necessary drivers from iOptron's website, you can run the iOptron Upgrade Utility software to load the new firmware onto the mount's main board and hand controller.

    Does the iOptron USB to RS232 converter require special drivers?

    Yes, like most USB-to-serial devices, a driver is required to create a virtual COM port on your computer. You should download the latest drivers directly from the support section of the iOptron website to ensure compatibility with your operating system, whether it's Windows or macOS.

    My new laptop only has USB-C ports. Can I still use this iOptron converter?

    Yes. The iOptron converter terminates in a standard USB-A connector. You can use it with a USB-C-only laptop by using a simple, widely available USB-A to USB-C adapter or a USB-C hub that has USB-A ports. The connection will function identically.

  • iOptron Warranty