ZWO USBST4 guider adapter


Out of stock

SKU: ZWO-USBST4 Category:

Product Description

Small lightweight USB to ST4 adapter

Item include: USBST4, 2 meter USB cable, 2 meter ST4 guider cable

USBST4 (2)USBST4 (3)


the red led will be on if guider is working


connect your mount and USB port of your computer

USBST4 Mount

Software usage:

USBST4 is one USB HID device and you don’t need any native driver to run it, plugin and play!

1.Download and install USBST4 ASCOM Driver (you need install ASCOM platform at first) ASCOM under mount menu


3. choose “ZWO USBST4”

Click “Properties” to show the USBST4 connect status and you can control and test the mount here.


that’s all! you can control your mount through USBST4 now



Our website is continuously updated with the most recent camera drivers as well as software for DSO and planetary imaging. Please make sure the most recent Driver and software have been installed before you start shooting:

It is also recommended to read the Manuals first before shooting.


Fast Shipping: we will choose DHL, UPS, FedEx etc to deliver it. Usually you will get your package within 15-20 days.

  • Fast Shipping(amount ≧ 199USD) for free
  • Fast Shipping(amount < 199USD) : $30.00 (We do not provide free shipping from now on.)


  1. It will take around 60-90 days for shipment via ePacket/China Post Registered Air Mail/EMS, which can’t be guaranteed due to force majeure. If you can’t get the air mail package after 2months, please let us know ASAP:
  2. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  3. Customers from Russia need to provide the complete English name with three words as well as the English shipping address.

Tracking site


China air mail:



  • The price list on our website is USD without tax.
  • Please note that buyers are liable to pay tax involved, such as Import tax, VAT , customs handling fee, etc. The additional fees may be collected at time of delivery by courier.
  • For best local service we advise customers buy our cameras form local dealers.

Warranty and Return Policy

1. ZWO hereby declares that it will provide customers with a warranty period of 2 years for ZWO branded products (excluding APO), as per this policy. APO products will be covered by a 1-year free warranty service, starting from the day following the receipt of the product by the customer. For ASIAIR Plus users, the warranty period will commence from the day of device activation.

Furthermore, ZWO will offer customers a 1-year free warranty service (Warranty Period) for Seestar branded products purchased from ZWO, in accordance with this policy. The warranty period will begin from the day following the receipt of the product by the customer.

2. If a User encounters the following Dead on Arrival (DOA) and contacts ZWO within the corresponding time limit to issue the Product purchase invoice and relevant evidence, ZWO will provide door-to-door pick-up service and, as appropriate, after-sale replacement (or partial replacement), repair or return (or partial return) service for the following Products:
1) Product quality problem
Provided that a User detects a quality problem and contacts ZWO within 30 days after receipt of the Products, and ZWO support team confirms that the Products indeed have a quality problem or defect after their inspection, ZWO will provide free replacement service towards such Products;
2) Product transportation problem
Provided that a User finds obvious signs of bubbling, serious overstocking, or deformation on the outer package of the Products upon receipt of the Products, and provides ZWO with pictures of the outer package and proof of receipt within 3 days after receipt of such Products, ZWO support team will verify the actual shipper and determine the responsible party for such transportation problem. In the event that ZWO is the actual shipper, ZWO will be responsible for providing the relevant return or replacement service, however, if the Products are directly sold or transported to the User by an agent of ZWO, the agent will be responsible for providing the relevant return or replacement service.

3. If the Products are under the following circumstances, they are not within the scope of warranty service, ZWO may provide maintenance services to the Users:
1) The Warranty Period of the Products has expired; or
2) The Products are injected into liquid or affected by moisture or corrosion; or
3) The Products are damaged by an external force (such as the broken of the camera protection window glass, the deformation of the product shell, the broken of the USB port, etc.); or
4) Disassembling, repairing by a third party, refurbishment of the Products (such as downloading erroneous firmware) without the written authorization of ZWO; or
5) The product system is modified, or the maintenance notice is lost or changed; or
6) Product quality problem caused by installation not following the requirements or instructions for the Products; or
7) Physical damage or failure of the Products caused by the force majeure (such as strong vibration or extrusion such as flood, fire, earthquake, or thunder stroke); or
8)Damage caused by the improper User operation during the period of shooting or use, such as using without the equipment protection or direct shooting of the sun; or
9) No valid purchase invoice or warranty certificate; or
10) The Products are second-hand products.
Any quality problem with the accessories or other parts of the Products is not a condition for the return or change of the Products, and the User may solely request to replace the accessories with new ones, which shall be handled after verification by ZWO support team.
If the issue with your ZWO product was caused by certain damage (such as severe damage not covered by the 2-year warranty), you might have to pay the replacement value.

4. For the normal repair or replacement of the Products during the Warranty Period, the User will bear the return cost. When returning the Products, Users shall specify the actual reasons for the damage to the Products, and shall provide the corresponding valid certificates, such as pictures or videos, etc.
For the Products that need to be replaced after being confirmed by ZWO in writing, the User shall return the Products with the complete package, together with all accessories, manuals, etc., to the address designated by ZWO.
By sending back the product to ZWO, the User agrees to pay out-of-warranty fees that may arise during the repair process of the product. ZWO will send back the product after charging.

5. If a User encounters any problem during the use of ZWO Products, you may at any time contact ZWO for technical support via ZWO Support.

For the Products that need to be returned for after-sales service, ZWO will provide the corresponding RMA code for reference.
ZWO will not accept any products having no RMA code that have been returned privately without ZWO written confirmation.

6. If a User purchases the ZWO Products from a ZWO agent, the User may contact the ZWO agent directly for the relevant after-sales service.

Do you have question, answer or comment? Post here!

  1. Avatar

    (verified owner):

    I installed ASCOM6.5SP1 and then ZWO ASCOM v6.5.1.5 on my new Windows 10 Pro PC. However, I can’t use USBST4 because of the following message on ASCOM Chooser.

    Driver setup method failed: “ASCOM.USBST4.Telescope” System.NullReferenceException:

    Do you have any idea to solve this problem?


    • Avatar


      This device is already discontinued and this may be due to lack of maintenance since you are using latest driver and OS.


  2. Avatar


    I need the driver for this but the link on this site is $)$. Please make the driver available again.
    Thank you,


  3. Avatar


    I wanna use this on Mac, however, I couldn’t find INDI driver for this. Is there INDI for this or any way to use this on Mac?


  4. Avatar


    Hi, I bought a USBST4 Adapter yesterday from taobao. When I connected it with a USB cable from my laptop, the LED indicator didn’t work. And then I tried to remove the case of the USBST4, and I found there is no LED component inside. I would like to ask if I bought a fake product or that is just a new version product? Thank you.


    • Sam Wen


      I you don’t need to bother if it works
      I mean ASCOM driver can find this device and control it
      otherwise you need to contact your seller


  5. Avatar


    Hello, Is there a way to use this stuff with a mac book? Is there an INDI driver? Thank you in advance. Regards. David


    • Avatar


      Yes,We support MAC,


  6. Avatar


    I ordered this device after I found the ST4 tracking on the ASI290MC camera non-functional. I installed the driver from the website, but when I plug in the usb adapter it is not recognized by windows (nothing shows up in the “device manager”). Tested it on windows 7, 8.1 and 10 on different machines.

    This is the second product I ordered from you, and the second non-functional product. What’s going on here?



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