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Stepper Motor Cable for MSM and Rigel Motors
This dedicated Stepper Motor Cable provides the essential connection between your Pegasus Astro controller and specific, high-precision focus motors. At 1 meter in length, this cable features a custom-wired RJ45 to RJ11 connector configuration designed exclusively for the Starlight Instruments MSM series and Rigel Systems nStep motors, ensuring flawless communication for automated focusing routines.
A Custom-Wired RJ45 to RJ11 Cable for Precision Focuser Control
While the RJ45 and RJ11 connectors are standard, the internal wiring of this 1-meter cable is not. It is purpose-built with a specific pinout required by Starlight MSM and Rigel nStep motors to correctly translate commands from a controller into precise motor steps. Using a standard, off-the-shelf telephone (RJ11) or network (RJ45) cable will not work and can prevent your focuser from operating correctly.
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Guaranteed Compatibility: Engineered specifically for Starlight Instruments MSM and Rigel Systems nStep motors, eliminating guesswork and connection problems.
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Reliable Signal: The custom wiring ensures that power and data signals are correctly routed to the motor's stepper coils for accurate, repeatable focus adjustments.
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Durable Construction: Built to withstand repeated use in the field, with secure-fitting plugs that prevent accidental disconnection during an imaging session.
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Why can't I use a standard phone or ethernet cable for my MSM or Rigel motor?
This cable uses a custom pinout. A standard RJ45 ethernet cable or RJ11 phone cable has a different internal wiring configuration that will not correctly transmit control signals to Starlight MSM or Rigel nStep motors. You must use this specific cable to ensure proper functionality.
What controllers is this Stepper Motor Cable compatible with?
This cable is designed to connect your Starlight MSM or Rigel nStep motor to any controller that uses an RJ45 stepper motor output, such as the Pegasus Astro Ultimate Powerbox or FocusCube series.
Is the 1m length of this motor cable sufficient for a large SCT setup?
A 1-meter (approx. 3.3 feet) length is typically adequate for routing the cable from a focuser-mounted motor to a controller mounted on the optical tube or dovetail bar. For complex setups or pier-mounted controllers, you may need to plan your cable routing carefully to ensure it reaches without strain.
What are the connectors on this Stepper Motor Cable?
The cable features an RJ45 connector on one end (typically for the controller side) and an RJ11 connector on the other end (for the motor side).
My Rigel nStep motor isn't responding. Could the cable be the issue?
First, confirm you are using this specific custom-pinned cable. If so, ensure both the RJ45 and RJ11 plugs are fully seated in their respective ports on the controller and motor. If it still fails, test with another compatible motor if possible to isolate the problem to the cable, motor, or controller port.
Will this cable work with a ZWO EAF or other focuser motors?
No. This cable is wired specifically for the pin configuration of Starlight MSM and Rigel nStep motors. Using it with other motors that have different pinouts will not work and is not recommended.
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| Connector Type |
RJ45 to RJ11 (Custom Pinout) |
| Cable Length |
1m |
| Compatible Motors |
Starlight MSM Motors, Rigel nStep Motors |
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Stepper Motor Cable for MSM and Rigel Motors (1m)
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Pegasus Astro 2-Year Warranty
