US Digital QSB Quadrature to USB Adapter Overview
QSB is a USB encoder-interface family for a Windows or Linux host. QSB-S, QSB-D and QSB-M have different signal and I/O capabilities, so the chosen suffix and cable must match the measurement task.
Key Specifications
Product detail | Specification |
Manufacturer | US Digital |
Model | US Digital QSB Quadrature to USB Adapter |
Reviewed family | QSB-S, QSB-D and QSB-M |
Host interface | USB Type A; appears as a serial COM interface |
Encoder selection | Single-ended or differential interface depends on variant |
Published quadrature scope | Up to 6 MHz; interpretation must follow the datasheet |
Power | USB-powered adapter and compatible connected encoder |
QSB-M scope | Additional I/O and a step/direction control option; external motor-power hardware required |
Review Summary

Consider QSB for bench checks or a documented host-based encoder interface. Choose the correct electrical input variant and verify the software workflow; a hardware count-rate limit does not establish deterministic PC control timing.
Price and Availability
Request a quote for the selected configuration and delivery schedule. Any published reference price applies only to its stated configuration and is not a store checkout price.


