EZT-NDR-42L EZI-STEP Step Driver: Complete Technical Guide for Industrial Automation
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What is the FASTECH EzT-NDR-42L stepper driver?
The EzT-NDR-42L is FASTECH's networked microstepping driver from the Ezi-STEP Plus-R family — a closed-loop-ready stepper drive that hangs on an RS-485 bus: the dual RJ45 ports (RS485 IN / RS485 OUT) chain up to 31 axes on one cable run, with baud rates from 9,600 to 921,600 bps set on the SW2 switches. This record is a lot of four units in clean second-hand condition, 3-month warranty as recorded — two from a December 2025 intake (serials 1207F6NTD1205 and 1207F6NTD1212) and two from May 2026 (1207F6NTD1195 and 1207F6NTD1201), each labelled Ezi-STEP EzT-NDR-42L, FASTECH, MADE IN KOREA, with two DB26 mating headers included. All twenty-five photos and the two inspection videos show these exact drives.
Part details
| Field | Value |
|---|---|
| Brand | FASTECH — Ezi-STEP Plus-R series, MADE IN KOREA |
| Model | EzT-NDR-42L microstepping driver (42 mm motor class, DC input per the NDR family) |
| Network | RS-485 on dual RJ45 (RS485 IN / RS485 OUT); communication speed via SW2.4/3/2 — 9,600 to 921,600 bps; terminating resistor via SW2.1 |
| Node ID | ID Display (7-segment LED, factory 0) + ID Selector rotary (0-9/A-F), PWR / CW / CCW / ALM indicators |
| Connectors | RS485 8-pin (SGND/A+/B− lines), ENCODER 10-pin (A±/B±/Z±/5V/5G/FG), IN/OUT 26-pin D-Sub (LIMIT+, LIMIT−, ORIGIN, IN1-IN8, COMP, OUT1-OUT8, Brake±, 24G/24V), MOTOR power/phase header plus PWR lead set |
| Serials | 1207F6NTD1195, 1207F6NTD1201, 1207F6NTD1205, 1207F6NTD1212 |
| Accessories | Two DB26 female mating headers with colour-coded leads |
| Quantity | 4 drives, clean second-hand condition, 3-month warranty as recorded at intake (Dec 2025 and May 2026) |
Values are read from the face silkscreen, the yellow labels and the photographed construction in the photo set.
Why network steppers change the wiring game
A conventional stepper driver wants a pulse train per axis — one pair of wires for steps, one for direction, times every axis in the machine, all length-matched and noise-managed. The Plus-R family replaces that with one bus: the controller talks RS-485 to each drive by its ID, and the drives run their own profiles locally. That is what the silkscreen on this unit maps out — the RS485 pin block for the bus, the ID Display and Selector that give each axis its address, the SW2 bank that sets the baud rate and the bus termination — and it is why a machine built on these can add an axis with an RJ45 patch cable instead of a loom. The 26-pin IN/OUT connector keeps the hard-wired side where it belongs: the limit and origin switches feed in, the comparator and general outputs feed out, and the brake pair drives a motor brake from the dedicated 24 V rail.
The four units in this lot are the same 1207F6NTD production wave within a few serial numbers of each other — 1195 and 1201 from the later intake, 1205 and 1212 from the earlier — all in the anodised rose chassis with the mounting flanges and heatsink base intact, the LED and rotary ID windows unmarked, and the power lead sets still dressed. As test-bench spares for a Plus-R machine they drop straight in: set the ID, set the bus speed to match the controller, and the axis is back.
Photos
All images below are original KOEED warehouse photos. Click any photo to view it full size.
For the servo-side counterpart from the same shelf, see the Yaskawa SGDH-01AE servo driver — the closed-loop servo alternative to networked stepping.
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