EM542S, 4.2 A, Open-Loop Stepper Driver

EM542S, 4.2 A, Open-Loop Stepper Driver

SKU: SMC-053

The EM542S open loop stepper driver is able to power 2 phase (1.8°) and 4 phase (0.9°) stepper motors smoothly with very low motor heating & noise. It can provide up to 4.2 A, operating at 20-50 VDC.

  • Manufacturer: Leadshine
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1-4items$82.00/ each 
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  • $82.00
In stock(2 items available)

The EM542S is a new digital stepper drive based on Leadshine’s widely implemented DM stepper drives (10 millions of units in field). While retaining features of simple design, easy setup, high precision and reliability, Leadshine has also upgraded it by adopting the latest stepper control technology and added additional advanced features for better torque (10-25%), quicker response time, control command smoothing, easy self-test, etc.

The EM542S is able to power 2 phase (1.8°) and 4 phase (0.9°) stepper motors smoothly with very low motor heating & noise. All the micro step and output current configurations can be easily done via built in DIP switches. Its control type and command smooth filtering can also be configured via DIP switches. Therefore, the EM542S is an ideal choice for many applications requiring simple step & direction or CW/CCW control of NEMA 17, 23, and 24 stepper motors.


  • Step & direction (PUL/DIR) or CW/CCW (double pulse) control
  • 20-50VDC supply voltage
  • 200 KHz max pulse input frequency
  • 5V / 24V control signal voltage setting by DIP switch, default is 24V
  • 16 micro step settings of 200-25,600 via DIP switches, or 200-51,200 via software (increase by 200)
  • 8 output current settings of 1.0-4.2A via DIP switches, or 0.5-4.2A via software
  • Configurable control command smoothing time to reduce motor vibration
  • Automatic idle current reduction to 50% or 90%
  • Convenient self-test for easy diagnosis
  • Automatic self-configuration to match wide-range NEMA 17, 23, and 24 stepper motors
  • Anti-Resonance for optimal torque, extra smooth motion, low motor heating and noise
  • Soft-start with no “jump” when powered on
  • Optically isolated inputs
  • Fault output and Barke output
  • Over-voltage and over-current protections
  • CE certified and RoHS compliant

The EM542S is suitable for a wide range of stepping motors of size Nema 16, 17 and 23, and suits various kinds of machines, including X-Y tables, labeling machines, laser cutters, engraving machines and pick-place devices.

Programming Cable:

The drive can be tuned with the Protuner software and an Cable-PC-1 DE9 serial cable.

    • SKU
    • Weight
      0.25 kg
    • Dimensions (L x W x H)
      13 x 10 x 4 cm

Supply voltage: 20 to 50 VDC

Output current: 1.0 to 4.2 (3.0 RMS) A

Logic signal current: 7 to 16 mA 

Micro-step resolution: 16 (200 to 25,600) via DIP switches

Pulse input frequency: 0 to 200kHz

Minimal pulse width: 2.5 µS

Minimal direction setup: 5.0 µS

Isolation resistance: 500 MΩ  

Operating environment: 

  • Environment: Avoid dust, oil fog and corrosive gases
  • Ambient temperature: 0 to 65°C
  • Humidity: 40 to 90%RH
  • Operating temperature: 0 to 50°C
  • Vibration: 10 to 50Hz / 0.15mm

Storage temperature: -20 to 65°C

Weight: Approx. 250 g

Dimension: 118 × 75.5 × 26 mm

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.

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