WIRELESS ENCODER TRANSMISSION SYSTEM

WENC2 Wireless Encoder System

Designed for cable machines and bunchers: carries encoder signals from the rotating side over 5 GHz and provides the feedback for closed-loop control of the asynchronous motor. End of slip-ring failures, cable fatigue and maintenance downtime.

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WENC2 Product
0:20 PRODUCT DEMO

See WENC2 in action

Wireless encoder transmission at 5 GHz. Real-time signal reproduction to the drive. Watch a 20-second walkthrough of the system.

5 GHz — Unlicensed ISM band, low latency
< 1 ms — Typical round-trip latency
100 m+ — Line-of-sight range
ENC1 M1 ENC2 M2 ENC3 M3 TRANSMITTER 5 GHz WIRELESS RECEIVER VFD INVERTER D1 1450 RPM 50.0 Hz RUN RDY ALM VFD INVERTER D2 1450 RPM 50.0 Hz RUN RDY ALM VFD INVERTER D3 1450 RPM 50.0 Hz RUN RDY ALM A B ENCODER SIGNALS (A/B) A B REPLICATED A/B SIGNALS 3× 3-PHASE POWER (UVW) CLOSED-LOOP ASYNCHRONOUS MOTOR CONTROL 3 SEPARATE MOTORS + ENCODERS → TX → 5 GHz → RX → 3 DRIVES → 3 MOTORS
0:20 PREVIEW
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Product Overview

WENC2 is a wireless transmitter-receiver system that carries motor encoder signals in industrial environments. The TX (transmitter) reads encoder inputs on the rotating side, and the RX (receiver) reproduces an identical quadrature signal for the drive — without any software or configuration change on the drive side.

It replaces the encoder cable in applications where pulling cable is difficult or impossible: rotating bobbins, rotary tables, slip-ring systems, multi-axis machines, crane drums, and more.

WENC2 TX Module

TX Transmitter Module

Mounted on the motor side, reads encoder signals

WENC2 RX Module

RX Receiver Module

Mounted at the drive cabinet, outputs quadrature A/B

How It Works

Read → transmit → reproduce — transparent to your drive

1. Encoder Reading (TX)

The TX module reads the encoder A/B signals on the motor side through opto-isolated inputs.

2. Wireless Transmission

Data is sent point-to-point on the 5 GHz band with CCMP encryption and automatic channel switching.

3. Signal Reproduction (RX)

The RX reproduces an identical HTL quadrature A/B signal for the drive. The drive sees a real encoder; no software or setting change is needed on the drive side.

Key Features

Wireless
Wi-Fi 6 (802.11ax), 5 GHz only
Link Security
Paired MAC + CCMP
Range (line of sight)
> 100 m open area
Motor Speed
0–6000 RPM @ 1024 ppr (0–102 kHz)
Encoder Input
Incremental quadrature A/B/~A/~B
Output Level
HTL 24 V, overcurrent + short-circuit protected
Position Following
4 output modes, no lost pulses on dropouts
Protection
Opto-isolation • reverse polarity • ESD

Output Modes (Position Following)

Selected per encoder channel to suit the application

The output the RX gives to the drive is selected separately for each encoder channel in the Output Mode section of the service interface. In the position modes (1–3) no pulse is ever lost: after a short link interruption, the missing pulses are completed as soon as the link returns. In speed mode, the last speed is held during short gaps.

ModeLost-pulse recoveryDelayOn dropoutBest for
0 — Speed transfer (default)NoUp to the speed filterOutput stops, difference remainsConstant high speed, speed feedback
1 — Position, safeYes (rate-limited)Slightly behindFalls behind, then catches upLength measurement, counting
2 — Position, predictiveYes (rate-limited)Next to noneFalls behind, then catches upLow speed, ramps, position tracking
3 — Position, servoYesNext to noneCatches up, slight overshoot and returnTight position matching; drive position follower (electronic gearing / master-slave)

Recommendation: speed feedback to the drive → mode 0 · drive position follower → mode 3 · length measurement and counting where no pulse may be lost → mode 1 (choose mode 3 only if a backward step is acceptable).

Model Options

Three variants, same wireless infrastructure

Basic

WENC2-S

Single Encoder (MONO)

  • 1 encoder channel (A/B)
  • 5 GHz wireless communication
  • TX: 1x 8-pin terminal
  • RX: 1x 8-pin terminal
  • Web interface
  • 2nd encoder channel
  • 3rd encoder channel
Ideal for single-encoder applications
Popular

WENC2-D

Dual Encoder (DUO)

  • 2 encoder channels (A/B)
  • 5 GHz wireless communication
  • TX: 1x 8-pin terminal
  • RX: 1x 8-pin terminal
  • Web interface
  • 3rd encoder channel
Recommended for most applications
Maximum

WENC2-T

Triple Encoder (TRI)

  • 3 encoder channels (A/B)
  • 5 GHz wireless communication
  • TX: 2x 8-pin terminal
  • RX: 2x 8-pin terminal
  • Web interface
For multi-shaft monitoring and full feature set

Technical Specifications

5 GHz Multi-Channel

Wireless transmission on the 5 GHz band only, with automatic channel switching; unaffected by 2.4 GHz interference

5 GHz

3 Encoder Channels

Independent A/B phase inputs, 0–102 kHz per channel

3x A/B

Encoder Supply Output

Filtered +23.5 V encoder supply on the TX side, 500 mA continuous

TX Output

Wide Supply Range

Reverse polarity, overvoltage (varistor + fuse) and ESD protection

15–30 V DC

Web Interface

Monitoring, diagnostics, pairing and updates from a tablet or phone in service mode

TX + RX

Parameters Table

ParameterTX (Transmitter)RX (Receiver)
Wireless Communication
Wireless standardWi-Fi 6 (IEEE 802.11ax), 5 GHz only; 5 GHz robust protocol compliant with Wi-Fi 6ax licensingWi-Fi 6 (IEEE 802.11ax), 5 GHz only; 5 GHz robust protocol compliant with Wi-Fi 6ax licensing
TopologyPoint-to-point, automatic channel switchingPoint-to-point, automatic channel switching
Link securityPaired MAC verification + CCMP encryptionPaired MAC verification + CCMP encryption
RF output power≤ 17 dBm≤ 17 dBm
AntennaExternal, 5 GHz, 1.1 dBiExternal, 5 GHz, 1.1 dBi
Range (line of sight)> 100 m in open areas; actual range depends on the environment
Input / Output
EncoderInput: up to 3 channels A, /A, B, /B (HTL, opto-isolated)Output: up to 3 channels A, /A, B, /B (HTL push-pull)
Connection type4-wire (differential) or 2-wire (single-ended)Directly to the drive's encoder input
Pulse frequency0–102 kHz per channel (theoretical limit ≈ 150 kHz)
Index (Z) signalNot used (only A/B is transmitted)
Output current—100 mA sink / 100 mA source per channel; PTC protected, self-recovering
Electrical
Supply voltage15–30 V DC (nominal 24 V)15–30 V DC (nominal 24 V)
Absolute max (short-duration peak)42 V35 V
Typical current @ 24 V28 mA (excluding encoder current)50 mA (no load)
Encoder supply output (terminal 3)Supply − 0.5 V (+23.5 V at 24 V), 500 mA continuous—
Output level—Tracks the supply: ≈ supply − 1 V
Input thresholdsLOW < 13.8 V · HIGH > 14.0 V—
Reverse polarity protectionDown to −32 VDown to −32 V
Overvoltage protection35 V varistor + fuse35 V varistor + fuse
ESD rating (terminals)±4 kV contact / ±8 kV air±4 kV contact / ±8 kV air
Timing
Start-up timePaired device ≈ 12 s (power → normal operation) · unpaired device ≈ 5 s (power → service mode)
Physical & Environmental
Enclosure (W × D × H, excl. antenna)70 × 103 × 60 mm70 × 103 × 60 mm
Weight (incl. antenna, excl. terminals)120 g120 g
MountingTS35 DIN rail clip + screw holesTS35 DIN rail clip + screw holes
Protection classIP20 (closed enclosure on request)IP20 (closed enclosure on request)
Operating temperature−20 °C … +70 °C−20 °C … +70 °C
Storage temperature−40 °C … +85 °C−40 °C … +85 °C
Relative humidity10 – 95 % (non-condensing)10 – 95 % (non-condensing)
Operating altitude≤ 2000 m≤ 2000 m
Terminals2 × 8-pin pluggable screw terminals, 3.81 mm pitch2 × 8-pin pluggable screw terminals, 3.81 mm pitch
Conductor size0.22–0.75 mm² (AWG 24–18)0.22–0.75 mm² (AWG 24–18)
WENC2 TX and RX modules
WENC2 TX and RX modules · 70 × 103 × 60 mm

PPR / RPM Coverage

Transparent forwarding — the speed limit depends on encoder PPR

WENC2 is transparent to the drive — it forwards encoder pulses unchanged. The operating pulse frequency range is 0–102 kHz per channel, with a theoretical limit of ≈ 150 kHz. Reference: 6000 RPM @ 1024 ppr (= 102.4 kHz). The speed limit is inversely proportional to PPR: RPM = f × 60 / PPR.

Encoder PPROperating limitTheoretical limit
51212000 RPM17500 RPM
10246000 RPM8800 RPM
20483000 RPM4400 RPM
40961500 RPM2200 RPM

The mechanical limits of the encoder and motor also apply. When the encoder changes, only the PPR parameter in the drive is updated; no setting is required on WENC2.

Terminal Assignments

Continuous terminal numbering 1–16 on all models

TX (Transmitter — Motor Side)

TerminalFunctionModel
1+24 V supply inputAll
2GNDAll
3+23.5 V encoder supply outputAll
4GND (encoder)All
5ENC0.AAll
6ENC0./AAll
7ENC0.BAll
8ENC0./BAll
9ENC1.AD, T
10ENC1./AD, T
11ENC1.BD, T
12ENC1./BD, T
13ENC2.AT
14ENC2./AT
15ENC2.BT
16ENC2./BT

RX (Receiver — Drive Side)

TerminalFunctionModel
1+24 V supply inputAll
2GNDAll
3GND—
4ENC0.AAll
5ENC0./AAll
6ENC0.BAll
7ENC0./BAll
8GND—
9ENC1.AD, T
10ENC1./AD, T
11ENC1.BD, T
12ENC1./BD, T
13ENC2.AT
14ENC2./AT
15ENC2.BT
16ENC2./BT

Note — 2-wire encoder: only A and B are connected. On the TX side, the /A and /B terminals are bridged to GND; no bridging is done on the RX side. RX outputs are HTL level (24 V) and connect directly to the drive's encoder input.

Connection Diagrams

Wiring for all three models

WENC2-S TX wiring

WENC2-S TX

Single encoder, transmitter side

WENC2-S RX wiring

WENC2-S RX

Single encoder, drive side

WENC2-D TX wiring

WENC2-D TX

Dual encoder, transmitter side

WENC2-D RX wiring

WENC2-D RX

Dual encoder, drive side

WENC2-T TX wiring

WENC2-T TX

Triple encoder, transmitter side

WENC2-T RX wiring

WENC2-T RX

Triple encoder, drive side

Web Interface (Service Mode)

Pair, monitor, diagnose and update from a tablet or phone

WiFi name (SSID)
WENC_RX_xxxxxx / WENC_TX_xxxxxx (last 3 bytes of MAC)
Address
http://192.168.10.1 · wenc-rx.local / wenc-tx.local
Opening
The page opens automatically once connected

Live Monitoring

Live rotation view for each channel; instant RPM, Hz, direction (CW/CCW/Stop) and signal strength with dBm value.

A/B Signal and Cable Diagnostics

A and B levels are shown in colour (green = HIGH, red = LOW). The TX interface checks the cable without pairing: idle / check B / check A / phase / OK.

Pairing and Locate

Scans nearby TX units and creates a persistent pairing. The "Locate" command flashes the device LEDs for ~5 s to show where it is.

Restart Counter

Counts momentary supply interruptions. High TX increase → poor slip-ring contact on the motor side. High RX increase → drive-side supply problem.

Wireless Firmware Update

Signed and encrypted update package; each device is updated over its own WiFi network, no cable needed. Foreign, corrupt or wrong-model packages are rejected.

System Information

TX and RX temperature, firmware version and date, MAC addresses, last reset reason; a black-box log of the last 64 events can be downloaded. Interface language: Turkish / English.

Operating Modes and Single Button

Normal Operation

Paired devices connect automatically at power-up and encoder data is transmitted in real time. The WiFi access point is off; the LEDs show signal strength.

Service Mode

For pairing, monitoring, settings and updates. The device opens a WiFi access point. In service mode the RX output updates at ≈ 100 ms intervals and is not suitable for closed-loop operation.

LED Signal Bar

4 LEDs show signal strength: 4 LEDs > −57 dBm, 3 LEDs > −67 dBm, 2 LEDs > −75 dBm, 1 LED > −85 dBm. Both TX and RX show the bar.

Single-Button Operation

StateActionResult
Normal operationHold 5 sSwitches to service mode; the paired device is also called into service mode. A short press is ignored (no accidental switching).
Service modeShort pressLocate: the paired device's LEDs flash for ~5 s.
Service modeDouble short press60 s pairing window. When pressed twice on both devices, TX and RX pair automatically; no web interface needed.
Service modeHold 3 sLeaves service mode and returns to normal operation.
At power-upHoldStarts in service mode.
At power-upHold 10 sFactory reset (serial number and model are kept).

Secure Update

Automatic Rollback on Failure

After an update, the new firmware must validate itself within 60 seconds. If it does not, the device automatically returns to the previous working firmware. If an upload is interrupted, the device starts with the old firmware.

Signed Package and Version Protection

Only a signed and encrypted package for the correct model is accepted. Anti-rollback protection prevents older firmware from being installed.

Troubleshooting

Quick diagnostic guide

SymptomPossible CauseSolution
LEDs not litNo power or no signalCheck the supply (15–30 V). In normal mode the LEDs stay off when there is no signal.
Pairing failsDevices not in service modePut both devices into service mode; for button pairing, double-press on both devices.
Web interface doesn't openWrong WiFi or mobile dataConnect to the network starting with WENC_ and turn off mobile data; use http://192.168.10.1 (not HTTPS).
Encoder turning, no count at the driveCable fault or RX in service modeUse the A/B diagnostics in the web interface. If the RX is in service mode, return it to normal operation.
Direction inverted at the driveA/B order reversedInvert it in the drive parameters; or swap A and /A on a 4-wire connection, or ENC.A and ENC.B on the TX for a 2-wire connection.
All indicators redNo encoder supplyThe cable may be broken; on a 2-wire connection check the /A, /B → GND bridge on the TX.
Indicators don't changeBroken signal wireCheck the corresponding A or B line.
Position oscillates ±1Wrong wiringCheck the A/B/~A/~B connection order.
Frequent restartsSlip-ring contact or supply problemCompare the counters: TX increase → slip-ring maintenance; RX increase → drive-side supply.
Not working after an updateFaulty firmwareThe device returns to the previous version automatically within 60 s.

Order Information

Order Codes

Order CodeEncoder ChannelsContents
WENC2-MONO (S)1 encoder1 × TX + 1 × RX paired kit
WENC2-DUO (D)2 encoders1 × TX + 1 × RX paired kit
WENC2-TRI (T)3 encoders1 × TX + 1 × RX paired kit

Standard Package Contents

  • 1 × TX transmitter module
  • 1 × RX receiver module
  • 2 × external 5 GHz antennas (1.1 dBi)
  • 4 × 8-pin 3.81 mm pluggable screw terminal sockets
  • Cardboard packaging

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