Hardware Interfaces & Electrical Parameters

Interface Overview

1. Power Interface

2. PWM Output

3. PWM Indicators

4. USB Power Port

5. Reset Button

6. Power/Run/Net Indicators

7. Switch/NPN/Frequency/Pulse Input

8. Analog Input

9. RS485/Termperature

10. IIC Interface

11. 3V Power Output

12. Relay/Switch Output

13. Relay Indicators

14. RF 433MHz Transmit (Optional)

15. RF 433MHz Receive (Optional)

Detailed Specifications

1. Power Interface ·L/36V ·N/GND ·5V ·GND

· L/36V · N/GND Port

AC Version (Optional): Connect AC 70-270V (47-63Hz) or DC 100-380V. No L/N distinction.

DC Wide Voltage Version (Optional): Supports DC 9-60V (Power >9W). L/36V terminal connects to positive, N/GND terminal to negative.

DC 5V Standard Version: This port is invalid.

· 5V · GND Port

Input Mode: For Standard DC 5V Version. DC 5V (Current >1A), GND connects to negative.

Output Mode: For AC / Wide Voltage Version, this port outputs 5V (Current <100mA), can power small sensors.

· Wiring Examples:

DC Wide Voltage DC 9-60V Power Supply

AC 220V / AC 110V Power Supply

5V Power Supply

2. PWM Output ·P4 ·G4 ·P3 ·G3 ·P2 ·G2 ·P1 ·G1

· Standard PWM

Uses N-MOS open-drain output, Pn port pulled up to DC 5V. Supports frequency control: 0.025Hz ~ 150kHz, duty cycle control: 0.00% ~ 100.00%, supports linear acceleration and deceleration control.

Port Definition: ·Pn represents PWM output positive, ·Gn represents negative (GND).

Load Capacity: Single channel supports max DC 36V 10A switching load or DC 36V 8A PWM load.

Commonly Used For: DC motor speed control, stepper/servo motor pulse control, servo angle, light brightness adjustment, inverter frequency, valve opening, etc.

· Wiring Examples

PWM Interface Simplified Internal Circuit

LED Brightness / DC Motor Speed Control

Stepper Motor Speed Control

Servo Angle Control

2.2, 0-10V Signal Output (Custom)

Pn is output voltage positive, Gn is voltage negative, max load current is 10mA.

0-10V Inverter Control Wiring Example

2.3, 0-20mA Signal Output (Custom)

Pn is current output port, Gn is current input port.

0-20mA Device Control Wiring Example

3. PWM Indicators ·P1 ·P2 ·P3 ·P4

Real-time display of PWM1~4 channel output status. Can observe switching and brightness status.
·P1 represents PWM1 channel output status, P2 represents PWM2 channel output status, and so on.

4. USB Power Port ·USB Pwr

Micro USB (Old) / Type-C (New) interface, for convenient 5V power supply to the device, requires current > 1.5A.
Note: Please use high-quality cables to avoid voltage drop due to high resistance, causing insufficient power supply and device malfunction.

5. Reset Button ·Reboot/Reset RST

· Reboot: Short press 1 time

Device power cycle reboot.

· Reset: Continuous short press 7 times

Operation: Short press 7 times continuously: press 1s, release 1s each time.

Function: Restore factory settings, clear all user configurations, restore device to factory default state.

⚠️ Please use this function with caution.

· APP Operation

In the App, enter the device details page, click "Reset" or "Reboot" button in the "Settings" interface.

6. Power/Run/Net Indicators ·PWR ·RUN ·NET

· Power Indicator (PWR)

Always on indicates normal power supply.

· Run Status (RUN)

Slow Flash (2s/time): System running normally.

Fast Flash (0.5s/time): Bluetooth connecting (App interacting).

Double Flash (2 fast flashes every 2s): MQTT version network connected.

Always On/Off: Running abnormally, please try to power cycle; if still abnormal, it may be a hardware fault.

· Network Status (NET)

Tuya WIFI Version: Fast flash=Waiting for pairing; Always on=Connected; Always off=Connection failed/Connecting.

Tuya 4G / 4G MQTT Version: Slow flash=Connected to base station; Always off=Searching or abnormal.

WIFI MQTT Version: Reserved (No actual function).

7. Switch/NPN/Frequency/Pulse Input ·In1 ·In2 ·In3 ·In4 ·In5 ·In6

· Signal Types

Supports Switch, NPN, Frequency, Pulse signal inputs.

Signal Features: Low level / Negative / GND signal is valid.

High Speed Counting: Supports 20kHz frequency input.

Voltage Withstand: Input port withstand voltage 1KV.

· Supported Devices

Relays, Buttons, Switches, PIR sensors, Limit switches, Photoelectric switches, Magnetic switches, Water level switches, Proximity switches, Infrared beam sensors, etc.

· Wiring Examples

Switch/Button Wiring Example

NPN Sensor Wiring Example

Relay as Input Wiring Example

· View Input Status in App

1. Swipe left/right to view more input statuses.

2. Example 3rd input status: "3~0 2546" means Input 3, current frequency 0Hz, accumulated pulses 2546.

3. Status Colors: Blue: "Active" (Signal present), White: "Silent" (No signal).

8. Analog Input ·Analog1 ·Analog2 ·Analog3

· Signal Types

Supports 0-20mA / 0-10V / Custom ADC etc. analog signal inputs.

Applicable Devices: Level transmitters, Pressure transmitters, Current transmitters, Temperature transmitters, Displacement sensors, Wind speed sensors, etc.

· Supported Range per Gear

0-20mA Gear: Supports 0-20mA, 4-20mA, 0-40mA (New HW)

0-10V Gear: Supports 0-10V, 0-5V, 1-10V, 0-24V (New HW)

Custom ADC Gear: Supports 0-1.5V, 0-3V (New HW) voltage sampling

· Gear Switching (Physical)

Device has a 3-position toggle switch on the side for different signal types.

As shown: Analog 1 is Custom ADC, Analog 2 is 0-10V, Analog 3 is 0-20mA.

· Wiring Examples

2-wire 4-20mA Sensor Wiring

3-wire 4-20mA or 0-10V Sensor

4-wire 4-20mA Sensor

Detect 48V Battery (Custom ADC) - Divider to 1.5V

· View Input Status in App

1. This area has 3 columns, corresponding to Analog Inputs 1 ~ 3.

2. Example (Analog 1): "14.74 0.74V" means Analog 1 converted value (Engineering Unit) is 14.74, raw voltage is 0.74V.

3. Click gear icon on the right to enter parameter settings (as right image).

4. Note: App "Mode" setting must match physical toggle switch.

9. RS485/Termperature ·485B- ·A+/Temp

· A+/Temp Port

Default Function: Supports DS18B20 temperature sensor, reading corresponds to "Temperature 1" in App.

Note: Sensor cable length suggested ≤ 2 meters; too long may cause interference and read failure.

When RS485 Option Selected: This port acts as RS485 A+ port, DS18B20 function unavailable.

DS18B20 Temperature Sensor Wiring Example

· RS485 Modbus RTU (Optional)

IOTAutoMate acts as RS485 Master, supports reading/controlling various RS485 Slave devices.

Protocol: Modbus RTU

Baud Rate: 1200 ~ 38400bps, Data bits: 8, Stop bits: 1, Parity: None

Read Function Codes: 01H, 02H, 03H, 04H

Write Function Codes: 05H, 06H, 0FH, 10H

Device Capacity: Supports up to 16 slaves. Reads 32 data registers and 32 status bits (Coils/Discrete).

Read Cycle: Auto-cycle read every 0.5 seconds.

Slave Address: Supports address range 1 ~ 31.

Supported Devices: PLC, HMI, Smart Meters, Weather Stations, Relay Modules, Servo Motors, Inverters, PH Sensors, Dissolved Oxygen Sensors, etc.

Correct Wiring Example:

Single Device RS485 Wiring Example

Multiple RS485 Devices — Daisy Chain (Bus) Wiring (Correct)

Not Recommended (Prone to Interferance) Wiring Examples:

Multiple RS485 - T-Junction (Prone to Interference)

Multiple RS485 - Star Topology (Prone to Interference)

RS485 App Interfaces:

10. IIC Interface ·SCL ·SDA

Supports IIC device read/write. Built-in SHT30 temp/humidity sensor and light sensor protocol parsing, plug and play.
IIC communication level is 3.3V.
SHT30 temperature value corresponds to "Temperature 2" in App.
Light intensity data defaults to "Counter 8" in App.

· 接线示例

SHT30 Temp/Humidity Sensor

Light Intensity Sensor

Multiple IIC Sensors

· App IIC Related Interfaces:

11. 3V Power Output ·GND ·3V Out

Provides DC 3V power for low-power sensors. Max load current 30mA.
"·3V Out" terminal is positive, "·GND" terminal is negative.

DC 3V Output

12. Relay/Switch Output ·NO1 ·COM1 ·NC1 ... ·NO6 ·COM6 ·NC6

· Relay Output Definition

Relay is an electrically operated switch for circuit on/off control. It is a dry contact output.

Directly controls loads within AC 230V or DC 30V.

Common Uses: Lighting, Water Pumps, Solenoid Valves, AC Contactors, Exhaust Fans, Blowers, Control Cabinet Buttons, DC Motors, etc.

· Each Relay Has 3 Ports:

Normally Open (NO) Normal (OFF): Disconnected from COM
Active (ON): Connected to COM

Common (COM) Normal (OFF): Open from NO, Closed to NC
Active (ON): Closed to NO, Open from NC

Normally Closed (NC) Normal (OFF): Connected to COM
Active (ON): Disconnected from COM

Normal (OFF) (Left) | Active (ON) (Right)

· Electrical Parameters

Max Resistive Load: AC 220V/9A (~1.9kW) or DC 30V/9A (~270W).
(Resistive examples: Heaters, Heating wires, Incandescent lamps)

Max Inductive/Capacitive Load: AC 220V/2A (~440W) or DC 30V/2A (~60W).
(Inductive/Capacitive examples: Solenoid valves, AC Contactors, Motors, Pumps, LED Drivers)

Lifespan: Electrical ~100k cycles, Mechanical ~1M cycles.

Coil Power: ~0.36W (5V/72mA).

⚠️ SAFETY WARNING: High voltage wiring must be done by professional electricians. For high power loads, MUST use external high-power relays or AC contactors.

· 接线示例

Lighting / Pump / Solenoid Valve

DC Motor Forward/Reverse

Control Box NC Button Retrofit

Control Box NO Button Retrofit

13. Relay Indicators ·O1 ·O2 ·O3 ·O4 ·O5 ·O6

Real-time display of relay status.
·O1 indicates Relay 1 / Switch 1, ·O2 indicates Relay 2, and so on.

14. RF 433MHz Transmit (Optional) ·433MHz Tx

Optional. Supports sending 433MHz standard RF signals.

Commonly controls: Wireless switches, Garage doors, Gates, Wireless actuators, etc.

· App 433MHz Tx Interfaces:

15. RF 433MHz Receive (Optional) ·433MHz Rx

Optional. Supports receiving 433MHz standard RF signals.

Commonly receives: 433MHz Remotes, Wireless switches, Wireless sensors, triggering control logic.

Especially suitable for elderly people to control devices via physical remote.