PowerCable Modbus 101x | NETIO product a.s.

NETIO PowerCable Modbus 101x is a smart WiFi power socket by NETIO products. The output smart power outlet can be turned on/off over a web interface. The web interface also shows measured electrical values (V, A, kWh, W, Hz, TruePF). PowerCable Modbus 101x supports the industry-standard Modbus/TCP protocol and Telnet protocol for M2M communication. This protocol makes it possible to measure energy consumption and control the output from PLCs, SCADA systems, smart home applications, and so on.


PowerCable can be used for metering or on/off switching of computer power supplies up to the electrical socket rating (10/16A according to version).

As a unique feature, the metered power socket supports ZCS (Zero Current Switching). This makes it possible to connect capacitive loads (switching power supplies) or inductive loads (transformers, motors) to the PowerCable.

The output can be switched on with a delay, in order to avoid circuit breaker tripping when power is restored after an outage. The metered power outlet can be switched on/off at any time with the button on the device (press 3 times).

PowerCable Modbus connects to the network using WiFi (internal antenna). The initial WiFi connection is very simple: PowerCable works as a WiFi AP, searches for available WiFi networks and asks the user to select from them.

The web interface is used to configure the product and switch the output on or off. Measurements of immediate current [A], voltage [V], energy consumed [Wh / kWh], grid frequency [Hz], input power [W] and TPF (True Power Factor) are also displayed in the web interface and can be read over the Modbus/TCP and Telnet M2M protocol.


The manufacturer, NETIO products, offers NETIO PowerCable Modbus 101x in four versions with different electrical outlet and power plug types used in different markets:

  • PowerCable Modbus 101F DE socket (Type F - Schuko) is used in most of the continental Europe and can be used in Russia.
  • PowerCable Modbus 101E FR socket (Type E) with an earth pin is needed in France, Belgium, Czech Republic, Slovakia and Poland.
  • PowerCable Modbus 101J CH socket and plug (Type J) for Switzerland.
  • PowerCable Modbus 101S Universal version usable world-wide with IEC-320 C14 (input) and C13 (output) for 110/230V 50/60Hz.
  • PowerCable Modbus 101G UK socket and plug (Type G) for Great Britain.


WiFi Reconnect

The WiFi Reconnect function of the PowerCable Modbus 101x smart electrical outlet ensures a stable LAN connection even with an unstable WiFi AP, a necessity to switch over from one WiFi AP to another due to fluctuating signal, and so on.


Modbus/TCP and Telnet API

The PowerCable Modbus 101x smart power extension cable is designed for semi-industrial applications, where the Modbus/TCP protocol is the de-facto M2M standard.  Modbus/TCP is supported by a majority of PLC, RTU, HMI, robots or smart home / smart building applications.

The metered power socket can be controlled over Modbus/TCP as a “coil” or with commands such as “Short ON”, “Short OFF”, “Toggle”. All measured values can be read over Modbus/TCP.

To ensure a basic level of security, the built-in IP FILTER can be used to limit the range of IP addresses allowed to access the device over Modbus/TCP.


  • NETIO M2M Modbus/TCP documentation is available upon request.
  • The NETIO implementation of Modbus/TCP can be tested as described in AN27 (Modbus/TCP with NETIO 4x - Control and measure LAN power sockets).
  • The Modbus/TCP is identical for both PowerCable Modbus 101x and NETIO 4x products. So, the same configuration file or plugin can be used.


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Application of M2M protocol Modbus/TCP

Modbus/TCP controlled power socket NETIO PowerCableModbus

Modbus/TCP was originally designed for communication between a PLC (an industrial controller) and its sensors and actuators. It is considered an industry-standard, and it is very wide-spread thanks to its simplicity. There are many test utilities available and various smart building systems or audio/video presentation systems support it, too.


Modbus registers

NETIO PowerCable Modbus, being a WiFi controlled outlet, connects to a standard LAN via WiFi. The M2M communication using the Modbus/TCP protocol takes place over a standard TCP/IP connection at port 502.


Switching the power outlet 110/230V on or off:

  • Modbus function 05 (Write Single Coil)
  • Modbus register address 101 = 0/1


Toggling the power outlet 110/230V:

  • Function 06 (Write Single Register)
  • Modbus register address 101 = 4


Reading the current through the power outlet:

  • Function 04 (Read Input Registers)
  • Read the Modbus address 101 – the uInt16 value is the output current [mA]



NETIO Modbus/TCP specification:

Modbus / TCP - description of NETIO M2M API interface - PDF


ZCS (Zero Current Switching)

Zero Current Switching function in smart power sockets

An important feature of PowerCable Modbus 101x is ZCS (Zero Current Switching). Zero Current Switching support means that PowerCable Modbus connects or disconnects its 110/230VAC output using a relay when the immediate current value is close to zero

  • Thanks to ZCS, PowerCable can control switching power supplies (servers, computers and other IT equipment) rated up to the maximum of the given mains outlet (16A / 10A). 
  • Using ZCS (Zero Current Switching) to switch on the output significantly reduces the chance of a circuit breaker tripping when power is restored after an outage.
  • Since the relay switches when the sinusoidal current curve crosses zero, negative effects of inrush current are significantly reduced.
  • ZCS reduces EMC interference generated by connecting and disconnecting 230V appliances
  • ZCS increases the durability of the device (internal relay).
  • ZCS reduces the failure rate due to a damaged relay

>> More about Zero Current Switching


IOC (Independent Output Control)

IOC Independent power control on WiFi connection in power sockets NETIO

PowerCable Modbus can be used for professional applications, such as powering servers. Output control is completely independent of the WiFi communication subsystem.

The on/off status of the WiFi controlled outlet is not affected by any WiFi disconnection, internal device reboot, or remote firmware upgrade

>> More about IOC (Independent Current Control)


PowerUp state

Power up State function in NETIO PowerCable Modbus

For some applications, it is important to set the power outlet status immediately after the device is powered on (or the power is restored after a failure). With some machines it is important to avoid momentary switch-on or switch-off. This parameter therefore defines the behavior of the 110/230V output power socket before the standard communication with a master system starts to work

  • On
  • Off
  • LAST state restores the last state before the power was disconnected

Delayed switch-on function ensures that the 110/230V power output is switched on with a configurable delay (several seconds) after the power is restored. This can avoid circuit breaker tripping when power is restored after an outage.

>> More about PowerUp state

Electrical measurement

Power measurement of A, W, Wh, V, HZ, ...

PowerCable Modbus 101x measures the most important electrical parameters. All measured values are shown in the device web interface and can be read over Modbus/TCP. Use the device e.g. as a WiFi power meter.

  • Current [A]
  • Output power [W]
  • Energy [Wh]
  • TPF (True Power Factor)
  • Voltage [V]
  • Mains grid frequency [Hz]
  • Phase [-180...180°]

>> More about electrical measurement

Quick WiFi connection setup

Access point function in smart wifi controlled power sockets NETIO

The package includes the PowerCable QIG with instructions on how to quickly connect the device to your WiFi network and perform initial configuration over the web interface. 

  • NETIO PowerCable creates a WiFi network that you connect to with your PC or mobile phone.
  • It then scans for WiFi networks in the vicinity, and lets you choose from a list and type the password
  • NETIO PowerCable then confirms the connection to the network and displays the assigned IP address
  • NETIO PowerCable devices can be discovered in the LAN using the NETIO Discover tool.


General properties



Smart switching



OEM ready

Lua scripts

- 1 ZCS 6 values - - Modbus/TCP, Telnet
- - 1 ZCS 6 values - - XML, JSON, URL API
(comming soon
- - 1 ZCS 6 values - - MQTT
- - 1 ZCS 6 values - - - IQRF
(comming soon)
- - 1 ZCS 6 values - XML, JSON, URL API,
Modbus/TCP, Telnet


Technical specifications

  • PowerCable Modbus 101F Wifi prolong cable with power measurementLAN (RJ45): No
  • WiFi: Yes (internal antenna, 802.11 b/g/n; 2.4GHz)
  • WiFi Reconnect: Yes
  • Online demo: No
  • Web: Built-in web server
  • Mobile app: No
  • Mobile app needed for instalation: No
  • Control button: Yes


  • M2M API protocol: Modbus/TCP and Telnet
  • M2M API - HTTP(s): No
  • M2M API - Cloud: No
  • Lua support: No


  • Scheduler function: No
  • IP WatchDog function: No
  • Sending emails: No
  • WiFi AP network mode support: No
  • Extended security: Yes, IP Filter
  • Event log: Yes (web)


European types of power sockets and outlets

  • Power input: The “x” in the “101x” model number specifies the power plug type
  • Power output: The “x” in the “101x” model number specifies the socket type
  • Maximum load: 230V / 16A (10A for 101J a 101S)
  • Voltage: 230V / 50Hz (Model 101S also supports 110V / 60Hz)


Electrical socket types:

  • PowerCable Modbus 101F  - DE (Type F - Schuko)
  • PowerCable Modbus 101E  - FR (Type E) - France, Belgium, Czech republic, Poland
  • PowerCable Modbus 101J  - CH (Type J) - Switzerland
  • PowerCable Modbus 101S - IEC-320 C13/C14 - 110/230V - 50/60Hz.
  • PowerCable Modbus 101G - UK (Type G) - Great Britain


  • Internal consumption: Max 2 W
  • Electrical measurement: Current [A] / Energy [kWh] / Input power [W], TPF (True Power Factor),  Frequency [Hz] / Voltage [V]
  • SPD - surge protection: Yes, type 3
  • IOC (output state independent on FW update): Yes
  • ZCS (zero-current output switching): Yes
  • Default output state : On / Off / Last state


  • Mechanical characteristics: Plastic housing - 180 x 40 x 30 mm + 2x cable 0,55m
  • Protection: IP30
  • Mechanical mounting: No
  • Sound output: No
  • Temperature range: -10°C to +65°C (for 65°C max. current is 5A)
  • Designed and manufactured: European Union (Czech Republic , Prague)


Expand all

Does PowerCable Modbus also support Modbus-RTU?

No, the Modbus-RTU protocol is used in devices with RS-232 and RS-485 physical interfaces. PowerCable Modbus connects to the network via WiFi, there is no RS-485 or RS-232.

Is it possible to change the on/off state with the button on the NETIO power strip?

Yes. Press the button 3 times, e.g. with a straightened paper clip, and the output switches to the other state. Unless you change the state using a M2M protocol or over the Web, the change will persist until the power to the device is disconnected. When the device is powered up again, the output will be set according to the PowerUp Init setting (On / Off / LAST value).

I forgot the password, or WiFi is inaccessible, how can I restore the metered power outlet to factory defaults?

For the current procedure, see the QIG manual to the product (available for download here and included in the package). To restore factory defaults, hold the button pressed, plug the device in to a mains outlet and keep holding the button for 15 seconds until the LEDs flash (green+yellow)

My WiFi stopped working. I want to connect PowerCable Modbus 101x to a different WiFi network but I do not want to restore all settings to factory defaults.

This is also possible. Leave the device powered on and hold the button for 15 seconds until the LED flashes (yellow). The device will re-enter the installation AP mode, where you can connect to its WiFi AP and select another available network from the list.

Is it possible to control the PowerCable Modbus 101x output using a mobile app?

No, the NETIO Mobile app cannot be used to control PowerCable Modbus.

Can PowerCable Modbus switch on the schuko smart socket output at a specified time?

No, PowerCable Modbus 101x does not contain the Scheduler function.

How can I test PowerCable Modbus with some Modbus/TCP software?

Modbus/TCP is supported by many programs and utilities. Our implementation is identical with NETIO 4x products, except that PowerCable Modbus only has one output.
For first steps, we recommend AN27 Modbus/TCP with NETIO 4x

Is it possible to control PowerCable Modbus 101x using an IoT cloud?

No, PowerCable Modbus version is designed to work in a LAN only, using the ModBUS/TCP protocol.

When using the WiFi power cable as an electrical cable with kWh meter, how can I access the readings?

All values measured by PowerCable Modbus are accessible in its web interface or over the Modbus-TCP protocol. The device provides all the usual parameters measured by an electric meter – mA, V, Hz, W, kWh, TruePF, °.

Is it possible to use the WiFi smart plug as a remote control electrical socket or a remote control power cable?

Yes, this is one of the main application areas of PowerCable Modbus. For the remote control of the outlet, the industry-standard Modbus/TCP protocol provides compatibility with many industrial and smart building applications, SCADA systems, home automation systems, etc.

Is it possible to make custom modifications for a custom application?

Yes, we offer custom modifications under the “NETIO COBRA” program. Various customizations are possible, including custom M2M protocols, UDP discover devices, labels on the device and its packaging, and so on.


Manual CS
Manual EN
Manual DE
Manual RU
Quick Installation Guide: 

Photo and video

Product comparison

WiFi IQRF Power
smart switching
serial port
Lua scripts
Ext. - 4 - 22 values Yes - Yes Yes Yes 13 protocols
Yes Ext. - 4 - - Yes - Yes Yes Yes 13 protocols
2x - - 4 ZCS 22 values Yes Yes Yes Yes Yes 13 protocols

PowerCable Modbus

- Int. - 1 ZCS 6 values Yes - - - - Modbus/TCP
PowerCable REST - Int. - 1 ZCS 6 values Yes - - - - XML,
PowerCable IQRF - - Int. 1 ZCS 6 values - - - - - IQRF
PowerCable MQTT
(comming soon)
- Int. - 1 ZCS 6 values Yes - - - -


Cobra DevKit
(comming soon)
- Int. - 1 ZCS 7 values Yes - - - - On request


Available models

PowerCable Modbus 101E type E smart power socket
PowerCable Modbus 101E
Metered smart WiFi power outlet 230V / 16A. Socket type E – FR is used in France, Belgium, Czech Republic, Slovakia, Poland.
Schuko smart WiFi power strip NETIO PowerCable Modbus 101F
PowerCable Modbus 101F

Metered smart WiFi power outlet 230V / 16A. Socket type F – DE Schuko is used in most European countries.

Power Cable Modbus 101J Swiss Type smart power strip 230V
PowerCable Modbus 101J
Metered smart WiFi power outlet 230V / 10A. Socket type CH (Type J) – Switzerland.
PowerCable Modbus 101S IEC320 C13/C14 type socket
PowerCable Modbus 101S
Metered smart WiFi power socket. International version with IEC320 C13-C14 connectors – 110/230V – 50/60Hz.
Smart power socket remote controlled over Modbus API or web interface
PowerCable Modbus 101G

Metered smart WiFi power outlet 230V / 13A. Socket type UK (Type G) – Great Britain.

NETIO smart power sockets


Lan ports: 
LAN ethernet switch: 
WiFi AP mode: 
Blue Tooth 4.0 LE: 
Serial port (RS-232): 
SMS Alerts: 
Email alerts: 
Mobile App: 
Scheduler (Chytrý kalendář): 
IP Watchdog Hearbeat): 
Warranty 2: 
6 Months
Protection 2: 
Rack montage: 
Product dimensions: 
340 x 58 x 90 mm
Product weight: 
1,18 Kg
Shipping package: 
420 x 65 x 130 / 1350 g
SNMP v1: 
SNMP v3: 
User certificates: 
MS Azure (MQTT): 
Power Output: 
4x DE (Type F - Schuko)
Power Input: 
230V AC
Power Output sockets: 
Power Input: 
Europlug - cable 1m
Power In max current: 
Max one socket current: 
Power fuse: 
External, mechanical
Current meter: 
Metered values: 
Energy meter: 
XML interface accessible in LUA: 
SNMP interface accessible in LUA: 
Web buttons accessible in LUA: 
CGI interface accessible in LUA: 
PING interface accessible in LUA: 
RS-232 accessible in LUA: 
Online demo IP address: 
NETIO PowerCable Modbus 101x smart wifi power socket
Show download for mobile: 

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For device testing use name/password demo/demo