I/O Controller - connecting relay to 230V AC

I/O Controller product offers:

• 8 inputs for voltage 5 to 20V DC
• 8 transistor outputs for voltage circa 12V / 300mA (max. 50V)
• serial port RS-232/485

This application note describes:

• Measuring of voltage 110/230V (2x 230V relays)
  Two 230V relays, contacts are connected to I/O Controller inputs.
• Control of 110/230V voltage (2x 12V relays)
  Two 12V relays, controlled I/O Controller outputs, relay contacts control voltage area 110/230V
• Applications of SW solution
  Overview of application that can be used for control

Note: I/O Controller inputs can be controlled from any contact, for example from button or switch that uses 12V power supply I/O Controller. Here are used Relay contacts for clearness.

Connecting scheme

Details of inputs and outputs connecting to I/O Controller:

• I/O Controller manual
  • I/O Controller pin description (see page 7)
  • Example how to connect light bulb and switch to I/O Controller (see page 7)
• Power for the output relays from external 24V DC power source

Inputs

We connect 2 relay contacts to inputs I.0 and I.4. We use I/O Controller as a power source (typical 12V).

• Connect collective ground of inputs (I.GND) to device ground (GND) - marked (a) in scheme.
• Connect I/O Controller input (for instance I.0) to relay contact (see relay number terminal 14)
• I.0 input connect to power supply (PWR) (see terminal 21)
• Connect contact of the second relay to I.4 - see scheme

 
Outputs

Connect inductor of 2 relays relay to outputs O.2 and O.4. We use I/O Controller as a power source (typical 12V) to control relay.

• Connect output of surge guard (O.COM) to device power supply (PWR) (marked as b in scheme)
  This connection protects I/O Controller from spike of relay inductor.
• Connect I/O Controller output (O.2) to relay inductor (relay terminal A2)
• Connect the second relay inductor (see A1) to power supply of I/O Controller (PWR)
• Connect the second relay controlled from output O.4 same way - see scheme.

 

If you need control output relays to other voltage than I/O Controller device power is (up to 48V DC), check the scheme: Power for the output relays from external 24V DC power source.
 

SDK library control

SDK (Software Development Kit) is available for free upon request to simplify control of I/O Controller. This library will save your time and money for developing own applications for I/O Controller.

SDK consists functions as:

• Network search for I/O Controller (UDP Search)
• Device IP address setting (UDP Config)
• I/O pins control (read bit/byte, set bit/byte)
• Remote setting of serial port parameters (speed, parity, etc.)
• Receive information of I/O Controller input state change without established TCP connection (I/O Controller is TCP client)

The library contains transparent manual describing interface. Examples in different program (MS Visual Basic, Delphi, Borland C++, C# etc.) languages are available for free to illustrate applications of SDK library.

Different program languages examples to control relay

You can use basic program language application to control relay connected to I/O Controller. Sample examples for program languages are available on I/O Controller page for free.

• Relay control over C++
  Simple communication examples with common TCP/IP device in Borland C++ Builder 6.00. The example demonstrates simple terminal client and basic NVT commands (Network Virtual Terminal).


• Relay control over Delphi
  Simple communication example with common TCP/IP device in Borland Delphi 5 demonstrates simple client terminal including basic NVT commands (Network Virtual Terminal) and extention for I/O functions.


• Relay control over MS Visual Basic
  Very simple routines for using NVT commands and TCP/IP device through Winsock in MS Visual Basic 5.0. Very simple commands for remote control of I/O Pins are implemented, TEA not.


• Relay control over Java
  Very simple method to control remote I/O pins via JAVA application. The application can be modify according to your wish


• Relay control over PHP
  Very simple method to control remote I/O pins of I/O Controller. User loads a WWW page from PHP server which takes following actions before response: opens connection to IP address and port, reads values, closes connection to binary device and displays loaded values to the user on the WW page.