Java - Industrial Quad Relay Bricklet

This is the description of the Java API bindings for the Industrial Quad Relay Bricklet. General information and technical specifications for the Industrial Quad Relay Bricklet are summarized in its hardware description.

An installation guide for the Java API bindings is part of their general description.

Examples

The example code below is Public Domain (CC0 1.0).

Simple

Download (ExampleSimple.java)

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import com.tinkerforge.IPConnection;
import com.tinkerforge.BrickletIndustrialQuadRelay;

public class ExampleSimple {
    private static final String HOST = "localhost";
    private static final int PORT = 4223;

    // Change XYZ to the UID of your Industrial Quad Relay Bricklet
    private static final String UID = "XYZ";

    // Note: To make the example code cleaner we do not handle exceptions. Exceptions
    //       you might normally want to catch are described in the documentation
    public static void main(String args[]) throws Exception {
        IPConnection ipcon = new IPConnection(); // Create IP connection
        BrickletIndustrialQuadRelay iqr =
          new BrickletIndustrialQuadRelay(UID, ipcon); // Create device object

        ipcon.connect(HOST, PORT); // Connect to brickd
        // Don't use device before ipcon is connected

        // Turn relays alternating on/off 10 times with 100 ms delay
        for(int i = 0; i < 10; i++) {
            Thread.sleep(100);
            iqr.setValue(1 << 0);
            Thread.sleep(100);
            iqr.setValue(1 << 1);
            Thread.sleep(100);
            iqr.setValue(1 << 2);
            Thread.sleep(100);
            iqr.setValue(1 << 3);
        }

        System.out.println("Press key to exit"); System.in.read();
        ipcon.disconnect();
    }
}

API

Generally, every method of the Java bindings that returns a value can throw a TimeoutException. This exception gets thrown if the device did not respond. If a cable based connection is used, it is unlikely that this exception gets thrown (assuming nobody unplugs the device). However, if a wireless connection is used, timeouts will occur if the distance to the device gets too big.

Beside the TimeoutException there is also a NotConnectedException that is thrown if a method needs to communicate with the device while the IP Connection is not connected.

Since Java does not support multiple return values and return by reference is not possible for primitive types, we use small classes that only consist of member variables. The member variables of the returned objects are described in the corresponding method descriptions.

The package for all Brick/Bricklet bindings and the IP Connection is com.tinkerforge.*

All methods listed below are thread-safe.

Basic Functions

public class BrickletIndustrialQuadRelay(String uid, IPConnection ipcon)

Creates an object with the unique device ID uid:

BrickletIndustrialQuadRelay industrialQuadRelay = new BrickletIndustrialQuadRelay("YOUR_DEVICE_UID", ipcon);

This object can then be used after the IP Connection is connected (see examples above).

public void setValue(int valueMask)

Sets the output value with a bitmask (16bit). A 1 in the bitmask means relay closed and a 0 means relay open.

For example: The value 3 or 0b0011 will close the relay of pins 0-1 and open the other pins.

If no groups are used (see setGroup()), the pins correspond to the markings on the Industrial Quad Relay Bricklet.

If groups are used, the pins correspond to the element in the group. Element 1 in the group will get pins 0-3, element 2 pins 4-7, element 3 pins 8-11 and element 4 pins 12-15.

All running monoflop timers will be aborted if this function is called.

public int getValue()

Returns the bitmask as set by setValue().

Advanced Functions

public void setMonoflop(int selectionMask, int valueMask, long time)

Configures a monoflop of the pins specified by the first parameter bitmask.

The second parameter is a bitmask with the desired value of the specified pins. A 1 in the bitmask means relay closed and a 0 means relay open.

The third parameter indicates the time (in ms) that the pins should hold the value.

If this function is called with the parameters (9, 1, 1500) or (0b1001, 0b0001, 1500): Pin 0 will close and pin 3 will open. In 1.5s pin 0 will open and pin 3 will close again.

A monoflop can be used as a fail-safe mechanism. For example: Lets assume you have a RS485 bus and a Quad Relay Bricklet connected to one of the slave stacks. You can now call this function every second, with a time parameter of two seconds and pin 0 closed. Pin 0 will be closed all the time. If now the RS485 connection is lost, then pin 0 will be opened in at most two seconds.

public BrickletIndustrialQuadRelay.Monoflop getMonoflop(short pin)

Returns (for the given pin) the current value and the time as set by setMonoflop() as well as the remaining time until the value flips.

If the timer is not running currently, the remaining time will be returned as 0.

The returned object has the public member variables int value, long time and long timeRemaining.

public void setGroup(char[] group)

Sets a group of Quad Relay Bricklets that should work together. You can find Bricklets that can be grouped together with getAvailableForGroup().

The group consists of 4 elements. Element 1 in the group will get pins 0-3, element 2 pins 4-7, element 3 pins 8-11 and element 4 pins 12-15.

Each element can either be one of the ports ('a' to 'd') or 'n' if it should not be used.

For example: If you have two Quad Relay Bricklets connected to port A and port B respectively, you could call with ['a', 'b', 'n', 'n'].

Now the pins on the Quad Relay on port A are assigned to 0-3 and the pins on the Quad Relay on port B are assigned to 4-7. It is now possible to call setValue() and control two Bricklets at the same time.

public char[] getGroup()

Returns the group as set by setGroup()

public short getAvailableForGroup()

Returns a bitmask of ports that are available for grouping. For example the value 5 or 0b0101 means: Port A and port C are connected to Bricklets that can be grouped together.

public void setSelectedValues(int selectionMask, int valueMask)

Sets the output value with a bitmask, according to the selection mask. The bitmask is 16 bit long, true refers to a closed relay and false refers to an open relay.

For example: The values (3, 1) or (0b0011, 0b0001) will close the relay of pin 0, open the relay of pin 1 and leave the others untouched.

If no groups are used (see setGroup()), the pins correspond to the markings on the Industrial Quad Relay Bricklet.

If groups are used, the pins correspond to the element in the group. Element 1 in the group will get pins 0-3, element 2 pins 4-7, element 3 pins 8-11 and element 4 pins 12-15.

Running monoflop timers for the selected relays will be aborted if this function is called.

public short[] getAPIVersion()

Returns the version of the API definition (major, minor, revision) implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

public boolean getResponseExpected(short functionId)

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For listener configuration functions it is enabled by default too, but can be disabled by setResponseExpected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

See setResponseExpected() for the list of function ID constants available for this function.

public void setResponseExpected(short functionId, boolean responseExpected)

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and listener configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following function ID constants are available for this function:

  • BrickletIndustrialQuadRelay.FUNCTION_SET_VALUE = 1
  • BrickletIndustrialQuadRelay.FUNCTION_SET_MONOFLOP = 3
  • BrickletIndustrialQuadRelay.FUNCTION_SET_GROUP = 5
  • BrickletIndustrialQuadRelay.FUNCTION_SET_SELECTED_VALUES = 9
public void setResponseExpectedAll(boolean responseExpected)

Changes the response expected flag for all setter and listener configuration functions of this device at once.

public BrickletIndustrialQuadRelay.Identity getIdentity()

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c' or 'd'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

The returned object has the public member variables String uid, String connectedUid, char position, short[] hardwareVersion, short[] firmwareVersion and int deviceIdentifier.

Listeners

Listeners can be registered to receive time critical or recurring data from the device. The registration is done with add*Listener() functions of the device object.

The parameter is a listener class object, for example:

device.addExampleListener(new BrickletIndustrialQuadRelay.ExampleListener() {
    public void property(int value) {
        System.out.println("Value: " + value);
    }
});

The available listener classes with inherent methods to be overwritten are described below. It is possible to add several listeners and to remove them with the corresponding remove*Listener() function.

Note

Using listeners for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

public class BrickletIndustrialQuadRelay.MonoflopDoneListener()

This listener can be added with the addMonoflopDoneListener() function. An added listener can be removed with the removeMonoflopDoneListener() function.

public void monoflopDone(int selectionMask, int valueMask)

This listener is triggered whenever a monoflop timer reaches 0. The parameters contain the involved pins and the current value of the pins (the value after the monoflop).

Constants

public static final int BrickletIndustrialQuadRelay.DEVICE_IDENTIFIER

This constant is used to identify a Industrial Quad Relay Bricklet.

The getIdentity() function and the IPConnection.EnumerateListener listener of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

public static final String BrickletIndustrialQuadRelay.DEVICE_DISPLAY_NAME

This constant represents the human readable name of a Industrial Quad Relay Bricklet.