Delphi/Lazarus - Industrial Analog Out Bricklet

This is the description of the Delphi/Lazarus API bindings for the Industrial Analog Out Bricklet. General information and technical specifications for the Industrial Analog Out Bricklet are summarized in its hardware description.

An installation guide for the Delphi/Lazarus API bindings is part of their general description.

Examples

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

Simple Current

Download (ExampleSimpleCurrent.pas)

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program ExampleSimpleCurrent;

{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}

uses
  SysUtils, IPConnection, BrickletIndustrialAnalogOut;

type
  TExample = class
  private
    ipcon: TIPConnection;
    iao: TBrickletIndustrialAnalogOut;
  public
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your Industrial Analog Out Bricklet }

var
  e: TExample;

procedure TExample.Execute;
begin
  { Create IP connection }
  ipcon := TIPConnection.Create;

  { Create device object }
  iao := TBrickletIndustrialAnalogOut.Create(UID, ipcon);

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

  { Set output current to 4.5mA }
  iao.SetCurrent(4500);
  iao.Enable;

  WriteLn('Press key to exit');
  ReadLn;
  iao.Disable;
  ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;

begin
  e := TExample.Create;
  e.Execute;
  e.Destroy;
end.

Simple Voltage

Download (ExampleSimpleVoltage.pas)

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program ExampleSimpleVoltage;

{$ifdef MSWINDOWS}{$apptype CONSOLE}{$endif}
{$ifdef FPC}{$mode OBJFPC}{$H+}{$endif}

uses
  SysUtils, IPConnection, BrickletIndustrialAnalogOut;

type
  TExample = class
  private
    ipcon: TIPConnection;
    iao: TBrickletIndustrialAnalogOut;
  public
    procedure Execute;
  end;

const
  HOST = 'localhost';
  PORT = 4223;
  UID = 'XYZ'; { Change XYZ to the UID of your Industrial Analog Out Bricklet }

var
  e: TExample;

procedure TExample.Execute;
begin
  { Create IP connection }
  ipcon := TIPConnection.Create;

  { Create device object }
  iao := TBrickletIndustrialAnalogOut.Create(UID, ipcon);

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

  { Set output voltage to 3.3V }
  iao.SetVoltage(3300);
  iao.Enable;

  WriteLn('Press key to exit');
  ReadLn;
  iao.Disable;
  ipcon.Destroy; { Calls ipcon.Disconnect internally }
end;

begin
  e := TExample.Create;
  e.Execute;
  e.Destroy;
end.

API

Since Delphi does not support multiple return values directly, we use the out keyword to return multiple values from a function.

All functions and procedures listed below are thread-safe.

Basic Functions

constructor TBrickletIndustrialAnalogOut.Create(const uid: string; ipcon: TIPConnection)

Creates an object with the unique device ID uid:

industrialAnalogOut := TBrickletIndustrialAnalogOut.Create('YOUR_DEVICE_UID', ipcon);

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

procedure TBrickletIndustrialAnalogOut.Enable

Enables the output of voltage and current.

The default is disabled.

procedure TBrickletIndustrialAnalogOut.Disable

Disables the output of voltage and current.

The default is disabled.

function TBrickletIndustrialAnalogOut.IsEnabled: boolean

Returns true if output of voltage and current is enabled, false otherwise.

procedure TBrickletIndustrialAnalogOut.SetVoltage(const voltage: word)

Sets the output voltage in mV.

The output voltage and output current are linked. Changing the output voltage also changes the output current.

function TBrickletIndustrialAnalogOut.GetVoltage: word

Returns the voltage as set by SetVoltage.

procedure TBrickletIndustrialAnalogOut.SetCurrent(const current: word)

Sets the output current in µA.

The output current and output voltage are linked. Changing the output current also changes the output voltage.

function TBrickletIndustrialAnalogOut.GetCurrent: word

Returns the current as set by SetCurrent.

Advanced Functions

procedure TBrickletIndustrialAnalogOut.SetConfiguration(const voltageRange: byte; const currentRange: byte)

Configures the voltage and current range.

Possible voltage ranges are:

  • 0V to 5V
  • 0V to 10V (default)

Possible current ranges are:

  • 4mA to 20mA (default)
  • 0mA to 20mA
  • 0mA to 24mA

The resolution will always be 12 bit. This means, that the precision is higher with a smaller range.

The following constants are available for this function:

  • BRICKLET_INDUSTRIAL_ANALOG_OUT_VOLTAGE_RANGE_0_TO_5V = 0
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_VOLTAGE_RANGE_0_TO_10V = 1
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_CURRENT_RANGE_4_TO_20MA = 0
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_CURRENT_RANGE_0_TO_20MA = 1
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_CURRENT_RANGE_0_TO_24MA = 2
procedure TBrickletIndustrialAnalogOut.GetConfiguration(out voltageRange: byte; out currentRange: byte)

Returns the configuration as set by SetConfiguration.

The following constants are available for this function:

  • BRICKLET_INDUSTRIAL_ANALOG_OUT_VOLTAGE_RANGE_0_TO_5V = 0
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_VOLTAGE_RANGE_0_TO_10V = 1
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_CURRENT_RANGE_4_TO_20MA = 0
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_CURRENT_RANGE_0_TO_20MA = 1
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_CURRENT_RANGE_0_TO_24MA = 2
function TBrickletIndustrialAnalogOut.GetAPIVersion: array [0..2] of byte

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.

function TBrickletIndustrialAnalogOut.GetResponseExpected(const functionId: byte): boolean

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 callback 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.

procedure TBrickletIndustrialAnalogOut.SetResponseExpected(const functionId: byte; const responseExpected: boolean)

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 callback 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:

  • BRICKLET_INDUSTRIAL_ANALOG_OUT_FUNCTION_ENABLE = 1
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_FUNCTION_DISABLE = 2
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_FUNCTION_SET_VOLTAGE = 4
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_FUNCTION_SET_CURRENT = 6
  • BRICKLET_INDUSTRIAL_ANALOG_OUT_FUNCTION_SET_CONFIGURATION = 8
procedure TBrickletIndustrialAnalogOut.SetResponseExpectedAll(const responseExpected: boolean)

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

procedure TBrickletIndustrialAnalogOut.GetIdentity(out uid: string; out connectedUid: string; out position: char; out hardwareVersion: array [0..2] of byte; out firmwareVersion: array [0..2] of byte; out deviceIdentifier: word)

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.

Constants

const BRICKLET_INDUSTRIAL_ANALOG_OUT_DEVICE_IDENTIFIER

This constant is used to identify a Industrial Analog Out Bricklet.

The GetIdentity function and the OnEnumerate callback of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

const BRICKLET_INDUSTRIAL_ANALOG_OUT_DEVICE_DISPLAY_NAME

This constant represents the human readable name of a Industrial Analog Out Bricklet.