Wie rufe ich eine Funktion auf?

Ich habe folgende Funktion:

/// @notice send `_value` token to `_to` from `msg.sender`
  /// @notice send `Pl_value` token to `_to` from `msg.sender`
  /// @param _to The address of the recipient
  /// @param _value The amount of token to be transferred
  /// @param Pl_value The payload to be transferred
  /// @return Whether the transfer was successful or not
  function transfer(address _from, address _to, uint256 _value, string Pl_value) public returns (bool) {
    require(_to != address(0));

    // SafeMath.sub will throw if there is not enough balance.
    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);

    Payload[_to] = Pl_value;

    return true;
  }

}

Und ich erstelle eine Instanz aus meinem Vertrag wie folgt:

var contractInstance = new web3.eth.Contract(abi, 'address-of-contract');

Wie kann ich diese Funktion aufrufen über:

contractInstance.methods.

Was ist seine Syntax genau? (Ich mache es über die Eingabeaufforderung und das Terminal)

Hier ist die gesamte .sol-Datei:

import './SafeMath.sol';

contract BasicToken {

  // Using safe math library for all uint256 operations
  using SafeMath for uint256;

  // Total supply of token
  uint256 public totalSupply;

  // Balances for each account
  mapping(address => uint256) balances;

  mapping(address => string) Payload;

  /// @param _owner The address from which the balance will be retrieved
  /// @return The balance
  function balanceOf(address _owner) constant returns (uint256 balance) {
    return balances[_owner];
  }

  /// @param _owner The address from which the balance will be retrieved
  /// @return The payload
  function PayloadOf(address _owner) constant returns (string payload) {
    return Payload[_owner];
  }

  /// @notice send `_value` token to `_to` from `msg.sender`
  /// @notice send `Pl_value` token to `_to` from `msg.sender`
  /// @param _to The address of the recipient
  /// @param _value The amount of token to be transferred
  /// @param Pl_value The payload to be transferred
  /// @return Whether the transfer was successful or not
  function transfer(address _from, address _to, uint256 _value, string Pl_value) public returns (bool) {
    require(_to != address(0));

    // SafeMath.sub will throw if there is not enough balance.
    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);

    Payload[_to] = Pl_value;

    return true;
  }

}