Iec21Port (j62056 2.2.0 API)

java.lang.Object
- org.openmuc.j62056.Iec21Port

```
public class Iec21Port
extends java.lang.Object
```
Represents a serial communication port that can be used to read meters using IEC 62056-21 modes A, B, C or D. Create and open a port using Iec21Port.Builder.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class Iec21Port.Builder
A builder for Iec21Ports.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Closes this communication port.
`java.io.DataInputStream`	`getInputStream()`
`java.io.DataOutputStream`	`getOutputStream()`
`org.openmuc.jrxtx.SerialPort`	`getSerialPort()`
`boolean`	`isClosed()`	Returns true if this port has been closed.
`void`	`listen(ModeDListener listener)`	Listen for mode D messages.
`DataMessage`	`read()`	Requests meter data and returns the response.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - getSerialPort
```
public final org.openmuc.jrxtx.SerialPort getSerialPort()
```
  - getOutputStream
```
public final java.io.DataOutputStream getOutputStream()
```
  - getInputStream
```
public final java.io.DataInputStream getInputStream()
```
  - close
```
public void close()
```
    Closes this communication port. Also closes the associated serial port, input stream and output stream.
    The port cannot be opened again but has to be recreated.
  - read
```
public DataMessage read()
                 throws java.io.IOException
```
    Requests meter data and returns the response.
    Requests a data message from the remote device using IEC 62056-21 Mode A, B or C. The data message received is parsed and returned. The returned data message also contains some information fields from the identification message sent by the meter.
    
    Returns:
    
    The response data message.
    
    Throws:
    
    java.io.IOException - if any kind of IO error occurs
  - isClosed
```
public boolean isClosed()
```
    Returns true if this port has been closed.
    
    Returns:
    
    true if this port has been closed
  - listen
```
public void listen(ModeDListener listener)
            throws java.io.IOException
```
    Listen for mode D messages.
    
    Parameters:
    
    listener - A listener for mode D messages
    
    Throws:
    
    java.io.IOException - throws IOException