Add rs485ctrl disable

pom.xml

@@ -77,7 +77,7 @@
         <dependency>
             <groupId>com.fazecast</groupId>
             <artifactId>jSerialComm</artifactId>
-            <version>2.10.4</version>
+            <version>2.11.4</version>
         </dependency>
 
         <dependency>

src/main/java/com/ghgande/j2mod/modbus/net/SerialConnection.java

@@ -53,7 +53,6 @@ public class SerialConnection extends AbstractSerialConnection {
     private SerialPort serialPort;
     private InputStream inputStream;
     private int timeout = Modbus.DEFAULT_TIMEOUT;
-    private boolean disablePortConfiguration = false;
 
     /**
      * Default constructor
@@ -167,8 +166,8 @@ private void applyConnectionParameters() {
 
         // Set connection parameters, if set fails return parameters object to original state
         if (serialPort != null) {
-            if (this.disablePortConfiguration) {
-                serialPort.disablePortConfiguration();
+            if (parameters.isRs485ControlDisabled()) {
+                serialPort.disableRs485ModeControl();
             }
             serialPort.setComPortParameters(parameters.getBaudRate(), parameters.getDatabits(), parameters.getStopbits(), parameters.getParity());
             serialPort.setFlowControl(parameters.getFlowControlIn() | parameters.getFlowControlOut());
@@ -278,19 +277,4 @@ public Set<String> getCommPorts() {
         }
         return returnValue;
     }
-
-    /**
-     * Disables the library from calling any of the underlying device driver
-     * configuration methods.
-     *
-     * <p>
-     * This function should never be called except in very specific cases involving
-     * USB-to-Serial converters with buggy device drivers.
-     * </p>
-     *
-     * @see SerialPort#disablePortConfiguration()
-     */
-    public void disablePortConfiguration() {
-        disablePortConfiguration = true;
-    }
 }

src/main/java/com/ghgande/j2mod/modbus/util/SerialParameters.java

@@ -33,6 +33,7 @@
  */
 public class SerialParameters {
 
+    private static final boolean DEFAULT_RS485_DISABLE_CONTROL = false;
     private static final boolean DEFAULT_RS485_MODE = false;
     private static final boolean DEFAULT_RS485_TX_ENABLE_ACTIVE_HIGH = true;
     private static final boolean DEFAULT_RS485_ENABLE_TERMINATION = false;
@@ -57,6 +58,7 @@ public class SerialParameters {
     private boolean rs485RxDuringTx;
     private int rs485DelayBeforeTxMicroseconds;
     private int rs485DelayAfterTxMicroseconds;
+    private boolean rs485DisableControl;
 
     /**
      * Constructs a new <tt>SerialParameters</tt> instance with
@@ -80,6 +82,7 @@ public SerialParameters() {
         rs485TxEnableActiveHigh = DEFAULT_RS485_TX_ENABLE_ACTIVE_HIGH;
         rs485DelayBeforeTxMicroseconds = DEFAULT_RS485_DELAY_BEFORE_TX_MICROSECONDS;
         rs485DelayAfterTxMicroseconds = DEFAULT_RS485_DELAY_AFTER_TX_MICROSECONDS;
+        rs485DisableControl = DEFAULT_RS485_DISABLE_CONTROL;
     }
 
     /**
@@ -392,6 +395,29 @@ public void setDatabits(String databits) {
         }
     }
 
+    /**
+     * Disables RS-485 control signals management.
+     * <p>
+     * <i>Please note that this is only effective on Linux.</i>
+     * <p>
+     * This function forces RS-485 mode to stay untouched,
+     * regardless of the current setting of RS-485 mode.
+     * <p>
+     * This function is necessary for Linux drivers that don't handle TIOCGRS485 properly.
+     */
+    public void disableRs485Control() {
+        this.rs485DisableControl = true;
+    }
+
+    /**
+     * Returns whether RS-485 control signals management is disabled.
+     *
+     * @return true if RS-485 control signals management is disabled.
+     */
+    public boolean isRs485ControlDisabled() {
+        return this.rs485DisableControl;
+    }
+
     /**
      * Returns the number of data bits as <tt>String</tt>.
      *