diff --git a/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/client/SerialPortClientTransport.java b/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/client/SerialPortClientTransport.java
index 0dc6eab..a7b8c24 100644
--- a/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/client/SerialPortClientTransport.java
+++ b/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/client/SerialPortClientTransport.java
@@ -46,6 +46,15 @@ public SerialPortClientTransport(SerialPortTransportConfig config) {
     executionQueue = new ExecutionQueue(config.executor());
   }
 
+  /**
+   * Return the underlying {@link SerialPort} used by this transport.
+   *
+   * @return the configured {@link SerialPort} instance.
+   */
+  public SerialPort getSerialPort() {
+    return serialPort;
+  }
+
   @Override
   public synchronized CompletableFuture<Void> connect() {
     if (serialPort.isOpen()) {
diff --git a/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/server/SerialPortServerTransport.java b/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/server/SerialPortServerTransport.java
index d64cd50..b882035 100644
--- a/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/server/SerialPortServerTransport.java
+++ b/modbus-serial/src/main/java/com/digitalpetri/modbus/serial/server/SerialPortServerTransport.java
@@ -54,6 +54,15 @@ public SerialPortServerTransport(SerialPortTransportConfig config) {
     executionQueue = new ExecutionQueue(config.executor());
   }
 
+  /**
+   * Return the underlying {@link SerialPort} used by this transport.
+   *
+   * @return the configured {@link SerialPort} instance.
+   */
+  public SerialPort getSerialPort() {
+    return serialPort;
+  }
+
   @Override
   public CompletionStage<Void> bind() {
     if (serialPort.isOpen()) {