diff --git a/src/RS485.cpp b/src/RS485.cpp
index fe39c96..61b4f36 100644
--- a/src/RS485.cpp
+++ b/src/RS485.cpp
@@ -178,4 +178,9 @@ void RS485Class::setPins(int txPin, int dePin, int rePin)
   _rePin = rePin;
 }
 
+void RS485Class::setSerial(HardwareSerial* hwSerial)
+{
+  _serial = hwSerial;
+}
+
 RS485Class RS485(SERIAL_PORT_HARDWARE, RS485_DEFAULT_TX_PIN, RS485_DEFAULT_DE_PIN, RS485_DEFAULT_RE_PIN);
diff --git a/src/RS485.h b/src/RS485.h
index d1c3ec4..0669181 100644
--- a/src/RS485.h
+++ b/src/RS485.h
@@ -66,6 +66,7 @@ class RS485Class : public Stream {
     void sendBreakMicroseconds(unsigned int duration);
 
     void setPins(int txPin, int dePin, int rePin);
+    void setSerial(HardwareSerial* hwSerial);
 
   private:
     HardwareSerial* _serial;