diff --git a/SoftRS485.cpp b/SoftRS485.cpp
index d512761..1f7ed4f 100644
--- a/SoftRS485.cpp
+++ b/SoftRS485.cpp
@@ -12,7 +12,7 @@
 // Pins
 int _RO, _RE, _DE, _DI;
 
-const long _pulse_len = 616;
+const long _pulse_len = 1000;
 const long _break = _pulse_len * 20;
 boolean _line = LOW;     // current state of the transmission line
 long _last_flip = 0;     // timestamp since last flip of line state
@@ -29,7 +29,12 @@ long _diff = 0;          // time difference between last flips
 long _now = 0;           // current time
 long _count = 0;         // helper for bit iteration
 
+
+#if defined CONTROLLINO_MAXI
+ISR(PCINT1_vect){
+#else
 void interrupt485(){
+#endif
     _line = !digitalRead(_RO); // HIGH level = logical zero and vice versa
     _now = micros();           // get current time
     _diff = _now - _last_flip; // duration of the _previous_ bit
@@ -85,7 +90,6 @@ void interrupt485(){
 
 
 
-
 void init485(int RO, int nRE, int DE, int DI){
     _RO=RO;  // save the pin numbers
     _RE=nRE;
@@ -123,7 +127,18 @@ void init485(int RO, int nRE, int DE, int DI){
     pinMode(_DI,OUTPUT);
     digitalWrite(_DI,LOW); // output line = LOW
 
-    attachInterrupt(digitalPinToInterrupt(_RO),interrupt485,CHANGE);
+    #if defined CONTROLLINO_MAXI
+        Serial.println("Setting up for Controllino MAXI!");
+        // https://forum.arduino.cc/t/enable-interrupt/259014/2
+        // pin change interrupt enable (PCIE) port 1
+        // in pin change interrupt control register (PCICR)
+        PCICR |= (1<<PCIE1);
+        // enable bit for pin change interrupt 9 (PCINT9)
+        // in pin change mask 1
+        PCMSK1 |= (1<<PCINT9);
+    #else
+        attachInterrupt(digitalPinToInterrupt(_RO),interrupt485,CHANGE);
+    #endif
     _last_flip = micros();
 }