diff --git a/arduino-max485-epever-json-serial.ino b/arduino-max485-epever-json-serial.ino
index 37328b6..d255a4e 100644
--- a/arduino-max485-epever-json-serial.ino
+++ b/arduino-max485-epever-json-serial.ino
@@ -64,6 +64,9 @@
   TRACER => MAX485
   blue => B
   green => A
+
+  Put a 10K Resistor from D7 to GND. 
+  To enable two Controller Mode, add a Jumper from 5V to D7.
 */
 //#include <TracerRegisters.h> // empty library for potential future use
 
@@ -74,7 +77,8 @@
 // when having two solar controllers, set it to true, otherwise to false
 // it is important to set it to false when only having one solar controller
 // to avoid waiting for the timeout of the second controller
-bool twoController = true;
+bool twoController = false;
+int twoControllerBoolPin = 7;
 
 SoftwareSerial myserial(10, 11); // RX, TX
 SoftwareSerial myserial2(8, 9); // RX, TX
@@ -141,6 +145,16 @@ void postTransmission2()
 
 void setup()
 {
+
+  // set twoControllerBoolPin to Input
+  pinMode(twoControllerBoolPin, INPUT);
+
+  // check if twoController Mode is set (HIGH)
+  if(digitalRead(twoControllerBoolPin) == HIGH ) {
+    twoController = true;
+  }
+  
+  
   pinMode(MAX485_RE_NEG, OUTPUT);
   pinMode(MAX485_DE, OUTPUT);
   // Init in receive mode
@@ -234,7 +248,7 @@ void loop()
   //Serial.println();
   //Serial.write( '\r' );  // Carriage Return
   Serial.write( '\n' );  // EOL
-  delay(1000);
+  delay(5000);
 }