diff --git a/src/main.cpp b/src/main.cpp
index adcdc12..8b8a0fc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -15,7 +15,7 @@
 
 // Register Arrays für Modbus
 uint8_t ReadCoilRegister[] = {0, 1, 2};
-uint8_t output_pins[] = {0,1};
+uint8_t output_pins[] = {0,1,2,3};
 uint8_t ReadInputRegister[] = {0,1,2,3,4,5,6,7};
 uint8_t HoldingRegister[] = {0};
 
@@ -46,12 +46,24 @@ uint8_t writeDigitalOut(uint8_t fc, uint16_t address, uint16_t length) {
     }
 
     for (uint16_t i = 0; i < length; i++) {
-        if (slave.readCoilFromBuffer(i) == 1) {
-            digitalWrite(OutPutPin, HIGH);
-        } else {
-            digitalWrite(OutPutPin, LOW);
-        }
+    switch (i) {
+        case 0:
+            digitalWrite(OutPutPin, slave.readCoilFromBuffer(i) == 1 ? HIGH : LOW);
+            break;
+        case 1:
+            
+            break;
+        case 2:
+            
+            break;
+        case 3:
+            digitalWrite(OutPutPin, slave.readCoilFromBuffer(i) == 1 ? HIGH : LOW);
+            break;
+        default:
+            // Optional: Handle cases where 'i' is greater than 3, if necessary
+            break;
     }
+}
     return STATUS_OK;
 }