diff --git a/src/knx/dptconvert.cpp b/src/knx/dptconvert.cpp
index 9f05fb2..9b3ff29 100644
--- a/src/knx/dptconvert.cpp
+++ b/src/knx/dptconvert.cpp
@@ -87,6 +87,9 @@ int KNX_Decode_Value(uint8_t* payload, size_t payload_length, const Dpt& datatyp
         // DPT 26.* - Scene Info
         if (datatype.mainGroup == 26 && datatype.subGroup == 1 && datatype.index <= 1)
             return busValueToSceneInfo(payload, payload_length, datatype, value);
+        // DPT 27.001 - 32 Bit field
+        if (datatype.mainGroup == 27 && datatype.subGroup == 1 && !datatype.index)
+            return busValueToSigned32(payload, payload_length, datatype, value);
         // DPT 28.* - Unicode String
         if (datatype.mainGroup == 28 && datatype.subGroup == 1 && !datatype.index)
             return busValueToUnicode(payload, payload_length, datatype, value);
@@ -205,7 +208,10 @@ int KNX_Encode_Value(const KNXValue& value, uint8_t* payload, size_t payload_len
         return valueToBusValueDateTime(value, payload, payload_length, datatype);
     // DPT 26.* - Scene Info
     if (datatype.mainGroup == 26 && datatype.subGroup == 1 && datatype.index <= 1)
-        return valueToBusValueSceneInfo(value, payload, payload_length, datatype);
+        return valueToBusValueSceneInfo(value, payload, payload_length, datatype);     
+    // DPT 27.001 - 32 Bit Field
+    if (datatype.mainGroup == 27 && datatype.subGroup == 1 && !datatype.index)
+        return valueToBusValueUnsigned32(value, payload, payload_length, datatype);
     // DPT 28.* - Unicode String
     if (datatype.mainGroup == 28 && datatype.subGroup == 1 && !datatype.index)
         return valueToBusValueUnicode(value, payload, payload_length, datatype);
diff --git a/src/knx/tpuart_data_link_layer.cpp b/src/knx/tpuart_data_link_layer.cpp
index f75dd70..e70b58c 100644
--- a/src/knx/tpuart_data_link_layer.cpp
+++ b/src/knx/tpuart_data_link_layer.cpp
@@ -1205,19 +1205,19 @@ void TpUartDataLinkLayer::processRxQueue()
 void TpUartDataLinkLayer::pushByteToRxQueue(uint8_t byte)
 {
     _rxBuffer[_rxBufferFront] = byte;
-    _rxBufferFront = (_rxBufferFront + 1) % MAX_RX_QUEUE_BYTES;
+    _rxBufferFront = (_rxBufferFront + 1) % (MAX_RX_QUEUE_BYTES);
 }
 
 uint8_t TpUartDataLinkLayer::pullByteFromRxQueue()
 {
     uint8_t byte = _rxBuffer[_rxBufferRear];
-    _rxBufferRear = (_rxBufferRear + 1) % MAX_RX_QUEUE_BYTES;
+    _rxBufferRear = (_rxBufferRear + 1) % (MAX_RX_QUEUE_BYTES);
     return byte;
 }
 
 uint16_t TpUartDataLinkLayer::availableInRxQueue()
 {
-    return ((_rxBufferFront == _rxBufferRear) ? MAX_RX_QUEUE_BYTES : (((MAX_RX_QUEUE_BYTES - _rxBufferFront) + _rxBufferRear) % MAX_RX_QUEUE_BYTES)) - 1;
+    return ((_rxBufferFront == _rxBufferRear) ? (MAX_RX_QUEUE_BYTES) : ((((MAX_RX_QUEUE_BYTES) - _rxBufferFront) + _rxBufferRear) % (MAX_RX_QUEUE_BYTES))) - 1;
 }
 #endif