diff --git a/src_main/core/pibytearray.h b/src_main/core/pibytearray.h
index f706b4ec..6851cfa1 100755
--- a/src_main/core/pibytearray.h
+++ b/src_main/core/pibytearray.h
@@ -109,13 +109,9 @@ public:
 
 	//! Add to the end byte array "data"
 	PIByteArray & append(const PIByteArray & data_) {uint ps = size(); enlarge(data_.size_s()); memcpy(data(ps), data_.data(), data_.size()); return *this;}
-	/*PIByteArray & operator <<(short v) {for (uint i = 0; i < sizeof(v); ++i) push_back(((uchar*)(&v))[i]); return *this;}
-	PIByteArray & operator <<(ushort v) {for (uint i = 0; i < sizeof(v); ++i) push_back(((uchar*)(&v))[i]); return *this;}
-	PIByteArray & operator <<(int v) {for (uint i = 0; i < sizeof(v); ++i) push_back(((uchar*)(&v))[i]); return *this;}
-	PIByteArray & operator <<(uint v) {for (uint i = 0; i < sizeof(v); ++i) push_back(((uchar*)(&v))[i]); return *this;}
-	PIByteArray & operator <<(llong v) {for (uint i = 0; i < sizeof(v); ++i) push_back(((uchar*)(&v))[i]); return *this;}
-	PIByteArray & operator <<(ullong v) {for (uint i = 0; i < sizeof(v); ++i) push_back(((uchar*)(&v))[i]); return *this;}*/
-	//PIByteArray & operator <<(const PIByteArray & v) {for (uint i = 0; i < v.size(); ++i) push_back(v[i]); return *this;}
+	
+	//! Add to the end "t"
+	PIByteArray & append(uchar t) {push_back(t); return *this;}
 
 	//! Returns plain 8-bit checksum
 	uchar checksumPlain8() const;