diff --git a/src/VS1/VS1.h b/src/VS1/VS1.h
index c4d1146..872e85c 100644
--- a/src/VS1/VS1.h
+++ b/src/VS1/VS1.h
@@ -46,6 +46,7 @@ class VS1 {
 
   bool read(const Datapoint& datapoint);
   bool write(const Datapoint& datapoint, const VariantValue& value);
+  bool write(const Datapoint& datapoint, const uint8_t* data, uint8_t length);
 
   bool begin();
   void loop();
diff --git a/src/VS2/VS2.h b/src/VS2/VS2.h
index eee9875..294ad0b 100644
--- a/src/VS2/VS2.h
+++ b/src/VS2/VS2.h
@@ -46,6 +46,7 @@ class VS2 {
 
   bool read(const Datapoint& datapoint);
   bool write(const Datapoint& datapoint, const VariantValue& value);
+  bool write(const Datapoint& datapoint, const uint8_t* data, uint8_t length);
 
   bool begin();
   void loop();