diff --git a/ads1210.cpp b/ads1210.cpp
index 233c7b2..f1b342c 100644
--- a/ads1210.cpp
+++ b/ads1210.cpp
@@ -74,7 +74,7 @@ void ADS1210::exec() {
 		//Serial << "DOR4x8:  " << _HEX(res.in[3]) << " " << _HEX(res.in[2]) << " " << _HEX(res.in[1]) << " " << _HEX(res.in[0]) << endl;
 		//Serial << "DOR1x32: " << _HEX(res.out) << endl;
 
-		value = res.out;
+		value = (res.out & V_MASK);
 		
 		u = (((float)value) / ((float)V_MAX)) * U_REF;
 		rRaw = ((((float)V_MAX) / ((float)value)) - 1.0) * R_REF;
diff --git a/ads1210.h b/ads1210.h
index 8e3bcde..861e20d 100644
--- a/ads1210.h
+++ b/ads1210.h
@@ -75,6 +75,7 @@ private:
 	const uint32_t V_MAX = 0x3FFFFF;
 	const float R_REF = 3000.0;
 	
+	const uint32_t V_MASK = 0x3FFFF0;
 
 	uint8_t m_csPin;
 	uint8_t m_drdyPin;