diff --git a/lib/sensor_pzem.c b/lib/sensor_pzem.c
index 9d1753a..daabb71 100644
--- a/lib/sensor_pzem.c
+++ b/lib/sensor_pzem.c
@@ -43,7 +43,7 @@
 static uint8_t rx_buffer[7] = {0}; /**< buffer for received response */
 static volatile uint8_t rx_i = 0; /**< current position of read received data */
 static uint8_t tx_buffer[7] = {0}; /**< buffer for request to transmit */
-static volatile uint8_t tx_i = 0; /**< current position if transmitted data */
+static volatile uint8_t tx_i = 0; /**< current position of transmitted data */
 
 volatile bool sensor_pzem_measurement_received = false;
 
@@ -133,6 +133,9 @@ struct sensor_pzem_measurement_t sensor_pzem_measurement_decode(void)
 		case SENSOR_PZEM_ENERGY:
 			measurement.value.power = ((uint32_t)rx_buffer[1]<<16)+((uint16_t)rx_buffer[2]<<8)+rx_buffer[3];
 			break;
+		case SENSOR_PZEM_ADDRESS:
+		case SENSOR_PZEM_ALARM:
+			break; // no value is returned
 		default:
 			measurement.valid = false; // unexpected type
 	}
diff --git a/lib/sensor_pzem.h b/lib/sensor_pzem.h
index dd7b381..952eef9 100644
--- a/lib/sensor_pzem.h
+++ b/lib/sensor_pzem.h
@@ -23,12 +23,14 @@
 /** a measurement response has been received */
 extern volatile bool sensor_pzem_measurement_received;
 
-/** measurements offered by electricity meter */
+/** measurements (and configurations) offered by electricity meter */
 enum sensor_pzem_measurement_type_t {
 	SENSOR_PZEM_VOLTAGE = 0,
 	SENSOR_PZEM_CURRENT = 1,
 	SENSOR_PZEM_POWER = 2,
 	SENSOR_PZEM_ENERGY = 3,
+	SENSOR_PZEM_ADDRESS = 4,
+	SENSOR_PZEM_ALARM = 5,
 	SENSOR_PZEM_MAX
 };