diff --git a/mk2driver/mk2.go b/mk2driver/mk2.go
index 5c7d3b8..e8b7da9 100644
--- a/mk2driver/mk2.go
+++ b/mk2driver/mk2.go
@@ -49,7 +49,7 @@ const (
 	acL1InfoFrame  = 0x08
 	dcInfoFrame    = 0x0C
 	setTargetFrame = 0x41
-	infoReqFrame   = 0x46
+	infoReqFrame   = 0x46 //F
 	ledFrame       = 0x4C
 	vFrame         = 0x56
 	winmonFrame    = 0x57
@@ -358,10 +358,10 @@ func (m *mk2Ser) dcDecode(frame []byte) {
 
 // Decodes AC frame.
 func (m *mk2Ser) acDecode(frame []byte) {
-	m.info.InVoltage = m.applyScaleAndSign(frame[5:7], ramVarVMains)
-	m.info.InCurrent = m.applyScaleAndSign(frame[7:9], ramVarIMains)
-	m.info.OutVoltage = m.applyScaleAndSign(frame[9:11], ramVarVInverter)
-	m.info.OutCurrent = m.applyScaleAndSign(frame[11:13], ramVarIInverter)
+	m.info.InVoltage = m.applyScale(getSigned(frame[5:7]), ramVarVMains)
+	m.info.InCurrent = m.applyScale(getSigned(frame[7:9]), ramVarIMains)
+	m.info.OutVoltage = m.applyScale(getSigned(frame[9:11]), ramVarVInverter)
+	m.info.OutCurrent = m.applyScale(getSigned(frame[11:13]), ramVarIInverter)
 
 	if frame[13] == 0xff {
 		m.info.InFrequency = 0
diff --git a/mk2driver/mk2_test.go b/mk2driver/mk2_test.go
index 7326e20..f96a7e8 100644
--- a/mk2driver/mk2_test.go
+++ b/mk2driver/mk2_test.go
@@ -33,7 +33,7 @@ var knownWrites = []byte{
 var writeBuffer = bytes.NewBuffer(nil)
 
 const (
-	testEpsilon = 0.00000001
+	testDelta = 0.00000001
 )
 
 type testIo struct {
@@ -50,62 +50,162 @@ func NewIOStub(readBuffer []byte) io.ReadWriter {
 
 // Test a know sequence as reference as extracted from Mk2
 func TestSync(t *testing.T) {
-	knownReadBuffer := []byte{
-		//Len  Cmd
-		0x04, 0xff, 0x41, 0x01, 0x00, 0xbb, 0x07, 0xff, 0x56, 0x96, 0x3e, 0x11, 0x00, 0x00, 0xbf,
-		0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
-		0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x00, 0x00, 0xa1,
-		0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
-		0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
-		0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
-		0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x00, 0x00, 0xa1,
-		0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
-		0x08, 0xff, 0x57, 0x8e, 0x57, 0x78, 0x8f, 0x00, 0x01, 0xb5,
-		0x08, 0xff, 0x57, 0x8e, 0x2f, 0x7c, 0x8f, 0x00, 0x00, 0xda,
-		0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x00, 0x00, 0xa1,
-		0x08, 0xff, 0x57, 0x8e, 0x04, 0x00, 0x8f, 0x00, 0x80, 0x01,
-		0x08, 0xff, 0x57, 0x8e, 0x01, 0x00, 0x8f, 0x00, 0x80, 0x04,
-		0x08, 0xff, 0x57, 0x8e, 0x02, 0x00, 0x8f, 0x00, 0x80, 0x03,
-		0x08, 0xff, 0x57, 0x8e, 0x38, 0x7f, 0x8f, 0x00, 0x00, 0xce,
-		0x07, 0xff, 0x56, 0x96, 0x3e, 0x11, 0x00, 0x00, 0xbf,
-		0x0f, 0x20, 0xf3, 0x00, 0xc8, 0x02, 0x0c, 0xa1, 0x05, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x88, 0xb2,
-		0x0f, 0x20, 0x01, 0x01, 0xca, 0x09, 0x08, 0xaa, 0x58, 0xab, 0x00, 0xaa, 0x58, 0x9a, 0x00, 0xc3, 0xe8,
-		0x06, 0xff, 0x4c, 0x03, 0x00, 0x00, 0x00, 0xac,
-		0x05, 0xff, 0x57, 0x85, 0xc8, 0x00, 0x58,
+	tests := []struct {
+		name            string
+		knownReadBuffer []byte
+		knownWrites     []byte
+		result          Mk2Info
+	}{
+		{
+			name: "basic",
+			knownReadBuffer: []byte{
+				//Len  Cmd
+				0x04, 0xff, 0x41, 0x01, 0x00, 0xbb,
+				0x07, 0xff, 0x56, 0x96, 0x3e, 0x11, 0x00, 0x00, 0xbf,
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
+				0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x00, 0x00, 0xa1,
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
+				0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x00, 0x00, 0xa1,
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a,
+				0x08, 0xff, 0x57, 0x8e, 0x57, 0x78, 0x8f, 0x00, 0x01, 0xb5,
+				0x08, 0xff, 0x57, 0x8e, 0x2f, 0x7c, 0x8f, 0x00, 0x00, 0xda,
+				0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x00, 0x00, 0xa1,
+				0x08, 0xff, 0x57, 0x8e, 0x04, 0x00, 0x8f, 0x00, 0x80, 0x01,
+				0x08, 0xff, 0x57, 0x8e, 0x01, 0x00, 0x8f, 0x00, 0x80, 0x04,
+				0x08, 0xff, 0x57, 0x8e, 0x02, 0x00, 0x8f, 0x00, 0x80, 0x03,
+				0x08, 0xff, 0x57, 0x8e, 0x38, 0x7f, 0x8f, 0x00, 0x00, 0xce,
+				0x07, 0xff, 0x56, 0x96, 0x3e, 0x11, 0x00, 0x00, 0xbf,
+				0x0f, 0x20, 0xf3, 0x00, 0xc8, 0x02, 0x0c, 0xa1, 0x05, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x88, 0xb2,
+				0x0f, 0x20, 0x01, 0x01, 0xca, 0x09, 0x08, 0xaa, 0x58, 0xab, 0x00, 0xaa, 0x58, 0x9a, 0x00, 0xc3, 0xe8,
+				0x06, 0xff, 0x4c, 0x03, 0x00, 0x00, 0x00, 0xac,
+				0x05, 0xff, 0x57, 0x85, 0xc8, 0x00, 0x58,
+			},
+			knownWrites: []byte{
+				0x04, 0xff, 0x41, 0x01, 0x00, 0xbb,
+				0x05, 0xff, 0x57, 0x36, 0x00, 0x00, 0x6f,
+				0x05, 0xff, 0x57, 0x36, 0x01, 0x00, 0x6e,
+				0x05, 0xff, 0x57, 0x36, 0x02, 0x00, 0x6d,
+				0x05, 0xff, 0x57, 0x36, 0x03, 0x00, 0x6c,
+				0x05, 0xff, 0x57, 0x36, 0x04, 0x00, 0x6b,
+				0x05, 0xff, 0x57, 0x36, 0x05, 0x00, 0x6a,
+				0x05, 0xff, 0x57, 0x36, 0x06, 0x00, 0x69,
+				0x05, 0xff, 0x57, 0x36, 0x07, 0x00, 0x68,
+				0x05, 0xff, 0x57, 0x36, 0x08, 0x00, 0x67,
+				0x05, 0xff, 0x57, 0x36, 0x09, 0x00, 0x66,
+				0x05, 0xff, 0x57, 0x36, 0x0a, 0x00, 0x65,
+				0x05, 0xff, 0x57, 0x36, 0x0b, 0x00, 0x64,
+				0x05, 0xff, 0x57, 0x36, 0x0c, 0x00, 0x63,
+				0x05, 0xff, 0x57, 0x36, 0x0d, 0x00, 0x62,
+				0x03, 0xff, 0x46, 0x00, 0xb8,
+				0x03, 0xff, 0x46, 0x01, 0xb7,
+				0x02, 0xff, 0x4c, 0xb3,
+				0x05, 0xff, 0x57, 0x30, 0x0d, 0x00, 0x68,
+			},
+			result: Mk2Info{
+				Version:      uint32(2736),
+				BatVoltage:   14.41,
+				BatCurrent:   -0.4,
+				InVoltage:    226.98,
+				InCurrent:    1.71,
+				InFrequency:  50.10256410256411,
+				OutVoltage:   226.980,
+				OutCurrent:   1.54,
+				OutFrequency: 50.025510204081634,
+				ChargeState:  1,
+				LEDs: map[Led]LEDstate{
+					LedMain:        LedOn,
+					LedAbsorption:  LedOn,
+					LedBulk:        LedOff,
+					LedFloat:       LedOff,
+					LedInverter:    LedOff,
+					LedOverload:    LedOff,
+					LedLowBattery:  LedOff,
+					LedTemperature: LedOff,
+				},
+			},
+		},
+		{
+			name: "multiplus24/3000",
+			knownReadBuffer: []byte{
+				//Len  Cmd
+				0x04, 0xff, 0x41, 0x01, 0x00, 0xbb,
+				0x07, 0xff, 0x56, 0x98, 0x3e, 0x11, 0x00, 0x00, 0xbd, // version
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x0, 0x0, 0x6a, // scale 0
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x0, 0x0, 0x6a, // scale 1
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x0, 0x0, 0x6a, // scale 2
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x0, 0x0, 0x6a, // scale 3
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x0, 0x0, 0x6a, // scale 4
+				0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x0, 0x0, 0xa1, // scale 5
+				0x08, 0xff, 0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x0, 0x0, 0x6a, // scale 6
+				0x08, 0xff, 0x57, 0x8e, 0x57, 0x78, 0x8f, 0x0, 0x1, 0xb5, // scale 7
+				0x08, 0xff, 0x57, 0x8e, 0x2f, 0x7c, 0x8f, 0x0, 0x0, 0xda, // scale 8
+				0x08, 0xff, 0x57, 0x8e, 0x64, 0x80, 0x8f, 0x0, 0x0, 0xa1, //scale 9
+				0x08, 0xff, 0x57, 0x8e, 0x4, 0x0, 0x8f, 0x0, 0x80, 0x1, // scale 10
+				0x08, 0xff, 0x57, 0x8e, 0x1, 0x0, 0x8f, 0x0, 0x80, 0x4, // scale 11
+				0x08, 0xff, 0x57, 0x8e, 0x6, 0x0, 0x8f, 0x0, 0x80, 0xff, // scale 12
+				0x08, 0xff, 0x57, 0x8e, 0x38, 0x7f, 0x8f, 0x0, 0x0, 0xce, // scale 13
+				0x07, 0xff, 0x56, 0x98, 0x3e, 0x11, 0x0, 0x0, 0xbd, // version
+				0x0f, 0x20, 0xb6, 0x89, 0x6d, 0xb7, 0xc, 0x4e, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x88, 0x82, // dc info
+				0x0f, 0x20, 0x1, 0x1, 0x6d, 0xb7, 0x8, 0x77, 0x5b, 0x21, 0x0, 0x77, 0x5b, 0xfe, 0xff, 0xc3, 0x1e, // ac info
+				0x08, 0xff, 0x4c, 0x9, 0x0, 0x0, 0x0, 0x3, 0x0, 0xa1,
+				0x05, 0xff, 0x57, 0x85, 0xc8, 0x0, 0x58,
+			},
+			knownWrites: []byte{},
+			result: Mk2Info{
+				Version:      0xac0,
+				BatVoltage:   26.38,
+				BatCurrent:   0,
+				InVoltage:    234.15,
+				InCurrent:    0.33,
+				InFrequency:  50.1025641025641,
+				OutVoltage:   234.15,
+				OutCurrent:   -0.02,
+				OutFrequency: 50.025510204081634,
+				ChargeState:  1,
+				LEDs: map[Led]LEDstate{
+					LedMain:        LedOn,
+					LedAbsorption:  LedOff,
+					LedBulk:        LedOff,
+					LedFloat:       LedOn,
+					LedInverter:    LedOff,
+					LedOverload:    LedOff,
+					LedLowBattery:  LedOff,
+					LedTemperature: LedOff,
+				},
+			},
+		},
 	}
 
-	expectedLEDs := map[Led]LEDstate{
-		LedMain:        LedOn,
-		LedAbsorption:  LedOn,
-		LedBulk:        LedOff,
-		LedFloat:       LedOff,
-		LedInverter:    LedOff,
-		LedOverload:    LedOff,
-		LedLowBattery:  LedOff,
-		LedTemperature: LedOff,
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			testIO := NewIOStub(tt.knownReadBuffer)
+			mk2, err := NewMk2Connection(testIO)
+			assert.NoError(t, err, "Could not open MK2")
+
+			event := <-mk2.C()
+			mk2.Close()
+
+			if len(tt.knownWrites) > 0 {
+				assert.Equal(t, 0, bytes.Compare(writeBuffer.Bytes(), knownWrites), "Expected writes did not match received writes")
+			}
+			assert.True(t, event.Valid, "data not valid")
+			assert.Equal(t, tt.result.Version, event.Version, "Invalid version decoded")
+			assert.Equal(t, 0, len(event.Errors), "Reported errors not empty")
+			assert.Equal(t, tt.result.LEDs, event.LEDs, "Reported LEDs incorrect")
+
+			assert.InDelta(t, tt.result.BatVoltage, event.BatVoltage, testDelta, "BatVoltage conversion failed")
+			assert.InDelta(t, tt.result.BatCurrent, event.BatCurrent, testDelta, "BatCurrent conversion failed")
+			assert.InDelta(t, tt.result.InVoltage, event.InVoltage, testDelta, "InVoltage conversion failed")
+			assert.InDelta(t, tt.result.InCurrent, event.InCurrent, testDelta, "InCurrent conversion failed")
+			assert.InDelta(t, tt.result.InFrequency, event.InFrequency, testDelta, "InFrequency conversion failed")
+			assert.InDelta(t, tt.result.OutVoltage, event.OutVoltage, testDelta, "OutVoltage conversion failed")
+			assert.InDelta(t, tt.result.OutCurrent, event.OutCurrent, testDelta, "OutCurrent conversion failed")
+			assert.InDelta(t, tt.result.OutFrequency, event.OutFrequency, testDelta, "OutFrequency conversion failed")
+			assert.InDelta(t, tt.result.ChargeState, event.ChargeState, testDelta, "ChargeState conversion failed")
+		})
 	}
-	testIO := NewIOStub(knownReadBuffer)
-	mk2, err := NewMk2Connection(testIO)
-	assert.NoError(t, err, "Could not open MK2")
-
-	event := <-mk2.C()
-	mk2.Close()
-
-	assert.Equal(t, 0, bytes.Compare(writeBuffer.Bytes(), knownWrites), "Expected writes did not match received writes")
-	assert.True(t, event.Valid, "data not valid")
-	assert.Equal(t, uint32(2736), event.Version, "Invalid version decoded")
-	assert.Equal(t, 0, len(event.Errors), "Reported errors not empty")
-	assert.Equal(t, expectedLEDs, event.LEDs, "Reported LEDs incorrect")
-
-	assert.InEpsilon(t, 14.41, event.BatVoltage, testEpsilon, "BatVoltage conversion failed")
-	assert.InEpsilon(t, -0.4, event.BatCurrent, testEpsilon, "BatCurrent conversion failed")
-	assert.InEpsilon(t, 226.98, event.InVoltage, testEpsilon, "InVoltage conversion failed")
-	assert.InEpsilon(t, 1.71, event.InCurrent, testEpsilon, "InCurrent conversion failed")
-	assert.InEpsilon(t, 50.10256410256411, event.InFrequency, testEpsilon, "InFrequency conversion failed")
-	assert.InEpsilon(t, 226.980, event.OutVoltage, testEpsilon, "OutVoltage conversion failed")
-	assert.InEpsilon(t, 1.54, event.OutCurrent, testEpsilon, "OutCurrent conversion failed")
-	assert.InEpsilon(t, 50.025510204081634, event.OutFrequency, testEpsilon, "OutFrequency conversion failed")
-	assert.InEpsilon(t, 1, event.ChargeState, testEpsilon, "ChargeState conversion failed")
 }
 
 func Test_mk2Ser_scaleDecode(t *testing.T) {
@@ -116,16 +216,16 @@ func Test_mk2Ser_scaleDecode(t *testing.T) {
 	}{
 		{
 			name:  "Valid scale",
-			frame: []byte{0x57, 0x8e, 0x9c, 0x7f, 0x8f, 0x00, 0x00, 0x6a},
+			frame: []byte{0x8e, 0x9c, 0x7f, 0x8f, 0x01, 0x00, 0x6a},
 			expectedScaling: scaling{
-				scale:     0.00013679890560875513,
-				offset:    143,
+				scale:     0.01,
+				offset:    1,
 				supported: true,
 			},
 		},
 		{
 			name:  "Unsupported frame",
-			frame: []byte{0x57, 0x00},
+			frame: []byte{0x00},
 			expectedScaling: scaling{
 				supported: false,
 			},
@@ -141,9 +241,10 @@ func Test_mk2Ser_scaleDecode(t *testing.T) {
 			assert.Equal(t, 1, len(m.scales))
 			assert.Equal(t, 1, m.scaleCount)
 			assert.Equal(t, tt.expectedScaling.supported, m.scales[0].supported)
+			assert.Equal(t, tt.expectedScaling.signed, m.scales[0].signed)
 			if tt.expectedScaling.supported {
-				assert.InEpsilon(t, tt.expectedScaling.offset, m.scales[0].offset, testEpsilon)
-				assert.InEpsilon(t, tt.expectedScaling.scale, m.scales[0].scale, testEpsilon)
+				assert.InDelta(t, tt.expectedScaling.offset, m.scales[0].offset, testDelta)
+				assert.InDelta(t, tt.expectedScaling.scale, m.scales[0].scale, testDelta)
 			}
 		})
 	}