diff --git a/datatypes.go b/datatypes.go
index 2df3f60..c3b7752 100644
--- a/datatypes.go
+++ b/datatypes.go
@@ -15,7 +15,7 @@ import (
 
 // float2-4 => [2]float - [4]float
 
-var placementRegexp = regexp.MustCompile(`^\(([0-9.]+|&[0-9a-f]+), ([0-9.]+|&[0-9a-f]+), ([0-9.]+|&[0-9a-f]+)\) \(([0-9.]+|&[0-9a-f]+); ([0-9.]+|&[0-9a-f]+), ([0-9.]+|&[0-9a-f]+), ([0-9.]+|&[0-9a-f]+)\)$`)
+var placementRegexp = regexp.MustCompile(`^\(([0-9.-]+|&[0-9a-f]+), ([0-9.-]+|&[0-9a-f]+), ([0-9.-]+|&[0-9a-f]+)\) \(([0-9.-]+|&[0-9a-f]+); ([0-9.-]+|&[0-9a-f]+), ([0-9.-]+|&[0-9a-f]+), ([0-9.-]+|&[0-9a-f]+)\)$`)
 
 // Placement contains 7 floats: (x, y, z) (w; x, y, z)
 type Placement [7]float32
diff --git a/genericUnmarshaller.go b/genericUnmarshaller.go
index a6372f8..46ab90b 100644
--- a/genericUnmarshaller.go
+++ b/genericUnmarshaller.go
@@ -113,7 +113,7 @@ func genericUnmarshal(in []byte, out interface{}, unit *Unit) error {
 				switch typeField.Type.Len() {
 
 				case 3:
-					grps := regexp.MustCompile(`^\(([0-9.]+|&[0-9a-f]+), ([0-9.]+|&[0-9a-f]+), ([0-9.]+|&[0-9a-f]+)\)$`).
+					grps := regexp.MustCompile(`^\(([0-9.-]+|&[0-9a-f]+), ([0-9.-]+|&[0-9a-f]+), ([0-9.-]+|&[0-9a-f]+)\)$`).
 						FindSubmatch(getSingleValue(in, attributeName))
 					var v [3]float32
 
diff --git a/helpers.go b/helpers.go
index da4d48c..83d530d 100644
--- a/helpers.go
+++ b/helpers.go
@@ -17,7 +17,7 @@ func float2sii(f float32) ([]byte, error) {
 		err error
 	)
 
-	if math.Floor(float64(f)) == float64(f) && f < 1000 {
+	if math.Floor(float64(f)) == float64(f) && f < 1000 && f > -1000 {
 		return []byte(fmt.Sprintf("%.0f", f)), nil
 	}