diff --git a/Sharp7.Rx/Sharp7Connector.cs b/Sharp7.Rx/Sharp7Connector.cs
index 8a648c7..c9eba40 100644
--- a/Sharp7.Rx/Sharp7Connector.cs
+++ b/Sharp7.Rx/Sharp7Connector.cs
@@ -222,7 +222,8 @@ namespace Sharp7.Rx
             if (result != 0)
             {
                 await EvaluateErrorCode(result);
-                throw new InvalidOperationException($"Error reading {operand}{dBNr}:{startByteAddress}->{bytesToRead}");
+                var errorText = this.sharp7.ErrorText(result);
+                throw new InvalidOperationException($"Error reading {operand}{dBNr}:{startByteAddress}->{bytesToRead} ({errorText})");
             }
 
             var retBuffer = new byte[bytesToRead];