Added a check to ensure that pulse guide commands fail when the scope is slewing or already being moved on the same axes.

Meade.net.Telescope.UnitTests/TelescopeUnitTests.cs

@@ -1322,6 +1322,40 @@ namespace Meade.net.Telescope.UnitTests
             _utilMock.Verify( x => x.WaitForMilliseconds(duration), Times.Once);
         }
 
+        [TestCase(GuideDirections.guideEast)]
+        [TestCase(GuideDirections.guideWest)]
+        [TestCase(GuideDirections.guideNorth)]
+        [TestCase(GuideDirections.guideSouth)]
+        public void PulseGuide_WhenSlewingAndPulseGuideAttempted_ThenThrowsExpectedException(GuideDirections direction)
+        {
+            _sharedResourcesWrapperMock.Setup(x => x.SendString("#:D#")).Returns("|");
+
+            var duration = 0;
+            ConnectTelescope();
+
+            var exception = Assert.Throws<InvalidOperationException>(() => { _telescope.PulseGuide(direction, duration); });
+
+            Assert.That(exception.Message, Is.EqualTo("Unable to PulseGuide whilst slewing to target."));
+        }
+
+        [TestCase(GuideDirections.guideEast, TelescopeAxes.axisPrimary)]
+        [TestCase(GuideDirections.guideWest, TelescopeAxes.axisPrimary)]
+        [TestCase(GuideDirections.guideNorth, TelescopeAxes.axisSecondary)]
+        [TestCase(GuideDirections.guideSouth, TelescopeAxes.axisSecondary)]
+        public void PulseGuide_WhenMovingAxisAndPulseGuideAttempted_ThenThrowsExpectedException(GuideDirections direction, TelescopeAxes axes)
+        {
+            _sharedResourcesWrapperMock.Setup(x => x.SendString("#:D#")).Returns("");
+
+            var duration = 0;
+            ConnectTelescope();
+
+            _telescope.MoveAxis(axes, 1);
+
+            var exception = Assert.Throws<InvalidOperationException>(() => { _telescope.PulseGuide(direction, duration); });
+
+            Assert.That(exception.Message, Is.EqualTo("Unable to PulseGuide while moving same axis."));
+        }
+
         [TestCase(GuideDirections.guideEast)]
         [TestCase(GuideDirections.guideWest)]
         [TestCase(GuideDirections.guideNorth)]

Meade.net.Telescope/Telescope.cs

@@ -1415,6 +1415,15 @@ namespace ASCOM.Meade.net
             LogMessage("PulseGuide", $"pulse guide direction {direction} duration {duration}");
             CheckConnected("PulseGuide");
 
+            if (IsSlewingToTarget())
+                throw new InvalidOperationException("Unable to PulseGuide whilst slewing to target.");
+
+            if (_movingPrimary && (direction == GuideDirections.guideEast || direction == GuideDirections.guideWest))
+                throw new InvalidOperationException("Unable to PulseGuide while moving same axis.");
+
+            if (_movingSecondary && (direction == GuideDirections.guideNorth || direction == GuideDirections.guideSouth))
+                throw new InvalidOperationException("Unable to PulseGuide while moving same axis.");
+
             var coordinatesBeforeMove = GetTelescopeRaAndDec();
 
             if (_userNewerPulseGuiding && duration < 10000)
@@ -1928,6 +1937,12 @@ namespace ASCOM.Meade.net
                 if (MovingAxis())
                     return true;
 
+                return IsSlewingToTarget();
+            }
+        }
+
+        private bool IsSlewingToTarget()
+        {
             CheckConnected("Slewing Get");
 
             var result = _sharedResourcesWrapper.SendString("#:D#");
@@ -1946,7 +1961,6 @@ namespace ASCOM.Meade.net
             LogMessage("Slewing Get", $"Result = {isSlewing}");
             return isSlewing;
         }
-        }
 
         public void SyncToAltAz(double azimuth, double altitude)
         {