diff --git a/hpcs6500.py b/hpcs6500.py
index 02f9fa5..242cedf 100644
--- a/hpcs6500.py
+++ b/hpcs6500.py
@@ -841,8 +841,10 @@ def main():
 
             if args.passive:
                 result = dev.read_current()
-            else:
+            elif args.continuous:
                 result = dev.take_reading(psu=False)
+            else:
+                result = dev.take_single_reading()
 
             if result is None:
                 print("Failed to get reading")