Index: dialin/ui/hd_simulator.py
===================================================================
diff -u -re0899cfdf5e6f4b6716dceb6cdf2aa51c35f62a0 -ra8510e633918aee619a1383b97ec371b2c853099
--- dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision e0899cfdf5e6f4b6716dceb6cdf2aa51c35f62a0)
+++ dialin/ui/hd_simulator.py	(.../hd_simulator.py)	(revision a8510e633918aee619a1383b97ec371b2c853099)
@@ -1797,7 +1797,7 @@
         payload += float_to_bytearray(float(heparin_dispense_rate))
         payload += unsigned_integer_to_bytearray(int(heparin_pre_stop))
         payload += float_to_bytearray(float(heparin_delivered_volume))
-        payload += unsigned_to_bytearray(int(heparin_type))
+        payload += unsigned_integer_to_bytearray(int(heparin_type))
         payload += float_to_bytearray(float(average_arterial_pressure))
         payload += float_to_bytearray(float(average_venous_pressure))
         payload += unsigned_integer_to_bytearray(int(device_id))