PULSAR MEASUREMENT 
 
181 
 
HART 
Ultra 4 HART modem supports isolated (i.e. floating) single and multi-drop 
connections, thereby permitting active or passive modes. Terminal 
connections, communicating to software such as PACTware are shown as 
below:  
Active Mode 1 (Using Ultra 4 internal supply):  
 
 
Active Mode 2 (Connected to self-powered device):