The system may also include a contact closure interface having inputs for {HEAD ~ connection} of an alternate device or control system to {TAIL ~ the contact closure interface} for generating command signals for controlling one or more of the drive units 
to
The system may also include a contact closure interface having inputs for { HEAD ~ connection } of an alternate device or control system to { TAIL ~ the contact closure interface } for generating command signals for controlling one or more of the drive units
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH