2-8 
The received radar video signal, transmission timing signal, and antenna rotation signal 
are sent to the display system.    The radar video signal is a non-processed, log-compressed 
signal.    The antenna rotation signal is an incremental signal, and 2048 rotation pulses and 
reference bearing pulses per cycle are used. 
 
When a specified time has passed during the stopping of the communication signal from 
the display system, the interface circuit moves into the protection mode, and forcibly stops 
the transmission and the scanner unit.