SY-400/A design particularly emphasizes on external devices fast-connection, such as readers, I/O, communication. This mode of connection without product disassembly is provided for quick and simple maintenance purposes. 

Two connectors for badge
readers (PRX-30,SY-10/M,
SY-10/B, reader unit) 
Connector for PRintX 
Connector for programming
display panel 
Two relays for bell, door, etc... 
Two sensors for door 
monitoring 
Large storage capacity 512K
of protected RAM 
Reliability - Protected real-time
date/time clock 
Backup battery for the memory
and real-time clock 
RS-232 and RS-485
communication 
Variable baud rate - 
1200 to 19200 bps