Siemens NK8235

Structure and functions
4
NK822x hardware
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Building Technologies A6V10062437_a_en
Fire Safety & Security Products 30.06.2013
4 Structure and functions
4.1 NK822x hardware
The NK822x is composed of an electronic board (with optional plug-ins) installed in a
compact and robust plastic box.
NK822x Ethernet port (NK8223 in this example)
4.1.1 Front panel
The front panel houses 9 LED’s.
Left Side LED’s
The five LED’s on the left side are, from top to bottom:
Power (LED green)
Power (hardware – controlled).
Vital functions (LED green)
Software vitality:
 Blinking (1 flash) : core software running.
Tamper (LED bicolour)
Unit tamper:
 Red means tamper alarm (hardware controlled).
 Green means tamper disabled (from management station).
Download (LED red)
Network diagnostics:
 Off : status OK.
 Blinking (1 flash) : missing identification from NS8xxx.
 Blinking (2 flashes) : not used.
 Blinking (3 flashes) : FTP channel open (default mode; for switch settings see
Internal DIP Switches .
 On : critical/hardware fault.