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Structure and functions
NK823x hardware
4
25
Building Technologies
A6V10062437_a_en
Fire Safety & Security Products
30.06.2013
NK823x Ethernet port unit (NK8235 in this example)
4.2.1
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.
Blinking (2 flash): core software running and logging function active.
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.
Diagnostics (LED yellow)
Internal interface diagnostics:
Off: status OK.
Blinking (fast): booting operating system after restart.
Blinking (1 flash): missing or insufficient license.