3 Structure and functions
3.1 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)
3.1.1 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 bicolor)
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 (1 flash)
: missing or insufficient license.
⚫
Blinking (2 flashes)
: trouble with the I
2
C bus to I/O modules.
⚫
Blinking (3 flashes)
: trouble with the LON interface.
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