Structure and functions
12
Building Technologies
048_DMS_NK8237_ICC_MP4.40_A6V10316241_a_en.doc
Fire Safety & Security Products 06.2011
4 Structure and functions
The NK8237 is composed of an electronic board installed in a compact and robust
plastic box.
Note that NK8237 units with build state up to 01 are equipped with the NKM8001-
A1 mainboard and NK8237 units with build state 10 or higher are equipped with the
NKM8001-A2 mainboard.
Fig. 3 NK8237 gateway unit
4.1 NK8237 hardware
4.1.1 Front panel
The front panel of the NK8237 houses 9 LED's. The five LED's on the left side are,
from top to bottom:
Front panel LED Functions
Power (LED green) Power (hardware – controlled)
Vital functions (LED green) Software vitality (blinking)
Tamper (LED bicolour) Unit tamper:
– Red means tamper alarm (hardware controlled)
– Green means tamper disabled (from management station)
Download (LED red) NK823x network diagnostics:
– Off = Status OK
– Blinking (1 flash) = Missing identification from NS8xxx
– Blinking (2 flashes) = Not used
– Blinking (3 flashes) = Default mode ( switch settings in
section 4.1.2 below): FTP channel open
– On = Critical/hardware fault
Diagnostics (LED yellow) NK823x internal interface diagnostics:
– Off = Status OK
– Blinking (fast) = Booting operating system after restart
– Blinking (1 flash) = Missing or insufficient license
– Blinking (2 flashes) = Trouble with the I
2
C bus to I/O modules
– Blinking (3 flashes) = n/a
– Blinking (4 flashes) = Trouble with the serial/network interface
– Blinking (5 flashes) = Trouble with DLL or RCLOCK file(s)
– Blinking (6 flashes) = Modbus GW trouble:
- SW trouble.
- No communication to FS20/FS720 or
to the Modbus Master/Client.
- No NK8237 or FS20/FS720 registers
reading (Modbus Master watchdog
expired)
– On = Critical/hardware fault
Tab.1.LED functions on the front panel, left side
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