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4
Structure and functions
NK8237 hardware
18
Building Technologies
A6V10854379_a_en
CPS Fire Safety
30.11.2017
Diagnostics (yellow LED)
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): not used
Blinking (4 flashes): trouble with the serial/network interface.
Blinking (5 flashes): trouble with DLL or RCLOCK file(s).
Blinking (6 flashes): IEC GW trouble.
– SW trouble.
– No communication to FS20/FS720 or to the IEC Master.
On: critical/hardware fault.
Right Side LEDs
The four LEDs on the right side are, from top to bottom:
Name
Function
Com1
Status Com1
Red: RX
Green: TX
Com2
Status Com2
Com3 (not used)
Status Com3
Com4 (not used)
Status Com4
6.1.2
Internal DIP switches
The internal DIP switches (S101) enable a download session via FTP using a
default IP address and the NK823x Web Server.
Internal switch
Functions
DIP switch 1
Default mode/network access: If DIP switch 1 is ON, a Secure Download
connection occurs by default on the Ethernet 1 at the default IP address
192.168.9.41 and the NK823x Web Server is enabled.
DIP switch 2
Default mode/network access: If DIP switch 2 is ON, a Secure Download
connection occurs by default on the Ethernet 2 at the default IP address
192.168.10.41 and the NK823x Web Server is enabled.
DIP switch 1 and 2
Default mode/network access: If DIP switch 1 and 2 are ON, the passwords
of the NK823x Web Server are set back to the default values.