Siemens NK8222

Maintenance and diagnostics
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Building Technologies 048_DMS_NK8000_ICC_MP4.40_A6V10062437_a_en.doc
Fire Safety & Security Products 06.2011
 Note: Cable quality / length problems can be solved by using LON repeaters
 RS232
Diagnostic information about the RS232 state can be obtained from the LEDs
placed on the front panel of NK82xx.
Typical problems of RS232 communication are:
 Mix of RXD / TXD lines
 Line length exceeds the maximum of 15m
 Disturbances, caused by ground loops
Solve problems of exceeding line length by using:
 RS232 line drivers
 Fibre optic converters
 RS422 converters
10.5.3 Control unit won’t respond
When adding and configuring an NK82xx node, verify that you have the correct
Local address and Baud rate, and that the data link is up (blinking red and
green). If you have an incorrect Local address or Baud rate, you will no commu-
nication in run-time, though no error message will be generated.
i
The Local address must correspond with the one assigned to the subsystem
during the NK82xx configuration in the NK8000 Composer tool.
10.5.4 CS6 Guarto generated a fault
When adding and configuring a CS6 node, verify that you have the correct Subnet,
Node, and Logical address. Ensure that the LON Physical address matches
what is physically on the rotary switches of the Guarto LON-adapter board K3I070.
Note: The LON Physical address: Subnet 01. Node 02 and the BACnet Logical
Address 1 are reserved for the NK822x itself and must not be used for the Guarto.
Check if the BACnet Logical Address for the management station in the CS6
Guarto configuration is set to 1 (To be checked with the CS6 tool SWE6 for Guarto
in node CerCom Bus, properties of node Management Station).
Note: If these settings are incorrect, you will have no communication in run-time,
though no error message will be generated.
10.5.5 No fault generated by network failure – MP3.15 and higher
If you do not receive a fault from an NK82xx when a network failure has occurred,
or if there is a long delay before you receive the fault, decrease the Timer for Mi-
cro Interruptions Threshold communication parameter.
Note: Default value is 0 sec.