Note: Cable quality / length problems can be solved by using LON repeat-
ers (for example, NK8020, 542843).
For details see NK8020 product datasheet e4215.
– Physical LON addresses have to be unique in a LON-segment.
RS232
Diagnostic information about the RS232 state can be obtained from the LEDs
placed on the front panel of NK822x.
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
9.3.3 Control unit won’t respond
When adding and configuring an NK822x 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.
The ‘Local address’ must correspond with the one assigned to the subsystem
during the NK822x configuration in the NK8000 Composer tool.
9.3.4 CS6 Guarto generated a fault
When adding and configuring a CS6 node, verify that you have the correct ‘Sub-
net’, ‘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.
9.3.5 No fault generated by network failure – MP3.15 and higher
If you don’t receive a fault from an NK822x when a network failure has occurred, or
if there is a long delay before you receive the fault, decrease the ‘Timer for Micro
Interruptions Threshold’ communication parameter.
Note: Default value is 30 sec.
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