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What can cause the ATS46 soft starter to trip on a serial link or SLF fault?

Issue:
What can cause the ATS46 soft starter to trip on a serial link or SLF fault?

Product Line:
ATS46 with remote HMI or RS232 option

Environment:
All 

Cause:
SLF= serial link fault from a network or modbus connection time out. 

Resolution:
In LINK mode, messages must be sent to the controller regularly (at least
one message every 10 seconds with UNI-TELWAY, MODBUS ASCII, and
MODBUS RTU protocol and every second in ASCII protocol). If a
message is not received, a controller serial link fault (SLF) occurs. The
communication check can be inhibited by setting bit NTO to 1, which
prevents the SLF fault from displaying. This is useful in setup and
troubleshooting; however, NTO should be set to 0 for normal serial link
command operation.
 
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