Modbus TCP exceptions in lookout

[jpss]

Why Lookout doesn't warn when an exception comes up in MODBUS TCP?
I know that Modbus TCP specification says that if there is a correct response, even though it's an exception, it's everything ok, but i think it's necessary to know it.

[Vineet_A.]

Hello,

It's true that since the message was understandable, it's technically not a communications error, but you can still monitor the number of exceptions that have occurred using the "Exceptions" data member. This number can also be reset to zero using the "ResetCounts" data member.

Regards,
Vineet A.
Applications Engineer
National Instruments

[jpss]

That might be right if Lookout really notices there is an exception, but it doesn't. I have been logging lookout's ethernet activity while sending exceptions, (attached files, I couldn't change numeric format in log file).

It doesn't happen in 232/485.

JPSS